Olena Okhay (951B-95CB-0118)

Curriculum Vitae

Olena Okhay

Olena Okhay obtained her PhD in Materials Science and Engineering in November 2009. She won several post-doc fellows in University of Aveiro, Portugal. Her main scientific interests during PhD degree were: i) processing and characterization of ferroelectric films and ceramics; ii) structure, microstructure, dielectric, piezoelectric, magnetic properties of ferroelectrics and related materials. Her post-doc activities focused on the materials for energy harvesting and storage such as thermoelectrics, piezoelectrics, as well as materials for solar cells and electrochemical capacitors (called as supercapacitors). Her current work concentrated on 1D-2D carbon-family materials, different composites, including metal oxides/hydroxide, polymers, etc. She obtained 1st prize in XXXIX Meeting of the Portuguese Society for Microscopy and Cell Biology (2004) and Young Scientist Award in European Materials Research Society (E-MRS) 2008 Spring Meeting. She participated in COST actions, FAME international networks, Graphene Flagship-events as well as in many summer/winter schools and workshops on different scientific thematic for the improving of her personal research potential. Her two short time project were supported byEuropean Cooperation in Science and Technology (COST) as short time scientific missions (STSM) in Institute of Physics, Academy of Science of Czech Republic (2004 and 2007) and one STSM to Institute of Advanced Technologies for Energy Nicola Giordano (CNR - ITAE) of Messina, Italy (2019). Another two scientific visits to Tampere University, Finland (2019) and to Kaunas University of Technology, Lithuania (2022) were awarded as Research Mobility Grant from The European Consortium of Innovative Universities (ECIU). In addition, she has collaborations with Forschungzentrum Jülich, Universität Duisburg-Essen, University of Mainz, University of Stuttgart (all in Germany) and with University of Warsaw (Poland). Also, she has many co-authors in Portugal from IFIMUP-IN-University of Porto and CMEMS-University of Minho as well as in University of Aveiro. Such collaborations result to published 38 papers and 3 book chapters. She is Reviewer in 17 International Journals. She participated in International conferences with posters (about 30) and oral presentations (3 invited/keynotes talks) as well as member of the organizing committee.

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Identificação

Identificação pessoal

Nome completo: Olena Okhay

Identificadores de autor

Ciência ID: 951B-95CB-0118
ORCID iD: 0000-0002-0885-7127
Researcher Id: A-2940-2017
Scopus Author Id: 16744029100

Endereços de correio eletrónico

olena@ua.pt (Profissional)

Moradas

Universidade de Aveiro, Departamento de Engenharia Mecânica, Centro de Tecnologia Mecânica e Automação - TEMA. Campus Universitario de Santiago (CP:Aveiro), 3810-193, Aveiro, Aveiro, Portugal (Profissional)

Domínios de atuação

Ciências da Engenharia e Tecnologias - Nanotecnologia
Ciências da Engenharia e Tecnologias - Engenharia do Ambiente - Engenharia Ambiental
Ciências da Engenharia e Tecnologias - Engenharia do Ambiente
Ciências da Engenharia e Tecnologias - Engenharia dos Materiais - Engenharia dos Materiais
Ciências da Engenharia e Tecnologias - Engenharia dos Materiais - Compósitos
Ciências da Engenharia e Tecnologias - Engenharia dos Materiais - Revestimentos e Filmes
Ciências da Engenharia e Tecnologias - Engenharia dos Materiais - Têxteis
Ciências Naturais - Ciências da Terra e do Ambiente - Ciências do Ambiente

Idiomas

Idioma	Conversação	Leitura	Escrita	Compreensão
Ucraniano (Idioma materno)
Russo (Idioma materno)
Inglês	Utilizador independente (B1)	Utilizador independente (B1)	Utilizador independente (B1)	Utilizador independente (B1)
Alemão	Utilizador elementar (A1)	Utilizador elementar (A1)	Utilizador elementar (A1)	Utilizador elementar (A1)
Português	Utilizador elementar (A2)	Utilizador independente (B1)	Utilizador elementar (A2)	Utilizador independente (B1)

Formação

	Grau	Classificação
2009/11/11 Concluído	Ciência e Engenharia de Materiais / Materials Science and Engineering (Doutoramento) Especialização em Sem especialidade Universidade de Aveiro, Portugal "Filmes À Base de Srtio3 para Aplicações em Dispositivos Sintonizáveis / Strontium titanate based films for tunable device applications" (TESE/DISSERTAÇÃO)
1999 Concluído	Microelectronic and semiconductor devices (Master) National Technical University of Ukraine "Kyiv Polytechnic Institute" (NTUU "KPI"), Ucrânia "Research of the inverse (explosive) lithography method for films of high-temperature superconductors" (TESE/DISSERTAÇÃO)	excellent
1997 Concluído	Electronics (Bachelor) National Technical University of Ukraine "Kyiv Polytechnic Institute" (NTUU "KPI"), Ucrânia	excellent

Percurso profissional

Ciência

	Categoria Profissional Instituição de acolhimento	Empregador
2019/01/31 - Atual	Investigador Contratado (Investigação)	Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal
	Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal
2018/03/01 - 2019/01/30	Pós-doutorado (Investigação)	Universidade de Aveiro CICECO, Portugal
	Universidade de Aveiro, Portugal
2018/01/01 - 2018/02/28	Pós-doutorado (Investigação)	Universidade de Aveiro CICECO, Portugal
	Universidade de Aveiro, Portugal
2012/01 - 2017/12	Pós-doutorado (Investigação)	Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal

Outros

	Categoria Profissional Instituição de acolhimento	Empregador
2003/04 - 2008/12	PhD student (PhD student)	Universidade de Aveiro, Portugal
	Universidade de Aveiro, Portugal
2000/11 - 2003/02	Researcher (Researcher)	Research institute of social-economic problem of Kyiv, Ucrânia
	Research institute of social-economic problem of Kyiv, Ucrânia
1999/03 - 2000/11	Researcher (Researcher)	Research centre, Kyiv, Ucrânia
	Research centre, Ucrânia
1993/09 - 1999/03	student	National Technical University of Ukraine "Kyiv Polytechnic Institute" (NTUU "KPI"), Ucrânia

