Temperature-induced strain release via rugae on the nanometer and micrometer scale in graphene monolayer

0476774 - FZÚ 2018 RIV US eng J - Journal Article
Verhagen, Timotheus - Valeš, Václav - Frank, Otakar - Kalbáč, Martin - Vejpravová, Jana
Temperature-induced strain release via rugae on the nanometer and micrometer scale in graphene monolayer.
Carbon. Roč. 119, Aug (2017), s. 483-491. ISSN 0008-6223. E-ISSN 1873-3891
R&D Projects: GA ČR(CZ) GA15-01953S; GA MŠMT LL1301
Institutional support: RVO:68378271 ; RVO:61388955
Keywords : graphene * wrinkle * low temperature Raman mapping * strain * doping * thermal expansion
OECD category: Condensed matter physics (including formerly solid state physics, supercond.); Physical chemistry (UFCH-W)
Impact factor: 7.082, year: 2017

Wrinkles are one possible rugae phase that can be observed in two-dimensional crystals. Those topographic features, with dimensions ranging from nanometers to micrometers, can be identified in single-layer graphene transferred onto various substrates. When the temperature of the sample is varied, the different thermal expansion coefficients of graphene and its supporting substrate lead to reconstruction of the graphene's topography, which results in spatially inhomogeneous strain and doping. Using Raman spectral mapping, we investigated in situ the temperature dependence (50-300 K) of topographic features in a graphene monolayer grown by chemical vapor deposition (CVD) and transferred onto a Si/SiO2 substrate. We find that the temperature-induced strain follows the temperature variation of the cubic lattice parameter of the Si substrate. Furthermore, the temperature-induced strain has an unambiguous relation to the topographic reconstruction of the graphene monolayer.
Permanent Link: http://hdl.handle.net/11104/0273195