KnE Materials Science

ISSN: 2519-1438

The latest conference proceedings on physical materials, energy materials, electrical materials.

Controlling Surface Potential of Graphene Using dc Electric Field

Published date: Oct 12 2016

Journal Title: KnE Materials Science

Issue title: IV Sino-Russian ASRTU Symposium on Advanced Materials and Processing Technology (ASRTU)

Pages: 183-189

DOI: 10.18502/kms.v1i1.583

Authors:

R. Vidyasagar - kholkin@urfu.ru

B. Camargo

E. Pelegova

K. Romanyuk

A.L. Kholkin

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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