1989/09 - 1993/07	student	Kyiv Optical and Mechanical College, Ucrânia

Projetos

Bolsa

	Designação	Financiadores
2022/10 - 2022/10	Development and characterization of composite electrodes based on porous graphene materials for energy storage devices E-COST-GRANT-CA20126-564bd979 Grant Uniwersytet Jagiellonski w Krakowie, Polónia	Concluído
2022/08 - 2022/08	Development and electrochemical characterization of the electrode materials based on graphene n/a Outra Kauno technologijos universitetas, Lituânia	The European Consortium of Innovative Universities Concluído
2019/07 - 2019/07	Graphene based electrodes for symmetric supercapacitors n//a Outra University of Tampere - Faculty of Medicine and Health Technology (MET), Finlândia	The European Consortium of Innovative Universities Concluído
2019 - 2019	Graphene-based electrode for symmetric supercapacitors STSM ECOST-STSM-CA15107- 44419 Investigador responsável Institute of Advanced Technologies for Energy “Nicola Giordano” (CNR - ITAE) of Messina, Itália	European Cooperation in Science and Technology Concluído
2015/01/01 - 2017/12/31	Ni doped carbon-based materials for sensor application SFRH /BPD /77704 / 2011 Investigador Pós-doutorado Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2012/01/01 - 2014/12/31	New thin films solar cells based on graphene oxide modified by Ni quantum dots SFRH/BPD/77704/2011 Bolseiro de Pós-Doutoramento Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2005/01/01 - 2008/12/31	Strontium titanate based films for tunable device applications SFRH/BD/13863/2003 Bolseiro de Doutoramento Universidade de Aveiro CICECO, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2007 - 2007	Structural analyses of doped SrTiO3 thin films COST-STSM-539-1258 Investigador Institute of Physics, Academy of Science of the Czech Republic , República Checa	European Cooperation in Science and Technology Concluído
2005 - 2005	Structural properties of incipient ferroelectric films COST-STSM-525-00601 Investigador Institute of Physics, Academy of Science of the Czech Republic , República Checa	European Cooperation in Science and Technology Concluído
2003/10 - 2004	Preparation and characterization of thin films of incipient ferroelectrics POCTI/CTM/44732/2002 Outra Universidade de Aveiro, Portugal	Universidade de Aveiro Concluído

Projeto

	Designação	Financiadores
2019/01/31 - Atual	Graphene-based materials for energy harvesting and storage devices "Decree-Law 57/2016" Investigador Universidade de Aveiro, Portugal	Fundação para a Ciência e a Tecnologia Em curso
2019/01/31 - Atual	Graphene-based materials for energy harvesting and storage devices "Decree-Law 57/2016" researcher Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Em curso
2022/01/01 - 2024/12/31	Power Phoenix Battery-A Full Solid State Grid-scale Storage Solution PTDC/EME-REN/1497/2021 Investigador Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Em curso
2018/03 - 2019/01	SGH - SMART GREEN HOMES POCI-01-0247-FEDER-007678 Bolseiro de Pós-Doutoramento Universidade de Aveiro CICECO, Portugal	European Regional Development Fund Fundação para a Ciência e a Tecnologia Concluído
2005/01/01 - 2008/12/31	STUDIES ON SRTIO3 BASED THIN FILMS PREPARED BY SOL-GEL FOR MICROELECTRONIC APPLICATIONS SFRH/BD/19861/2004 Universidade de Aveiro, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2004 - 2004	Thick composite films for piezoelectric devices POCTI/CTM/44732/2002 Outra Universidade de Aveiro, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2003 - 2004	Development of tunable capacitors for applications at microwave frequencies SAPIENS99 35542/99 Outra Universidade de Aveiro, Portugal	Fundação para a Ciência e a Tecnologia Concluído

Outro

	Designação	Financiadores
2013 - 2014	Funding of Strategic Projects with Public Interest promoted by Associated Laboratories and RD Units PEst-C/EME/UI0481/2013 Outra Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Fundação para a Ciência e a Tecnologia
2011/01 - 2012/01	Development of computational and physical tools to enhance the effectiveness of products and processes UI 481 - 2011-2012 Outra Universidade de Aveiro Centro de Tecnologia Mecânica e Automação, Portugal	Fundação para a Ciência e a Tecnologia Concluído
2008/08 - 2008/08	Financial grant for participation to 9th European Conference on Application of Polar Dielectrics (ECAPD9) na Outra	Fundação Calouste Gulbenkian Concluído
2004 - 2008	FAME - Functionalised advanced materials engineering of hybrids and ceramics FP6-2002-NMP-1500159 Outra Universidade de Aveiro, Portugal	European Commission Concluído

