Synthesis Characterization of Graphene Graphene Oxide Based Nanomaterials Nanocomposites

Abstract

Noble metal decorated GO/RGO sheets within inert polyvinyl alcohol (PVA) matrix were synthesized through a simple chemical method. Formation of optically induced Ag NPs is used to introduce a tuneable band gap in graphene. Photochromic effect was used for the formation of Ag NPs and was confirmed by the UV-Vis spectrums and TEM images of composites. The increasing number and size of Ag nanoparticles introduce tunable n-type doping in the GO/RGOPVA composites, as determined directly by the Raman spectroscopy, without the necessity of electrically gated device. Composites of stable cobalt nanoparticles in aqueous medium (Co NPs) with different shapes embedded within reduced graphene oxide sheets (RGO) were synthesized by different chemical methods namely co-precipitation, hydrothermal and by applying magnetic field for various shapes like sphere, cubes and rods respectively. TEM image of composites confirmed the embedded decoration of different shapes of Co NPs on RGO sheets. A comparative magnetic study for prepared materials from M-H curve were showing a change in shape of hysteresis loops due to transition from ferromagnetic to superparamagnetic behaviour and also the effect of shapes on magnetic properties was studied