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Biaxial compressive strain engineering in graphene/boron nitride heterostructures.

ABSTRACT: Strain engineered graphene has been predicted to show many interesting physics and device applications. Here we study biaxial compressive strain in graphene/hexagonal boron nitride heterostructures after thermal cycling to high temperatures likely due to their thermal expansion coefficient mismatch. The appearance of sub-micron self-supporting bubbles indicates that the strain is spatially inhomogeneous. Finite element modeling suggests that the strain is concentrated on the edges with regular nano-scale wrinkles, which could be a playground for strain engineering in graphene. Raman spectroscopy and mapping is employed to quantitatively probe the magnitude and distribution of strain. From the temperature-dependent shifts of Raman G and 2D peaks, we estimate the TEC of graphene from room temperature to above 1000K for the first time.

SUBMITTER: Pan W

PROVIDER: S-EPMC3506982 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Biaxial compressive strain engineering in graphene/boron nitride heterostructures.

Pan Wei W Xiao Jianliang J Zhu Junwei J Yu Chenxi C Zhang Gang G Ni Zhenhua Z Watanabe K K Taniguchi T T Shi Yi Y Wang Xinran X

Scientific reports 20121127

Strain engineered graphene has been predicted to show many interesting physics and device applications. Here we study biaxial compressive strain in graphene/hexagonal boron nitride heterostructures after thermal cycling to high temperatures likely due to their thermal expansion coefficient mismatch. The appearance of sub-micron self-supporting bubbles indicates that the strain is spatially inhomogeneous. Finite element modeling suggests that the strain is concentrated on the edges with regular n ...[more]

PMID: 23189242

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