Produções

Publicações

Artigo em revista	Okhay, Olena; Tkach, Alexander. "A comprehensive review of the use of porous graphene frameworks for various types of rechargeable lithium batteries". Journal of Energy Storage 80 (2024): 110336. http://dx.doi.org/10.1016/j.est.2023.110336. Acesso aberto • Publicado • 10.1016/j.est.2023.110336 Alexander Tkach; Olena Okhay. "Ceramics and Nanostructures for Energy Harvesting and Storage". Nanomaterials (2023): https://doi.org/10.3390/nano13222912. 10.3390/nano13222912 Vitalii Vashchynskyi; Olena Okhay; Tetiana Boychuk. "Chemical Activation of Apricot Pit-Derived Carbon Sorbents for the Effective Removal of Dyes in Environmental Remediation". C (2023): https://doi.org/10.3390/c9040093. 10.3390/c9040093 Olena Okhay; Alexander Tkach. "Current Achievements in Flexible Piezoelectric Nanogenerators Based on Barium Titanate". Nanomaterials (2023): https://doi.org/10.3390/nano13060988. 10.3390/nano13060988 Olena Okhay; Paula M. Vilarinho; Alexander Tkach. "Structure, Microstructure, and Dielectric Response of Polycrystalline Sr1-xZnxTiO3 Thin Films". Coatings (2023): https://doi.org/10.3390/coatings13010165. 10.3390/coatings13010165 Tkach, Alexander; Okhay, Olena. "Comment on “Enhancing the output performance of hybrid nanogenerators based on Al-doped BaTiO₃ composite films: a self-powered utility system for portable electronics”, by B. Dudem, L. K. Bharat, H. Patnam, A. R. Mule and J. S. Yu, J. Mater. Chem. A, 2018, 6, 16101". Journal of Materials Chemistry A 11 46 (2023): 25756-25758. http://dx.doi.org/10.1039/d3ta01041d. Publicado • 10.1039/d3ta01041d Olena Okhay; Alexander Tkach. "Polyaniline—Graphene Electrodes Prepared by Electropolymerization for High-Performance Capacitive Electrodes: A Brief Review". Batteries (2022): https://doi.org/10.3390/batteries8100191. 10.3390/batteries8100191 Olena Okhay; Alexander Tkach. "Synergetic Effect of Polyaniline and Graphene in Their Composite Supercapacitor Electrodes: Impact of Components and Parameters of Chemical Oxidative Polymerization". Nanomaterials (2022): https://doi.org/10.3390/nano12152531. 10.3390/nano12152531 Olena Okhay; Alexandre Cunha Bastos; Kateryna Andreeva; Sampo Tuukkanen; Alexander Tkach. "Reduced Graphene Oxide—Polycarbonate Electrodes on Different Supports for Symmetric Supercapacitors". C (2022): https://doi.org/10.3390/c8010012. 10.3390/c8010012 Olena Okhay; Paula M. Vilarinho; Alexander Tkach. "Low-Temperature Dielectric Response of Strontium Titanate Thin Films Manipulated by Zn Doping". Materials 15 3 (2022): 859-859. https://doi.org/10.3390/ma15030859. 10.3390/ma15030859 Alexander Tkach; Olena Okhay; Dmitry Nuzhnyy; Jan Petzelt; Paula M. Vilarinho. "Polar Phonon Behaviour in Polycrystalline Bi-Doped Strontium Titanate Thin Films". Materials (2021): https://www.mdpi.com/1996-1944/14/21/6414. 10.3390/ma14216414 Olena Okhay; Alexander Tkach. "Graphene/Reduced Graphene Oxide-Carbon Nanotubes Composite Electrodes: From Capacitive to Battery-Type Behaviour". Nanomaterials (2021): https://www.mdpi.com/2079-4991/11/5/1240. 10.3390/nano11051240 Olena Okhay; Alexander Tkach. "Impact of Graphene or Reduced Graphene Oxide on Performance of Thermoelectric Composites". C (2021): https://www.mdpi.com/2311-5629/7/2/37. 10.3390/c7020037 Tkach, Alexander; Okhay, Olena. "Comment on “Hole-pinned defect-dipoles induced colossal permittivity in Bi doped SrTiO3 ceramics with Sr deficiency”". Journal of Materials Science & Technology 65 (2021): 151-153. http://dx.doi.org/10.1016/j.jmst.2020.05.064. Publicado • 10.1016/j.jmst.2020.05.064 Tkach, Alexander; Okhay, Olena. "Comment on “Point defect structure of La-doped SrTiO3 ceramics with colossal permittivity”". Scripta Materialia 190 (2021): 38-39. http://dx.doi.org/10.1016/j.scriptamat.2020.08.032. Publicado • 10.1016/j.scriptamat.2020.08.032 Okhay, Olena; Tkach, Alexander; Gallo, Maria J. Hortiguela; Otero-Irurueta, Gonzalo; Mikhalev, Sergey; Staiti, Pietro; Lufrano, Francesco. "Energy storage of supercapacitor electrodes on carbon cloth enhanced by graphene oxide aerogel reducing conditions". Journal of Energy Storage 32 (2020): 101839. http://dx.doi.org/10.1016/j.est.2020.101839. Publicado • 10.1016/j.est.2020.101839 Okhay, Olena; Tkach, Alexander; Staiti, Pietro; Lufrano, Francesco. "Long term durability of solid-state supercapacitor based on reduced graphene oxide aerogel and carbon nanotubes composite electrodes". Electrochimica Acta 353 (2020): 136540. http://dx.doi.org/10.1016/j.electacta.2020.136540. Publicado • 10.1016/j.electacta.2020.136540 Tkach, Alexander; Okhay, Olena. "Comment on “Giant dielectric response in (Nb + Zn) co-doped strontium titanate ceramics tailored by atmosphere”". Scripta Materialia 185 (2020): 19-20. http://dx.doi.org/10.1016/j.scriptamat.2020.04.003. Publicado • 10.1016/j.scriptamat.2020.04.003 A.Tkach; A.Santos; S.Zlotnik; R.Serrazina; O.Okhay; I.Bdikin; M.E.Costa; P.M.Vilarinho. "Effect of Solution Conditions on the Properties of Sol–Gel Derived Potassium Sodium Niobate Thin Films on Platinized