Electrostatic Super Coupling in Copper Sulphide (Cu_2S)- Reduced Graphene Oxide Composite and their Enhanced Optical Characteristics

摘要

The composite of reduced graphene oxide-Cu_2S was synthesized by facile and cost effective one-step hydrothermal process. Powder XRD reveals the formation of Reduced Graphene Oxide (RGO) and Cu_2S composite nanostructures. Average crystallite size of 16.5 nm was estimated for composite material from XRD measurement. Raman and FTIR analysis confirm the formation of graphene oxide and reduced graphene oxide-Cu_2S composites. Origin of strong electrostatic interaction between Cu_2S and RGO was also inferred from FTIR and Raman investigations. UV absorption spectral analysis illustrates the wide optical absorption region of the prepared composite material. The band gap of the composite was also calculated using the absorbance spectra. The obtained band gap of the composite was 1.64 eV which was much lower expected for copper sulphide particles in nano regime.