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Effects of interaction of graphene with electron donor and acceptor moleculeshave been investigated by employing Raman spectroscopy. The G band softensprogressively with the increasing concentration of tetrathiafulvalene (TTF)which is an electron donor while the band stiffens with increasingconcentration of tetracyanoethylene (TCNE) which is an electron-acceptormolecule. Both TTF and TCNE broaden the G-band. The 2D band position is alsoaffected by interaction with TTF and TCNE. The intensity of the 2D-banddecreases markedly with the concentration of either. The ratio of intensitiesof the 2D and G bands decreases with increase in TTF and TCNE concentrations.The electrical resistivity of graphene varies in opposite directions oninteraction with TTF and TCNE. All these effects occur due to molecularcharge-transfer, as evidenced by the observation of charge-transfer bands inthe electronic absorption spectra.

Effects of interaction of electron donor and accepter molecules on the electronic structure of graphene