Sapphire Substrates". Nanomaterials 9 11 (2019): 1600. http://dx.doi.org/10.3390/nano9111600. Publicado • 10.3390/nano9111600 O.Okhay; G.Gonçalves; C.Dias; J.Ventura; E.M.F.Vieira; L.M.V.Gonçalves; A.Tkach. "Tuning electrical and thermoelectric properties of freestanding graphene oxide papers by carbon nanotubes and heat treatment". Journal of Alloys and Compounds 781 (2019): 196-200. http://dx.doi.org/10.1016/j.jallcom.2018.12.033. Publicado • 10.1016/j.jallcom.2018.12.033 O.Okhay; S.Zlotnik; W.Xie; K.Orlinski; M.J.Hortiguela Gallo; G.Otero-Irurueta; A.J.S.Fernandes; et al. "Thermoelectric performance of Nb-doped SrTiO3 enhanced by reduced graphene oxide and Sr deficiency cooperation". Carbon 143 (2019): 215-222. http://dx.doi.org/10.1016/j.carbon.2018.11.023. Publicado • 10.1016/j.carbon.2018.11.023 A.Tkach; A.Santos; S.Zlotnik; R.Serrazina; O.Okhay; I.Bdikin; M.E.Costa; P.M.Vilarinho. "Strain-Mediated Substrate Effect on the Dielectric and Ferroelectric Response of Potassium Sodium Niobate Thin Films". Coatings 8 12 (2018): 449. http://dx.doi.org/10.3390/coatings8120449. Acesso aberto • Publicado • 10.3390/coatings8120449 A.Tkach; J.Resende; K.V.Saravanan; M.E.Costa; P.Diaz-Chao; E.Guilmeau; O.Okhay; P.M.Vilarinho. "Abnormal Grain Growth as a Method To Enhance the Thermoelectric Performance of Nb-Doped Strontium Titanate Ceramics". ACS Sustainable Chemistry & Engineering 6 12 (2018): 15988-15994. http://dx.doi.org/10.1021/acssuschemeng.8b03875. Publicado • 10.1021/acssuschemeng.8b03875 O. Okhay; A.Tkach; D.Nuzhnyy; J. Petzelt; P.M.Vilarinho. "Polar phonons in polycrystalline SrTiO3 thin films: The role of the substrate". Ferroelectrics 532 1 (2018): 89-99. http://dx.doi.org/10.1080/00150193.2018.1499407. Publicado • 10.1080/00150193.2018.1499407 A.Tkach; O.Okhay; I.M. Reaney; P.M.Vilarinho. "Mechanical strain engineering of dielectric tunability in polycrystalline SrTiO3 thin films". Journal of Materials Chemistry C 6 10 (2018): 2467-2475. http://dx.doi.org/10.1039/c8tc00414e. Publicado • 10.1039/c8tc00414e A.Tkach; O.Okhay; A. Almeida; P.M.Vilarinho. "Giant dielectric permittivity and high tunability in Y-doped SrTiO3 ceramics tailored by sintering atmosphere". Acta Materialia 130 (2017): 249-260. http://dx.doi.org/10.1016/j.actamat.2017.03.051. Publicado • 10.1016/j.actamat.2017.03.051 O.Okhay; G.Gonçalves; A.Tkach; C.Dias; J.Ventura; M.F.Ribeiro da Silva; L.M.Valente Gonçalves; E.Titus. "Thin film versus paper-like reduced graphene oxide: Comparative study of structural, electrical, and thermoelectrical properties". Journal of Applied Physics 120 5 (2016): 051706. http://dx.doi.org/10.1063/1.4958956. Publicado • 10.1063/1.4958956 O.Okhay; R. Krishna; A.Tkach; M.Kläui; L.M.Guerra; J.Ventura; E.Titus; J.Gracio. "Drastic modification of graphene oxide properties by incorporation of nickel: a simple inorganic chemistry approach". Journal of Materials Science 50 9 (2015): 3425-3433. http://dx.doi.org/10.1007/s10853-015-8901-8. Publicado • 10.1007/s10853-015-8901-8 O.Okhay; R. Krishna; E.Titus; K.Andreeva; R.Savkina; O.Smirnov. "Photovoltage Study of Graphene Oxide with Ni Nanoparticles". Materials Today: Proceedings 2 1 (2015): 431-435. http://dx.doi.org/10.1016/j.matpr.2015.04.051. Publicado • 10.1016/j.matpr.2015.04.051 O.Okhay; L.M.Guerra; J.Ventura; A.Tkach; M.Kläui; R.Krishna; E.Titus. "Electrical and Magnetic Properties of Graphene Films with Ni Nanoparticles". Materials Today: Proceedings 2 1 (2015): 383-388. http://dx.doi.org/10.1016/j.matpr.2015.04.040. Publicado • 10.1016/j.matpr.2015.04.040 O.Okhay; R. Krishna; LM. Guerra; J.Ventura; E.Titus; J.Gracio. "Influence of Oxidation and Deposition Process on Electrical Properties of Graphene Films". Journal of Materials Science and Engineering B 4 10 (2014): 318-321. http://dx.doi.org/10.17265/2161-6221/2014.10.007. Publicado • 10.17265/2161-6221/2014.10.007 R. Krishna; E.Titus; O.Okhay; J.C.Gil; J.Ventura. "Rapid Electrochemical Synthesis of Hydrogenated Graphene Oxide Using Ni Nanoparticles". International Journal of Electrochemical Science 9 7 (2014): 4o54-4069. Publicado O.Okhay; A.Tkach; A.Wu; P.M.Vilarinho. "Manipulation of dielectric permittivity of sol–gel SrTiO3 films by deposition conditions". Journal of Physics D: Applied Physics 46 50 (2013): 505315. http://dx.doi.org/10.1088/0022-3727/46/50/505315. Publicado • 10.1088/0022-3727/46/50/505315 M.Salimian; O.Okhay; R. Krishna; E.Titus; J.Gracio; L.M.Guerra; J.Ventura; et al. "Electrical conductivity of LTA-zeolite in the presence of poly(vinyl alcohol) and poly(vinyl pyrrolidone) polymers". Polymer International 62 (2013): 1583-1588. http://dx.doi.org/10.1002/pi.4542. Publicado • 10.1002/pi.4542 O.Okhay; R. Krishna; M.Salimian; E.Titus; J.Gracio; L.M.Guerra; J.Ventura. "Conductivity enhancement and resistance changes in polymer films filled with reduced graphene oxide". Journal of Applied Physics 113 6 (2013): 064307. http://dx.doi.org/10.1063/1.4790608. Publicado • 10.1063/1.4790608 A.Tkach; O.Okhay; A.Wu; P.M.Vilarinho; S.Bedanta; V.V. Shvartsman; P.Borisov. "Magnetic