Title

Molecular adsorption on graphene

Authors

Authors

L. M. Kong; A. Enders; T. S. Rahman;P. A. Dowben

Comments

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Abbreviated Journal Title

J. Phys.-Condes. Matter

Keywords

graphene; band gap engineering; surface modification; molecular; adsorption; chemisorption; SINGLE-LAYER GRAPHENE; CHARGE-TRANSFER; CARBON NANOTUBES; ELECTRONIC-STRUCTURE; EPITAXIAL GRAPHENE; BILAYER GRAPHENE; HYDROGEN; STORAGE; GAS SENSORS; SUSPENDED GRAPHENE; COVALENT CHEMISTRY; Physics, Condensed Matter

Abstract

Current studies addressing the engineering of charge carrier concentration and the electronic band gap in epitaxial graphene using molecular adsorbates are reviewed. The focus here is on interactions between the graphene surface and the adsorbed molecules, including small gas molecules (H2O, H-2, O-2, CO, NO2, NO, and NH3), aromatic, and non-aromatic molecules (F4-TCNQ, PTCDA, TPA, Na-NH2, An-CH3, An-Br, Poly (ethylene imine) (PEI), and diazonium salts), and various biomolecules such as peptides, DNA fragments, and other derivatives. This is followed by a discussion on graphene-based gas sensor concepts. In reviewing the studies of the effects of molecular adsorption on graphene, it is evident that the strong manipulation of graphene's electronic structure, including p-and n-doping, is not only possible with molecular adsorbates, but that this approach appears to be superior compared to these exploiting edge effects, local defects, or strain. However, graphene-based gas sensors, albeit feasible because huge adsorbate-induced variations in the relative conductivity are possible, generally suffer from the lack of chemical selectivity.

Journal Title

Journal of Physics-Condensed Matter

Volume

26

Issue/Number

44

Publication Date

1-1-2014

Document Type

Review

Language

English

First Page

27

WOS Identifier

WOS:000343796100002

ISSN

0953-8984

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