Abstract
Advanced nano composite, containing Ag, was synthesized by coating on reduced graphene oxide (rGO)-carbon nanotube (CNT). Ag-rGO-CNT nanocomposite obtained by hydrothermal treatment of an aqueous dispersion of graphene oxide (GO) and CNTs. After the rGO-CNT composites have been dipped in silver salt solution, the spontaneous redox reaction between these two leads to the formation of nanohybrid materials consisting of rGO-CNT decorated with Ag NPs. Physicochemical characterization of Ag-rGO-CNT was carried out by scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS), fourier transform infrared spectroscopy (FT-IR) and TGA. Electrical resistivity measurements and thermal effect on resistivity of Ag-rGO-CNT was also studied after acid treatment. The dc conductivity was found within the range of 0.08–0.4 Ω cm for pure composite, measured by 4-in line–probe dc electrical conductivity measuring technique. Thermal conductivity is stable with all temperatures in isothermal studies showing excellent stability of Ag-rGO-CNT material. Graphene is attributed to its unique physical and chemical properties, e.g., subtle electronic characteristics, attractive π–π interaction, and strong adsorptive capability. This is used for in-vitro studies of dopamine on carbon fibre microelectrode that shows an excellent performance for dopamine with a detection limit of 0.033 μM and response time of 12s.