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Water-Gated Charge Doping of Graphene Induced by Mica Substrates

Title
Water-Gated Charge Doping of Graphene Induced by Mica Substrates
Authors
Shim, JLui, CHKo, TYYu, YJKim, PHeinz, TFRyu, S
Date Issued
2012-02
Publisher
AMERICAN CHEMICAL SOCIETY
Abstract
We report on the existence of water-gated charge doping of graphene deposited on atomically flat mica substrates. Molecular films of water in units of similar to 0.4 nm thick bilayers were found to be present in regions of the interface of graphene/mica heterostacks prepared by micromechanical exfoliation of kish graphite. The spectral variation of the G and 2D bands, as visualized by Raman mapping, shows that mica substrates induce strong p-type doping in graphene with hole densities of (9 +/- 2) X 10(12) cm(-2). The ultrathin water films, however, effectively block interfacial charge transfer, rendering graphene significantly less hole-doped. Scanning Kelvin probe microscopy independently confirmed a water-gated modulation of the Fermi level by 0.35 eV, which is in agreement with the optically determined hole density. The manipulation of the electronic properties of graphene demonstrated in this study should serve as a useful tool in realizing future graphene applications.
URI
https://oasis.postech.ac.kr/handle/2014.oak/13555
ISSN
1530-6984
Article Type
Article
Citation
NANO LETTERS, vol. 12, no. 2, page. 648 - 654, 2012-02
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류순민RYU, SUNMIN
Dept of Chemistry
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