Electrical and lattice vibrational behaviors of graphene devices on flexible substrate under small mechanical strain

Yun Hi Lee, Yoon Joong Kim

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18 Citations (Scopus)

Abstract

We present systematic experimental study on the electrical response and two-phonon Raman scattering mode of graphene under small uniaxial strain. The graphene, which was initially grown by chemical vapor deposition, was transferred to a transparent-flexible-polyethylene-terephthalate substrate. It was found that the electrical resistance increases as the stain is increased after a slight decrease in very small strain regimes of <0.20%. This is due to a relaxation of intrinsic ripples created during the transfer of the graphene to the polyethylene-terephthalate substrate. The gauge factor in the linear response regime was found to be about 22. Also, the 2D Raman bands of the strained graphene showed a distinct red-shift of -37 cm -1 per 1% strain for the 2D + mode and -46 cm -1 per 1% strain for the 2D - mode. Finally, we determined the Gruneisen parameters of γ 2Δ+ ∼ 2.05 and γ 2Δ-∼ 2.55 for the phonons in free-standing graphene without a substrate. Our results provide electro-mechanical parameters for graphene-based flexible devices and show the potential of graphene for measuring strain in future flexible electronics.

Original languageEnglish
Article number083102
JournalApplied Physics Letters
Volume101
Issue number8
DOIs
Publication statusPublished - 2012 Aug 20

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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