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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F12%3A00384498%21RIV13-GA0-61388955
rdf:type
n8:Vysledek skos:Concept
dcterms: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.
dcterms: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
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
skos:notation
RIV/61388955:_____/12:00384498!RIV13-GA0-61388955
n8:predkladatel
n9:ico%3A61388955
n4:aktivita
n16:P n16:I
n4:aktivity
I, P(GAP204/10/1677), P(GAP208/12/1062), P(IAA400400804), P(IAA400400911), P(KAN200100801), P(ME09060)
n4:cisloPeriodika
43
n4:dodaniDat
n7:2013
n4:domaciTvurceVysledku
n6:8172781 n6:1157744 n6:9704418
n4:druhVysledku
n17:J
n4:duvernostUdaju
n12:S
n4:entitaPredkladatele
n19:predkladatel
n4:idSjednocenehoVysledku
133450
n4:idVysledku
RIV/61388955:_____/12:00384498
n4:jazykVysledku
n18:eng
n4:klicovaSlova
graphene; isotopic labeling; layered compounds
n4:klicoveSlovo
n13:isotopic%20labeling n13:layered%20compounds n13:graphene
n4:kodStatuVydavatele
DE - Spolková republika Německo
n4:kontrolniKodProRIV
[FE8A3EEDE6E0]
n4:nazevZdroje
Chemistry - A European Journal
n4:obor
n5:CG
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
3
n4:projekt
n10:IAA400400911 n10:IAA400400804 n10:KAN200100801 n10:GAP204%2F10%2F1677 n10:GAP208%2F12%2F1062 n10:ME09060
n4:rokUplatneniVysledku
n7:2012
n4:svazekPeriodika
18
n4:tvurceVysledku
Kalbáč, Martin Frank, Otakar Kavan, Ladislav
n4:wos
000310066700039
s:issn
0947-6539
s:numberOfPages
8
n11:doi
10.1002/chem.201202114