Title

Molecular Adsorption On Graphene

Keywords

band gap engineering; chemisorption; graphene; molecular adsorption; surface modification

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, H2, O2, 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.

Publication Date

11-5-2014

Publication Title

Journal of Physics Condensed Matter

Volume

26

Issue

44

Number of Pages

-

Document Type

Review

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/0953-8984/26/44/443001

Socpus ID

84908178804 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84908178804

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