Preparation Of Graphene Based Nanocomposite Materials By Microwave-thermal Reaction

Graphene, a monolayer of carbon atoms packed into a dense honeycomb crystal structure, has attracted tremendous attention from both the experimental and theoretical scientific communities in recent years. Because of its unique nanostructure and extraordinary properties, graphene sheets are attractive as potential nanoscale building blocks for composite materials.As recently demonstrated, graphene can be obtained in bulk quantity by chemical reduction of graphene oxide in solution. However, because of the van der Waals interactions, the as-reduced graphene sheets tend to form irreversible agglomerates and even restack to form graphite. In order to obtain high-quality graphene, the incorporation of some molecules or polymers into the sheets is an approach to reduce the aggregation.Deposition of inorganic materials, such as metallic, semiconducting, and insulating nanoparticles/nanoclusters, into the graphene nanosheets can form interesting graphene based hygrid materials with superior properties for wide application in optical, electrical, catalytic or sensing fields. In addition, the large-scale production cost of graphene sheets is much lower than that of CNTs. Therefore graphene is a very promising candidate of new carbonaceous materials.This paper mainly studies the microwave synthesis of gold nanoparticles, CdS quantum dots, Graphene-gold nanocomposites and Graphene-CdS nanocomposites. Through optimizating reaction temperature, microwave power and microwave time, we controllable to pepare uniform size distribution of gold nanoparticles and CdS quantum dots. Furthermore, through the microwave-themal method reduce graphite oxide-gold or CdS precursor in solution, we successfully prepare stable structure, good performance of Graphene-gold nanocomposites and Graphene-CdS nanocomposites. Because the microwave-thermal method can synthesize nanomaterial and nanocomposite rapidly and simply, and need not using toxic reduction reagents when prepare graphene, therefore, this method has a broad applied prospect.