In order to implement the Guidelines for the Development of New Material Industry, the Ministry of Industry and Information Technology, the Ministry of Finance and the Supervisory Commission intend to establish the first insurance compensation mechanism for key new materials and carry out pilot work. To this end, the Raw Materials Industry Department organized and compiled the Catalogue of the First Application Demonstration Guidance for Key New Materials (2017 edition) (hereinafter referred to as "Catalogue"), which was published on June 16, 2017.
The catalogue published in this paper mainly covers three categories: advanced basic materials, key strategic materials and advanced new materials. Among them, advanced basic materials include advanced steel materials, advanced non-ferrous metal materials, advanced chemical materials, advanced inorganic non-metallic materials and other materials; key strategic materials include high-performance fibers and composites, rare earth functional materials, advanced semiconductor materials and new display materials.
In order to enhance the readers'understanding of the key new materials, the mining and metallurgical Park briefly interpreted the various new materials published in the catalogue and pushed them in the form of a series of pictures and texts. This paper mainly introduces the frontier new materials in the key new materials.
Graphene film
1, performance requirements:
The average transmittance in the visible region is better than 85%, and the surface resistance is less than 10 ohms. The surface resistance is stable and uniformly distributed. It has bending properties and can withstand more than 10,000 cycles of bending tests when the ITO film fails.
2, application area:
Microelectronics and New Energy
3, characteristics analysis:
Graphene has attracted much attention due to its unique structure, excellent performance, high theoretical research value and broad application prospects. Graphene oxide (GO) is a derivative of graphene containing rich oxygen functional groups. It can be obtained by chemical oxidation stripping of cheap graphite, and then graphene can be prepared by reduction treatment. Graphene oxide (GO) has good water solubility and is easy to form film. Therefore, graphene transparent conductive film can be prepared by graphene oxide (GO) solution film formation and reduction treatment of graphene oxide film. It is one of the important applications of graphene. Graphene transparent conductive film, with its rich resources, good chemical stability and flexibility, may replace indium and tin, which are lack of resources and brittle. As a new generation of transparent conductive film, oxide (ITO) has shown great potential in the field of flexible display.
4. Methods of preparation:
Because GO has good water solubility and is easy to form films, the reduction of GO to graphene has become an important way to prepare graphene with low cost and large amount, which is of great significance to promote the macro application of graphene. The transparent conductive film of flexible graphene with low cost and large area can be prepared by using GO solution to form film and then reducing GO film. The key is how to effectively remove oxygen-containing functional groups on GO surface and obtain graphene and its thin film materials with high conductivity. Nowadays, the highly efficient reduction of GO is realized by using strong acid reducing agent, which breaks through the previous viewpoint that GO reduction can only be effectively carried out in alkaline environment. This method can not only achieve a large amount of efficient reduction of GO powder, but also is very suitable for direct reduction of GO film. The volume conductivity of graphene films obtained by reduction can reach 3 x 104S/m, which is obviously better than that of chemical reduction methods. More importantly, while removing the oxygen-containing functional groups between the layers of the films, the reaction products precipitate from the films in the form of liquid phase. The capillary force produced reduces the thickness and structure of the films significantly, and increases the binding force between the graphene layers. Therefore, the graphene films obtained after reduction are conductive. Electricity, mechanical strength and flexibility have made remarkable progress, which has solved the bottleneck problem of destruction of thin film structure by existing reduction methods.
