Olena Okhay

Bolseiro(a)
gabinete: 3.2.20
extensão: 26203

atribuições

Research group: Nanotecnology Research Group (NRD)





short cv




Education



Ph. D. in Materials Science and Engineering (Ferroelectrics area), Department of Ceramics and Glass Engineering, University of Aveiro, Portugal, 11/2009


M. Sc. in Microelectronics and Semiconductor Devices, National Technical University of Ukraine “Kiev Polytechnic Institute”, Kiev, Ukraine, 03/1999


B. Sc. in Electronics, National Technical University of Ukraine “Kiev Polytechnic Institute”, Kiev, Ukraine, 06/1997




Research Interests


Material Science and Engineering; Nanotechnology; Microelectronic applications


Thin films and ceramics


Ferroelectrics, Multiferroics, Superconductors


Hydrogen storage, Solar cells, Carbon-based materials, Graphene


Nanostructure-structure-property-processing interrelationships



Awards


1st prize in the concurs of the poster in “XXXIX Meeting of the Portuguese Society for Microscopy and Cell Biology”, Aveiro, Portugal, 4-6 November 2004, with the work “Microstructural studies of Mg doped SrTiO3 films” O. Okhay, A. Wu, P.M. Vilarinho, I.M. Reaney, A.R.L. Ramos, E. Alves.


Young Scientist Award in recognition of best paper presented during European Materials Research Society (E-MRS) 2008 Spring Meeting, Strasbourg, France, May 26-30, 2008. Symposium F: Multiferroic and magnetoelectric materials, with the work “Electric and Magnetic Properties of Incipient Ferroelectric Films Doped with Manganese” O. Okhay, A. Tkach, P.M. Vilarinho, S. Bedanta, V.V. Shvartsman, P. Borisov, W. Kleemann.



Publications


Book chapters


R. Krishna, E. Titus, M. Salimian, O. Okhay, S. Rajendran, A. Rajkumar, J.M.G. Sousa, A.L.C. Ferreira, J. Campos Gil, J. Gracio. Chapter 10. Hydrogen storage for energy application in “Energy storage and Application”, Intech Open Access Publisher 2012 http://dx.doi.org/10.5772/51238



Scientific papers


O.A. Khymenko, G.A. Melkov, V.S. Melnikov, O.I. Okhay. Transport and microwave properties of in-situ pulsed-laser-deposited structures YBa2Cu3O7-X/YSZ/(1012)Al2O3 and YBa2Cu3O7-X/CeO2/(1012)Al2O3. Proceedings of the SPIE conference, Vol.3941, 2000, p.102.


O. Okhay, A. Wu, P.M. Vilarinho. The influence of Mg on the properties of SrTiO3 thin films. J. Europ. Cer. Soc., Vol.25, 2005, p.3079.


O. Okhay, V.M.X. Bergano, A. Wu and P.M. Vilarinho. Bi effect on the microstructure and dielectric properties of SrTiO3 thin films. Adv. Mater. Forum III, Vol.514, 2006, p.245.


V.A. Trepakov, M.E. Savinov, O. Okhay, A. Tkach, P.M. Vilarinho, A.L. Kholkin, I. Gregora and L. Jastrabik. Dielectric permittivity and Cr3+ impurity ion probe luminescence in SrTiO3 sol-gel ceramics. J. Europ. Cer. Soc., Vol.27, 2007, p.3705.


O. Okhay, A. Wu, P.M. Vilarinho, I.M. Reaney, A.R.L. Ramos, E. Alves, J. Petzelt and J. Pokorny. Microstructural studies and electrical properties of Mg-doped SrTiO3 thin films. Acta Mater., Vol.55, 2007, p.4947.


A. Tkach, O. Okhay, P.M. Vilarinho, and A.L. Kholkin. High dielectric constant and tunability of strontium titanate ceramics modified by chromium doping. J. Phys.: Condens. Matter, Vol.20, 2008, p.415224.


O. Okhay, A. Wu, P.M. Vilarinho, A. Tkach. Low temperature dielectric characterization of Mg-doped SrTiO3 thin films prepared by sol-gel. Appl. Phys. Lett., Vol.96, 2010, p.152906.


O. Okhay, A. Wu, P.M. Vilarinho, A. Tkach. Dielectric response of polycrystalline Sr1-1.5xBixTiO3 thin films under direct current bias. Appl. Phys. Lett., Vol.97, 2010, p.062912.


O. Okhay, A. Wu, P.M. Vilarinho, A. Tkach. Dielectric relaxation of Sr1-1.5xBixTiO3 sol-gel thin films. J. Appl. Phys., Vol.109, 2011, p.064103.


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. Appl. Phys. Lett., Vol.98, 2011, p.052903.


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., Vol.59, 2011, p.5388.


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, Vol. 426, 2012, p. 274.


O. Okhay, R. Krishna, M. Salimian, E. Titus, J. Gracio, L. M. Guerra, and J. Ventura. Electrical properties of polycarbonate and panipol by addition of graphene oxide and reduced graphene oxide as nanofillers. Journal of Applied Physics, Vol.113, 2013, p.064307.


M. Salimian, O. Okhay, E.Titus, R. Krishna, J.J. Gracio, L. Guerra, and J. Ventura. Electrical properties of PVA (Polyvinyl alcohol)/ Zeolite and PVP (PolyVinylPyrrolidone)/Zeolite composite. Accepted to ICPB5 conference proceedings book.


M. Salimian, O. Okhay, E.Titus, R. Krishna, J.J. Gracio, L. Guerra, and J. Ventura. Influence of polymers on electrical properties of LTA Zeolite. Accepted to Polymer International.


O. Okhay, A. Tkach, A. Wu, P.M. Vilarinho. Manipulation of dielectric permittivity of sol-gel SrTiO3 films by deposition conditions Accepted to Journal of Physics D: Appl. Phys.


O. Okhay, L.M. Guerra, J. Ventura, R. Krishna, M. Salimian, E. Titus, and J. Gracio. Conductivity changes in graphene oxide thin films by adding Ni in different states, Submitted to Appl. Phys. Lett.

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