Anomaly and Dielectric Tunability of (Sr,Mn)TiO3 Thin Films". Ferroelectrics 426 1 (2012): 274-281. http://dx.doi.org/10.1080/00150193.2012.672038. Publicado • 10.1080/00150193.2012.672038 O.Okhay; A.Wu; P.M.Vilarinho; A.Tkach. "Dielectric relaxation of Sr1–1.5xBixTiO3 sol-gel thin films". Journal of Applied Physics 109 6 (2011): 064103. http://dx.doi.org/10.1063/1.3549612. Publicado • 10.1063/1.3549612 A.Tkach; A. Almeida; J.A.Moreira; T.M.Correia; M.R.Chaves; O.Okhay; P.M.Vilarinho; I. Gregora; J. Petzelt. "Enhancement of tetragonality and role of strontium vacancies in heterovalent doped SrTiO3". Applied Physics Letters 98 5 (2011): 052903. http://dx.doi.org/10.1063/1.3549181. Publicado • 10.1063/1.3549181 A. Tkach; A. Almeida; J.A. Moreira; T. M. Correia; M.R. Chaves; O.Okhay; P.M. Vilarinho; I. Gregora; J. Petzelt. "Role of trivalent Sr-substituents and Sr-vacancies in tetragonal and polar states of SrTiO3". Acta Mater. 59 0 (2011): 5388-5397. Publicado • 10.1016/j.actamat.2011.05.011 O.Okhay; A.Wu; P.M.Vilarinho; A.Tkach. "Dielectric response of polycrystalline Sr1-1.5xBixTiO3 thin films under direct current bias". Applied Physics Letters 97 6 (2010): 062912. http://dx.doi.org/10.1063/1.3463472. Publicado • 10.1063/1.3463472 O.Okhay; A.Wu; P.M.Vilarinho; A.Tkach. "Low temperature dielectric characterization of Mg-doped SrTiO3 thin films prepared by sol-gel". Applied Physics Letters 96 15 (2010): 152906. http://dx.doi.org/10.1063/1.3360213. Publicado • 10.1063/1.3360213 A.Tkach; O.Okhay; P.M.Vilarinho; A.L. Kholkin. "High dielectric constant and tunability of strontium titanate ceramics modified by chromium doping". Journal of Physics: Condensed Matter 20 41 (2008): 415224. http://dx.doi.org/10.1088/0953-8984/20/41/415224. Publicado • 10.1088/0953-8984/20/41/415224 O.Okhay; A.Wu; P.M.Vilarinho; I.M. Reaney; A.R.L. Ramos; E.Alves; J. Petzelt; J.Pokorny. "Microstructural studies and electrical properties of Mg-doped SrTiO3 thin films". Acta Materialia 55 15 (2007): 4947-4954. http://dx.doi.org/10.1016/j.actamat.2007.05.015. Publicado • 10.1016/j.actamat.2007.05.015 V.A. Trepakov; M.E. Savinov; O.Okhay; A.Tkach; P.M.Vilarinho; A.L. Kholkin; I. Gregora; L. Jastrabik. "Dielectric permittivity and Cr3+ impurity ion probe luminescence in SrTiO3 sol–gel ceramics". Journal of the European Ceramic Society 27 13-15 (2007): 3705-3707. http://dx.doi.org/10.1016/j.jeurceramsoc.2007.02.022. Publicado • 10.1016/j.jeurceramsoc.2007.02.022 O.Okhay; V.M.X.Bergano; A.Wu; P.M.Vilarinho. "Bi Effect on the Microstructure and Dielectric Properties of SrTiO₃ Thin Films". Materials Science Forum 514-516 (2006): 245-249. http://dx.doi.org/10.4028/www.scientific.net/msf.514-516.245. Publicado • 10.4028/www.scientific.net/msf.514-516.245 O.Okhay; A.Wu; P.M.Vilarinho. "The Mg influence on the properties of SrTiO3 thin films". Journal of the European Ceramic Society 25 12 (2005): 3079-3083. http://dx.doi.org/10.1016/j.jeurceramsoc.2005.03.216. Publicado • 10.1016/j.jeurceramsoc.2005.03.216
Capítulo de livro	Okhay, Olena; Tkach, Alexander. "Metal Oxide Based Thermoelectric Materials". In Optical Properties of Metal Oxide Nanostructures, 399-430. Springer Nature Singapore, 2023. Publicado • 10.1007/978-981-99-5640-1_13 A.Tkach; O.Okhay; A.Santos; S.Zlotnik; R.Serrazina; P.M.Vilarinho; M.E.Costa. "Stain Effect on the Properties of Polar Dielectric Thin Films". In Advances in Thin Films, Nanostructured Materials, and Coatings, 331-342. Springer Singapore, 2019. 10.1007/978-981-13-6133-3_32 O.Okhay; A. Tkach; P.M. Vilarinho. "Effect of bismuth doping on the properties of strontium titanate thin films". In Strontium Titanate: Synthesis, Properties and Uses. Nova Science Publishers, Inc., USA, 2019. Publicado R. Krishna; E.Titus; M.Salimian; O.Okhay; S.Rajendran; A.Rajkumar; G.J.M.Sousa; et al. "Hydrogen Storage for Energy Application". In Hydrogen Storage. InTech, 2012. 10.5772/51238
Poster em conferência	O.Okhay; Otero-Irurueta, Gonzalo; YANG, TAO; Alexander Tkach. "Reduced graphene oxide for energy storage". Trabalho apresentado em International Conference-Workshop on Functional Nanostructured Materials 4 (FuNaM-4), September 26th-29th, 2023, Krakow, Poland, 2023. O.Okhay. "Reduced graphene oxide based symmetric supercapacitors fabricated on copper and carbon tapes". Trabalho apresentado em ANM 2021: 17th International conference on Advanced Nanomaterials, July 22-24, 2021, Aveiro, Portugal, 2021. O.Okhay et al.. "Structure, microstructure and electrical response of polycrystalline KNN thin films on platinized sapphire substrates". Trabalho apresentado em 10th International Meeting `Electroceramics for End Users X - PIEZO 2019, 2019. O.Okhay et al.. "Polar phonon behaviour in polycrystalline SrTiO3 thin films: the role of the substrate". Trabalho apresentado em 6th International Conference "Nanotechnologies and Nanomaterials" NANO-2018, 2018. O.Okhay et al.. "Thermoelectric performance of Nb-doped SrTiO3 enhanced by reduced graphene oxide and Sr deficiency cooperation". Trabalho apresentado em 21st International Conference on Solid Compounds of Transition Elements, SCTE-2018, 2018. 