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Small: preparation of water assisted high quality graphene glass and its application in transparent thermochromic display

wallpapers News 2020-10-22

graphene glass is a new type of two-dimensional material graphene combined with traditional glass. "Shikaiyu Shanhui shuihuaizhu Chuanmei.". Graphene glass is expected to combine the excellent properties of glass graphene such as transparency conductivity as a good carrier to exp the application of graphene. However the preparation of high-quality graphene films directly on glass surface without the assistance of metal catalysts faces great challenges. Because the surface of glass has very low catalytic activity for hydrocarbon cracking the migration barrier of carbon fragments on the surface is high the surface diffusion rate is low. The obtained graphene has the problems of very small domain size low growth rate easy to form amorphous carbon impurities. In addition there are many problems in graphene films such as multi-layer nuclei high density grain boundaries defects which lead to relatively high surface resistance low optical transmittance of graphene films which seriously hinder the application of graphene glass in transparent conductive films transparent heating. Therefore it is of great significance to develop graphene preparation methods with low surface resistance high optical transmittance.

recently Liu Zhongfan Zhang Yanfeng research group of Peking University Beijing graphene Research Institute obtained high-quality graphene films with low surface resistance high optical transmittance directly on the glass surface by introducing trace water into the chemical vapor deposition (CVD) developed high-performance transparent thermochromic display devices using graphene glass as transparent heater. It is found that a small amount of water at high temperature can initiate a weak oxidation reaction of carbon: C (s / g) H2O (g) = CO (g) H2 (g) thus etching the carbon fragments formed in the reaction process. Thus water can effectively inhibit the formation of amorphous carbon obtain high-quality graphene films with almost no adsorption of amorphous carbon; in addition they found that the growth etching process of graphene can be balanced by adjusting the concentration of water appropriate nucleation density larger domain size can be achieved. Finally the surface resistance of the graphene glass with a transmittance of ~ 93% (550 nm) is ~ 1170 Ω / sq which is only ~ 20% of that of the graphene glass obtained by conventional CVD without water assistance. They found that high quality low surface resistance graphene glass can show good performance in transparent heating. By patterning graphene film combining with transparent thermochromic film (the composite material of reversible thermochromic dye transparent PDMS) a high performance transparent thermochromic display was developed the function of digital 0-9 was realized. The researchers of

believe that this research will exp the method of directly preparing high-quality graphene on glass lay a foundation for the development of multifunctional transparent heating devices. This work was published on small (DOI: 10.1002 / small. 201905485) with the title of "H2O exchange promoted synthesis of high quality graph on glass its application in see through thermal displays".

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