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Vidyasagar, R., Camargo, B., Pelegova, E., Romanyuk, K., & Kholkin, A. (2016). Controlling Surface Potential of Graphene Using dc Electric Field. KnE Materials Science, 1(1), 183-189. https://doi.org/10.18502/kms.v1i1.583

https://doi.org/10.18502/kms.v1i1.583

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authors

  • R. Vidyasagar
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  • B. Camargo
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  • E. Pelegova
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  • K. Romanyuk
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  • A.L. Kholkin
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Published Date

  • Oct 12, 2016

Controlling Surface Potential of Graphene Using dc Electric Field

KnE Materials Science / IV Sino-Russian ASRTU Symposium on Advanced Materials and Processing Technology (ASRTU) / Pages 183-189

Abstract

In this work, we study surface potential of graphite deposited on SiO2/Si substrate using Kelvin Probe Force Microscopy (KPFM) and Electric Force Microscopy (EFM). The amplitude modulated KPFM (AM-KPFM) shows that the graphene layer work function is 4.69±0.02 eV, whereas frequency modulated KPFM (FM-KPFM) revealed 4.50±0.02 eV. The work function indifference of 0.19±0.02 eV was attributed to the superior resolution of FM-KPFM and higher detection sensitivity of AM-KPFM. Subsequent EFM mapping suggests that the phase monotonically increases with increasing applied dc bias voltage in the range from -5 V to 5 V. This phase shift is ascribed to the induced charge polarization at tip-graphene surface due to interatomic interactions induced by dc field effects.

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