10.1016/j.carbon.2018.11.023 O.Okhay et al.. "Reduced Graphene Oxide -based Electrodes for the Energy Storage Devices". Trabalho apresentado em Advanced Nano Materials (ANM2017), 2017. O.Okhay et al.. "Modification of thermoelectric properties of Nb doped SrTiO3 ceramics by reduced graphene oxide". Trabalho apresentado em Materiais 2017, XVIII Portuguese Materials Society Congress, VIII International Symposium on Materials, 2017. O.Okhay et al.. "Manipulation of the power factor of reduced graphene oxide freestanding paper by temperature and addition of carbon nanotubes". Trabalho apresentado em Materiais 2017, XVIII Portuguese Materials Society Congress, VIII International Symposium on Materials, 2017. O.Okhay et al.. "New Composite of Reduced Graphene Oxide with Potassium Chloride for Thermoelectric Applications". Trabalho apresentado em 11th International Conference on Surfaces, Coatings and Nanostructured Materials (NANOSMAT 2016), 2016. O.Okhay et al.. "Manipulation of Electrical Conductivity of Graphene Oxide by Addition of Carbon Nanotubes and Heat Treatment". Trabalho apresentado em 7th International conference on Advanced Nanomaterials, 2nd International conference on Graphene Technology, 1st International conference on Spintronics Materials (ANM2016), 2016. O.Okhay et al.. "Conductive Black-paper-like Reduced Graphene Oxide Obtained by Easy Way". Trabalho apresentado em 6th International conference on Advanced nanomaterials (ANM2015), 2015. O.Okhay et al.. "Influence of oxidation and deposition process on electrical properties of graphene films". Trabalho apresentado em 5th International conference on Advanced nanomaterials (ANM2014), 2014. 10.17265/2161-6221/2014.10.007 R.Krishna; O.Okhay et al.. "Synthesis and characterization of Spiky nickel nanoparticles-decorated reduced graphene oxide". Trabalho apresentado em 5th International conference on Advanced nanomaterials (ANM2014), 2014. O.Okhay et al.. "Enhanced resistive switching capability of RGO-MnO2 nanocomposite via incorporation of extra hydroxyl groups". Trabalho apresentado em 5th International conference on Advanced nanomaterials (ANM2014), 2014. R.Krishna; O.Okhay et al.. "A new hybrid material Ni/Ni(OH)2/rGO nanocomposite for memristor application". Trabalho apresentado em 5th International conference on Advanced nanomaterials (ANM2014), 2014. M.Salimian; O.Okhay et al.. "Electrical properties of PVA (Polyvinyl alcohol)/Zeolite and PVP(PolyVinylPyrrolidone)/Zeolite composite". Trabalho apresentado em International Conference on Polymer Behavior (ICPB5), 2012. O.Okhay et al.. "Electric and Magnetic Properties of Incipient Ferroelectric Films Doped with Manganese". Trabalho apresentado em European Materials Research Society (E-MRS) Spring Meeting, 2008. O.Okhay et al.. "Lattice dynamics studies of undoped and doped SrTiO3 films". Trabalho apresentado em DyProSo XXXI - 31st International Symposium on the Dynamic Properties of Solids, 2007. O.Okhay et al.. "Low-temperature dielectric properties of Zn-doped SrTiO3 thin films prepared by sol-gel". Trabalho apresentado em International Symposium on Integrated Ferroelectrics- ISIF 2007, 2007. O.Okhay et al.. "Low temperature dielectric relaxation of Sr1-1.5xBixTiO3 sol-gel thin films". Trabalho apresentado em 10th International Conference and Exhibition of the European Ceramic Society - ECERS, 2007. O.Okhay et al.. "Stress Influence on Dielectric Properties of Polycrystalline SrTiO3 Films". Trabalho apresentado em 2007 MRS Fall Meeting, 2007. O.Okhay et al.. "Surface and interface characteristics of polycrystalline SrTiO3 films on different substrates". Trabalho apresentado em INCOMAM´07 International Conference on Microscopy and Microanalysis XLII Congress of the Portuguese Microscopy Society, 2007. O.Okhay et al.. "Stress effect on sol gel SrTiO3 films: structure, microstructure and electrical properties at room temperature". Trabalho apresentado em Electroceramics X, 2006. V.A. Trepakov; O.Okhay et al.. "Polarization response and microscopic quantum paraelectricity in SrTiO3 sol-gel ceramic". Trabalho apresentado em Electroceramics X, 2006. O.Okhay et al.. "Bi effect on the microstructure and dielectric properties of SrTiO3 thin films". Trabalho apresentado em Materiais 2005 - XII Portuguese Materials Society Meeting, III International Materials Symposium, 2005. A. Tkach; O.Okhay et al.. "SrTiO3 ceramics for tunable components: Sr-site substitution with Cr3+ and Mn2+". Trabalho apresentado em EMSG 2005, 2005. O.Okhay et al.. "Stress-influence on the Properties of Mg doped SrTiO3 Thin Films". Trabalho apresentado em 2005 MRS Fall Meeting, 2005. O.Okhay et al.. "Preparation and Characterization of Zn doped SrTiO3 thin films". Trabalho apresentado em Junior Euromat 2004, 2004. O.Okhay et al.. "Microstructural studies of Mg doped SrTiO3 films". Trabalho apresentado em XXXIX Meeting of the Portuguese Society for Microscopy and Cell Biology, 2004.

