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Mechanical Strain of Chemically Functionalized Chemical Vapor Deposition Grown Graphene

Authors
Journal
The Journal of Physical Chemistry C
1932-7447
Publisher
American Chemical Society
Publication Date
Disciplines
  • Chemistry

Abstract

Chemical functionalization and mechanical strain of graphene are both of importance for the optimization of flexible electronic devices as both can alter the electronic structure of graphene. Here we investigate the combined effects of covalent aryl diazonium functionalization and mechanical strain on graphene by Raman spectroscopy. Raman spectroscopy provides a wealth of information regarding the electronic structure of graphene and can be easily applied to flexible device architectures. The use of chemical vapor deposition (CVD) grown polycrystalline graphene is found to exhibit increased reactivity towards diazonium functionalization. This is attributed to the increased reactivity of defects predominantly present along domain boundaries. Functionalization with nitrobenzene diazonium molecules causes p-type doping to occur in the CVD graphene. The combined effects of mechanical strain and chemical functionalization on the graphene are also investigated. The Raman peak width is affected due to phonon splitting when under strain as well as an increase in frequency due to doping. Interestingly, we also observe a decrease in the ID/IG ratio when strain is applied to the chemically functionalized graphene, indicating a possible morphological change to the surface.

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