Research on Graphene Materials in Ceramics

For the first time, the research literature of graphene materials in ceramics has successfully controlled the growth of graphene nanoribbons in hexagonal boron nitride grooves by template method, and opened the graphene band gap. Together, they tested their excellent electrical properties at room temperature. Metal nanoparticles are used to etch a monocrystalline boron nitride hexagonal substrate, and nanocrystalline trenches with straight edges, monoatomic layer thickness and controlled width are cut along the zigzag direction to obtain graphene nanoribbons with a width of less than 10nm and 1/1. The length of several micrometers in the groove was measured by chemical vapor deposition method. The results show that the use of stepped epitaxial growth of graphene in the trench can form a continuous lattice planar heterostructure on the top of the hexagonal boron nitride. They have now developed a field effect transistor (FET). At room temperature, the current on-off ratio of devices smaller than 5nm is greater than 1.0*104, the carrier mobility is as high as 750cm2/(V.s), and the electrical transport band gap is as high as 0.5eV. Wang Haomin's team has made breakthroughs in the preparation of graphene on ceramic substrates and obtained invention patents in the United States and my country. This paper was published in the journal Nature Communications. Researchers at AlbaCenteno have developed a new type of graphene ceramic material, adding graphene to improve the electrical and mechanical properties of the ceramic. The graphene team has now announced a new go solution, published in the 'European Journal of Chemistry'. SPS was used to homogenize the alumina and graphene oxide solutions. It can be seen from the experimental results that the graphene content is 0.22%, the ceramic cracking strength and tensile strength are increased by more than 50%, and the electrical conductivity is increased by nearly 1.0×108 times, but other functional changes are not obvious. The addition of graphene to graphite ceramics can improve its mechanical properties, but does not affect its electrical conductivity and tensile strength. It is studied to add graphene to bauxite to increase its tensile strength and change the brittleness and hardness of ceramic materials. The technology is simple and convenient, and can be applied to various occasions. In addition, this technology can also be used to improve the performance of ceramic materials such as ZrO2, SiC, TiO2, and Si3N4. To deal with the agglomeration of graphene in the alumina matrix, Zhang discussed different surfactants, different ratios of graphene, and different sintering processes. The results show that adding an appropriate amount of graphene can significantly increase the density, hardness, fracture toughness and bending strength of graphene Al2O3 composite ceramics. With the increase of sintering temperature and holding time, the density first increases and then decreases. When the graphene content is 0.4vol%, the graphene data sintering temperature is 1500℃, the holding time is 30min, and the composite data is the best. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Knowledge of lithium battery separator processing technology