Browsing by Author "Petrov, S."

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Chemical vapour deposition growth of graphene layers on metal substrates
(2014-01-01)
Lai, Y-C
;
Yu, S-C
;
Rafailov, P. M.
;
Vlaikova, E.
;
Valkov, S.
Graphene layers were grown by chemical vapour deposition (CVD) on Si wafers covered by a SiO2 substrate layer and a Ni interlayer, and on copper and nickel foil. The obtained graphene layers were characterized by Raman spectroscopy. The films grown on SiO2/Ni substrate and Ni foil comprise mainly multilayer defect-rich graphene, while those on Cu foil exhibit the spectroscopic fingerprint of relatively defect-free single-layer graphene due to the low carbon solubility in copper and the suitably chosen substrate position in a quasi-closed volume. Optimal growth conditions and the nature of defects in the layers are discussed.
Liquid crystal cell with graphene electrodes
(2017-01-01)
Marinova, V.
;
Tong, Z. F.
;
Petrov, S.
;
Lin, S. H.
;
Chen, M. S.
We demonstrate a graphene-based nematic liquid crystal cells fabricated by photo alignment technique. The modulation characteristics have been measured revealing that photo alignment method shows great potential for protecting the graphene layer on glass substrate during LC device fabrication.