Atividades

Apresentação oral de trabalho

	Título da apresentação	Nome do evento Anfitrião (Local do evento)
2023/11/23	Thermoelectric Materials Modified by Graphene	International summit on power and energy engineering SPECTRUM conferences (Lisbon, Portugal)
2023/06/13	Reduced graphene oxide-based electrodes for energy storage devices	NANOTECH POLAND 2023 Adam Mickiewicz University in Poznan (AMU) (Poznan, Polónia)
2023/05/29	Invited talk "Aerogel materials for capacitive electrodes in energy storage devices"	European Materials Research Society (E-MRS) Spring Meeting European Materials Research Society (E-MRS) (Strasbourg, França)
2023/04/24	Graphene in thermoelectrics	INTERNATIONAL SUMMIT ON GRAPHENE AND 2D MATERIALS https://www.spectrumconferences.com/ (Valencia, Espanha)
2022/05/27	Aerogel materials for capacitive electrodes in supercapacitors	VIII Samsonov International Conference "Materials Science of Refractory Compounds" (MSRC-2022) National Technical University «Igor Sikorsky ¿yiv Polytechnic Institute» (Kyiv, Ucrânia)
2021/11/13	Flexible electrodes for supercapacitors based on reduced graphene oxide with and without additives	International Conference on Material Science Engineering Scientex Conferences (Viena, Áustria)
2020/11/20	Giant dielectric permittivity in doped strontium titanate ceramics	9th Global Conference on Materials Science and Engineering (CMSE 2020) (Kyiv, Ucrânia)
2020/07/07	Aliovalent doping engineering in SrTiO3-based electroceramics	3rd International Conference on Nanomaterials Science and Mechanical Engineering (ICNMSME-2020) Universidade de Aveiro (Aveiro, Portugal)
2019/07/09	Invited Talk "Utilizing reduced graphene oxide for harvesting / storage energy"	2nd International Conference on Nanomaterials Science and Mechanical Engineering University of Aveiro (Aveiro, Portugal)
2019/07	Strain Mediated Substrate Effect on the Properties of Polar Dielectric Thin Films	2nd International Conference on Nanomaterials Science and Mechanical Engineering University of Aveiro (Aveiro, Portugal)
2018/07/07	Invited talk "Thermoelectric performance of Nb doped SrTiO3 enhanced by reduced graphene oxide"	2nd International Conference & Expo on Green Energy and Technology (Barcelona, Espanha)
2016/07/11	Electrical conductivity and structural properties of reduced graphene oxide based samples	International Conference Research Trends in Mechanical Engineering (Aveiro, Portugal)
2013/05	Thin films for nanotechnology	work visit Centre de Recherche Public - Gabriel Lippmann, Belvaux, Luxemburg (Belvaux, Luxemburgo)
2008	Strontium titanate based thin films for tunable device applications	International Summer School on Inorganic Functional Materials (Portugal)
2007	Stress effect and microstructure properties on sol-gel SrTiO3 films	IV Jornadas CICECO (Portugal)

Organização de evento

	Nome do evento Tipo de evento (Tipo de participação)	Instituição / Organização
2021/07/22 - 2021/07/24	ANM 2021: 17th International conference on Advanced Nanomaterials, July 22-24, 2021, Aveiro, Portugal. (2021/07/22 - 2021/07/24) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal
2018/07/18 - 2018/07/20	ANM 2018: 11th International conference on Advanced Nanomaterials, 5th International conference on Advanced Graphene materials, 4th International conference on Advanced Magnetic and Spintronics materials, 2nd International conference on Advanced polymer materials and Nanocomposites, 1st International conference on Advanced Nanoelectronics and Organic light emitting diodes (2018/07/18 - 2018/07/20) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal
2017/07/19 - 2017/07/21	ANM 2017: 9th International conference on Advanced Nanomaterials, 3rd International conference on Advanced graphene materials, 2nd International conference on Advanced magnetic and spintronics materials, 1st International conference on Advanced polymer materials and Nanocomposites (2016/09/06 - 2016/09/09) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal
2016/09/06 - 2016/09/09	NANOSMAT 2016: 11th International Conference on Surfaces, Coatings and Nanostructured Materials (2016/09/06 - 2016/09/09) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal
2016/07/25 - 2016/07/27	ANM 2016: 7th International conference on Advanced Nanomaterials, 2st International conference on Graphene Technology, 1st International conference on Spintronics Materials (2016/07/25 - 2016/07/27) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal
2015/07/20 - 2015/07/22	ANM 2015: 6th International conference on Advanced Nanomaterials, 1st International conference on Graphene Technology, 1st International conference on Hydrogen storage (2015/07/20 - 2015/07/22) Conferência (Membro da Comissão Organizadora)	Universidade de Aveiro, Portugal

