Molecular charge-transfer interaction with single-layer graphene

Late, Dattatray J and Ghosh, Anupama and Chakraborty, Biswanath and Sood, AK and Waghmare, Umesh V and Rao, CNR (2011) Molecular charge-transfer interaction with single-layer graphene. In: Journal of Experimental Nanoscience, 6 (6). pp. 641-651.

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Abstract

While the effect of electrochemical doping on single-layer graphene (SG) with holes and electrons has been investigated, the effect of charge-transfer doping on SG has not been examined hitherto. Effects of varying the concentration of electron donor and acceptor molecules such as tetrathiafulvalene (TTF) and tetracyanoethylene (TCNE) on SG produced by mechanical exfoliation as well as by the reduction of single-layer graphene oxide have been investigated. TTF softens the G-band in the Raman spectrum, whereas TCNE stiffens the G-band. The full-width-at-half-maximum of the G-band increases on interaction with both TTF and TCNE. These effects are similar to those found with few-layer graphene, but in contrast to those found with electrochemical doping. A common feature between the two types of doping is found in the case of the 2-D band, which shows softening and stiffening on electron and hole doping, respectively. The experimental results are explained on the basis of the frequency shifts, electron-phonon coupling and structural inhomogeneities that are relevant to molecule-graphene interaction.

Item Type:	Journal Article
Publication:	Journal of Experimental Nanoscience
Publisher:	Taylor and Francis Group
Additional Information:	Copyright of this article belongs to Taylor and Francis Group.
Keywords:	graphene;doping;Raman spectroscopy
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit Division of Physical & Mathematical Sciences > Physics
Date Deposited:	30 Mar 2012 10:39
Last Modified:	02 Apr 2012 10:38
URI:	http://eprints.iisc.ac.in/id/eprint/44193

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