Funded by the National Science Fund for Distinguished Young Scholars, Professor Luo Shenglian's group from the State Key Laboratory of Biochemical Sensing and Metrology of Hunan University proposed the first one-step method to prepare graphene with a layered structure in the research of graphene-metal nanocomposites. -Metal nanocomposites, the research results were published online on April 8, 2001 in the internationally renowned journal Small, and received the attention of relevant international media on April 11, among which "ChemistryViews" under the ChemPubSocEurope (European Chemical Publishing Association) "OneSteptoGrapheneComposites" introduced the work. The report stated that “the currently reported graphene-metal nanomaterials have to be prepared by chemical or thermal reduction of a mixture of graphene oxide and metal precursors. These methods involve highly toxic chemical reagents, high temperatures, and multi-step reactions. Luo of Hunan University, China Shenglian and colleagues used electrochemical co-deposition to realize the layer-by-layer self-assembly of metal nanoparticles and graphene. Compared with pure graphene film, this material has better conductivity and larger specific surface area. This method has popularization value. It can be widely used in the preparation of graphene-based composite materials, such as the preparation of electronic devices, supercapacitors, and composite materials for sensors." Peer experts evaluated the importance of this research result as one of the top 15% in this field.

　　Graphene has received great attention in chemistry, physics, materials, energy, environment and other fields in recent years due to its unique electrical properties, mechanical properties, thermal properties and high specific surface area. The preparation of graphene and its composites is an extremely important topic in the field of graphene research. How to prepare graphene and its composites simply, quickly, and greenly, while preventing the aggregation of graphene sheets, enables graphene-based materials to be large-scale The premise of the application. The currently reported preparation of graphene-based composite materials involves chemically or thermally reducing graphene oxide to graphene, and then compounding with other components (or their precursors) through chemical or physical methods. This process not only involves highly toxic chemical reagents, high temperature and multi-step reactions, but also has disadvantages such as the aggregation of graphene sheets and the uncontrollable distribution of various components. Professor Luo Shenglian’s research group directly used graphene oxide and metal salt aqueous solutions as raw materials, and directly prepared a layered structure of graphene sheets and metal nanoparticles alternately assembled by one-step electrodeposition. The metal nanoparticle layer blocked the graphene sheet. Aggregate, and at the same time act as a conductive channel between graphene sheets, so that the composite film has a very high specific surface area and conductivity. The method does not require toxic chemical reagents, high temperature and multi-step reaction process, has simple, fast and green characteristics, and can be further extended to prepare other graphene-based composite materials.

　　The graphene-based composite material combined by this subject not only has great application prospects in electronic devices, supercapacitors and sensors, but also has great application potential in the field of environmental pollution control, such as photocatalytic degradation of organic pollutants. Combining graphene with a semiconductor photocatalyst in a similar way, the large specific surface area of graphene can greatly promote the adsorption of organic pollutants and improve the mass transfer efficiency of the photocatalytic process; the layered self-assembled structure has a large interface area, which is beneficial The separation and transmission of photo-generated carriers of the catalyst can avoid the recombination of photo-generated charges and improve the photoelectric conversion efficiency.