Participação em evento

	Descrição da atividade Tipo de evento	Nome do evento Instituição / Organização
2020/09 - 2020/09	Graphene Flagship: presentations and discussions: GRAPHENE FOR RESEARCH, INNOVATION, COLLABORATION	GRAPHENE FOR RESEARCH, INNOVATION, COLLABORATION Graphene Flagship, coordinated by Chalmers University of Technology , Suécia
2020/06 - 2020/06	Graphene Flagship: Presentations and Discussion about Graphene for energy storage application	Graphene for energy storage application Graphene Flagship, coordinated by Chalmers University of Technology , Suécia
2018/06 - 2018/06	Presentation "Development of flexible piezoelectric nanofilms for nanogenerators" in 3rd Open Campus Smart Green Homes Termotecnologia	3rd Open Campus Smart Green Homes Termotecnologia
2017/06 - 2017/06	Presentation "Reduced graphene oxide for thermoelectric applications" in Research Day 2017 in University of Aveiro Exposição	Research Day 2017 in University of Aveiro Universidade de Aveiro, Portugal
2016/08 - 2016/08	Presentations and discussions about thermoelectrics in 1st Stuttgart workshop on Thermoelectrics Oficina (workshop)	1st Stuttgart workshop on Thermoelectrics (SWT2016) Universität Stuttgart, Alemanha
2014/10 - 2014/10	Presentations and discussions about nanostructures for sollar cells in INL Workshop "Nanostructures for sollar cells" Oficina (workshop)	INL Workshop "Nanostructures for sollar cells" International Iberian Nanotechnology Laboratory, Portugal
2008/07 - 2008/07	Lecture "Strontium titanate based thin films for tunable device applications" Oficina (workshop)	FAME Summer School on Inorganic Functional Materials European Commission, Bélgica
2007/10 - 2007/10	Talks about scanning electron microscopy Oficina (workshop)	Advanced analytical scanning electron microscopy Universidade de Aveiro, Portugal
2007/01 - 2007/01	Talks about new architectures for passive electronics Oficina (workshop)	FAME First Winter School European Commission, Bélgica
2006/10 - 2006/10	Talks about biomedical use of hybrids and advanced multifunctional materials for optics, sensing and actuating Oficina (workshop)	FAME Second Joint Summer School "Biomedical Use of Hybrids and Advanced Multifunctional Materials for Optics, Sensing and Actuating" European Commission, Bélgica
2005/06 - 2005/06	Talks about grain-boundary related phenomena in ceramic materials Oficina (workshop)	COST 525 Training School "Grain-Boundary Related Phenomena in Ceramic Materials: From Micro- to Nano-scale Dimensions" Università degli Studi di Genova, Italy, Itália

Arbitragem científica em revista

	Nome da revista (ISSN)	Editora
2021 - Atual	Synthetic Metals	Elsevier
2021 - Atual	Materials Letters	Elsevier
2021 - Atual	Sustainable Energy & Fuels	RSC Publishing
2020 - Atual	Coatings	MDPI
2020 - Atual	Ionics	Springer
2019/11/11 - Atual	Energies (1996-1073)	MDPI AG
2019/05/04 - Atual	International Journal of Hydrogen Energy (0360-3199)	Elsevier
2018 - Atual	Applied Surface Science (0169-4332)	Elsevier
2017 - Atual	Materials	MDPI
2016 - Atual	Vacuum (0042-207X)	Elsevier
2016 - Atual	ACS Applied Materials & Interfaces (1944-8252)	American Chemical Society
2015 - Atual	Journal of Alloys and Compounds (0925-8388)	Elsevier
2015 - Atual	Materials Chemistry and Physics (0254-0584)	Elsevier
2015 - Atual	Physica E Low-dimensional Systems and Nanostructures (1386-9477)	Elsevier
2014 - Atual	Surface and Coatings Technology (0257-8972)	Elsevier
2013 - Atual	Journal of Physics and Chemistry of Solids	Elsiver
2013 - Atual	Surface Science (0039-6028)	Elsevier

Comissão de avaliação

	Descrição da atividade Tipo de assessoria	Instituição / Organização	Entidade financiadora
2023 - Atual	Reviewer in Advanced Functional Materials	Editions Scientifiques Elsevier, França

Tutoria

	Tópico	Nome do aluno
2021 - 2021	Advanced materials	Carlos Matos
2021 - 2021	Advanced materials	Diogo Caramelo
2021 - 2021	Advanced materials	Gabriel Martins
2021 - 2021	Advanced materials	Ruben Cotton
2020 - 2020	Advanced materials	DIOGO FILIPE COSTA OLIVEIRA
2020 - 2020	Advanced materials	Bruno Almeida
2020 - 2020	Advanced materials	Ricardo Cintra
2018 - 2019	Flexible nanoparticulated BaTiO3 -based piezoelectric composite films	Fernando Luís de Góis Rodrigues de Sá
2017 - 2017	Strain-Mediated Substrate Effect on the Dielectric and Ferroelectric Response of Potassium Sodium Niobate Thin Films	André Santos
2006 - 2006	Dielectric characterization of multiferroic films	Monika Malgorzata Tomczyk
2004 - 2004	Preparation of incipient ferroelectric thin films by sol-gel method and their characterization	Vitor M. X. Bergano

Distinções

Prémio

2008	Young Scientist Award in Symposium F: Multiferroic and magnetoelectric materials, with the work "Electric and Magnetic Properties of Incipient Ferroelectric Films Doped with Manganese" European Materials Research Society (E-MRS) Spring Meeting, Strasbourg, France, Portugal
2004	1st prize in the concurs of the poster with work "Microstructural studies of Mg doped SrTiO3 films" "XXXIX Meeting of the Portuguese Society for Microscopy and Cell Biology”, Aveiro, Portugal, Portugal

Outra distinção

2021	Feature paper publication in C-Journal of carbon research MDPI open access journal Multidisciplinary Digital Publishing Institute AG, Suiça
2021	"Editor's choice" paper publication in NANOMATERIALS MDPI open access journal Multidisciplinary Digital Publishing Institute AG, Suiça
2018	Publication in themed collection: 2018 Journal of Materials Chemistry C HOT Papers Royal Society of Chemistry, Reino Unido
2018	Feature paper publication in Coatings MDPI open access journal Multidisciplinary Digital Publishing Institute AG, Suiça