About: Effects of Heat Treatment on Raman Spectra of Two-Layer 12C/13C Graphene

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The Raman spectra of two-layered graphene on a silicon substrate were studied in the temperature range from 298 to 1073 K in an inert atmosphere. Isotopic engineering was used to fabricate two-layer graphene specimens containing 13C atoms in the top layer and 12C atoms in the bottom layer, which allowed the behavior of each particular layer to be distinguished as a function of temperature. It is demonstrated that the top layer exhibits much lower Raman temperature coefficients than the bottom one for both the G and the G' modes. We suggest that the changes in the Raman spectra of graphene observed during thermal cycling are predominantly caused by a superposition of two effects, namely, the mechanical stress in graphene exerted by the substrate and the intrinsic changes in the graphene lattice caused by the temperature itself. The top graphene layer is proposed to be more relaxed than the bottom graphene layer and thus reflects almost exclusively the temperature variations as a freestanding graphene layer would. The Raman spectra of two-layered graphene on a silicon substrate were studied in the temperature range from 298 to 1073 K in an inert atmosphere. Isotopic engineering was used to fabricate two-layer graphene specimens containing 13C atoms in the top layer and 12C atoms in the bottom layer, which allowed the behavior of each particular layer to be distinguished as a function of temperature. It is demonstrated that the top layer exhibits much lower Raman temperature coefficients than the bottom one for both the G and the G' modes. We suggest that the changes in the Raman spectra of graphene observed during thermal cycling are predominantly caused by a superposition of two effects, namely, the mechanical stress in graphene exerted by the substrate and the intrinsic changes in the graphene lattice caused by the temperature itself. The top graphene layer is proposed to be more relaxed than the bottom graphene layer and thus reflects almost exclusively the temperature variations as a freestanding graphene layer would. (en)
Title	Effects of Heat Treatment on Raman Spectra of Two-Layer 12C/13C Graphene Effects of Heat Treatment on Raman Spectra of Two-Layer 12C/13C Graphene (en)
skos:prefLabel	Effects of Heat Treatment on Raman Spectra of Two-Layer 12C/13C Graphene Effects of Heat Treatment on Raman Spectra of Two-Layer 12C/13C Graphene (en)
skos:notation	RIV/61388955:_____/12:00384498!RIV13-GA0-61388955
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP204/10/1677), P(GAP208/12/1062), P(IAA400400804), P(IAA400400911), P(KAN200100801), P(ME09060)
http://linked.open...iv/cisloPeriodika	43
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Kavan, Ladislav Kalbáč, Martin Frank, Otakar
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Ústav fyzikální chemie J. Heyrovského AV ČR, v.v.i.
http://linked.open...dnocenehoVysledku	133450
http://linked.open...ai/riv/idVysledku	RIV/61388955:_____/12:00384498
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	graphene; isotopic labeling; layered compounds (en)
http://linked.open.../riv/klicoveSlovo	isotopic labeling layered compounds graphene
http://linked.open...odStatuVydavatele	DE - Spolková republika Německo
http://linked.open...ontrolniKodProRIV	[FE8A3EEDE6E0]
http://linked.open...i/riv/nazevZdroje	Chemistry - A European Journal
http://linked.open...in/vavai/riv/obor	CG
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Supramolecular assemblies with carbon nanotubes Spectroscopy and spectroelectrochemistry of chemically doped carbon nanostructures Magnetic properties of carbon nanostructures in neutral and doped state Bioactive Biocompatible Surfaces and Novel Nanostructured Composites for Applications to Medicine and Drug Delivery Spectroscopy and spectroelectrochemistry of graphene and graphene multilayers The electrochemical gating of individual and bundled Single Walled Carbon Nanotubes
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	18
http://linked.open...iv/tvurceVysledku	Kalbáč, Martin Kavan, Ladislav Frank, Otakar
http://linked.open...ain/vavai/riv/wos	000310066700039
issn	0947-6539
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1002/chem.201202114

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