Interaction
between Quantum Dots of CdTe and Reduced
Graphene Oxide: Investigation through Cyclic Voltammetry and Spectroscopy
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Abstract
Cyclic
voltammetry has been used to investigate the interaction
between reduced graphene oxide (r-GO) and CdTe quantum dots (Q-CdTe).
For that, the composite of Q-CdTe with r-GO (r-GO-CdTe) was prepared
by carrying out the reduction of graphene oxide and the synthesis
of Q-CdTe simultaneously, in a single bath. r-GO-CdTe was characterized
by UV–visible, steady state fluorescence, time-resolved fluorescence,
X-ray diffraction (XRD), Raman, and transmission electron microscopy
(TEM). Cyclic voltammetry was employed to determine the quasi-particle
gap and band edge parameters of Q-CdTe and r-GO-CdTe. The blue shifts
in the quasi-particle gap of r-GO-CdTe have been attributed to the
strong interaction of graphene with CdTe. These interactions were
further verified by time-resolved fluorescence and Raman spectroscopy
which suggested strong electronic coupling between Q-dots and graphene