Chemistry Reference
In-Depth Information
Fig. 8. Changes in the position of G-band plotted against the logarithm of concentration
of TTF and TCNE. Inset shows the data plotted against the concentration (From
reference 52).
We have followed the variation in the G-bands of EG, DG and HG on
interaction with different of concentrations TTF and TCNE. All the
samples show an increase in the G-band frequency on interaction with
TCNE and a decrease in the G-band frequency on interaction with TTF.
Figure 9 shows the changes in the G-band position of the three graphene
samples with varying concentrations of TTF and TCNE. The change in
the G-band frequency is maximum in the case of EG and least in the case
of HG. Thus, the shifts in the G-band in the EG, DG and HG samples
are 25,17 and 11 cm
-1
respectively on interaction with 0.1M TCNE. The
full-width-at-half-maxima (FWHM) of the G-bands of the three graphene
samples also vary with the concentration of TTF and TCNE. The FWHM
of the G-band generally increases on interaction with TTF and TCNE,
the magnitude of increase being highest in the case of EG. We also
notice that the initial increase is generally sharp. We could obtain reliable
