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Issue 20, 2013
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Toward tunable doping in graphene FETs by molecular self-assembled monolayers

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Abstract

In this paper, we report the formation of self-assembled monolayers (SAMs) of oleylamine (OA) on highly oriented pyrolytic graphite (HOPG) and graphene surfaces and demonstrate the potential of using such organic SAMs to tailor the electronic properties of graphene. Molecular resolution Atomic Force Microscopy (AFM) and Scanning Tunneling Microscopy (STM) images reveal the detailed molecular ordering. The electrical measurements show that OA strongly interacts with graphene leading to n-doping effects in graphene devices. The doping levels are tunable by varying the OA deposition conditions. Importantly, neither hole nor electron mobilities are decreased by the OA modification. As a benefit from this noncovalent modification strategy, the pristine characteristics of the device are recoverable upon OA removal. From this study, one can envision the possibility to correlate the graphene-based device performance with the molecular structure and supramolecular ordering of the organic dopant.

Graphical abstract: Toward tunable doping in graphene FETs by molecular self-assembled monolayers

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Supplementary files

Article information


Submitted
14 Mar 2013
Accepted
29 May 2013
First published
04 Jul 2013

Nanoscale, 2013,5, 9640-9644
Article type
Paper

Toward tunable doping in graphene FETs by molecular self-assembled monolayers

B. Li, A. V. Klekachev, M. Cantoro, C. Huyghebaert, A. Stesmans, I. Asselberghs, S. De Gendt and S. De Feyter, Nanoscale, 2013, 5, 9640
DOI: 10.1039/C3NR01255G

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