Preparation method of composite nanomaterial of nano ZnO and graphene nanosheet

Abstract

The invention discloses a preparation method of a composite nanomaterial of a nano ZnO substrate and a graphene nanosheet. Nano ZnO and the graphene nanosheet are composited to form the composite nanomaterial in a sol-gel method and mechanical alloying combined mode, so that the preparation method is simple and easy to realize and short in reaction time; the finished composite nanomaterial is good in chemical stability; graphene has higher conductivity and can adjust an energy band structure of nano ZnO; nano ZnO has a higher seebeck coefficient, and the nano ZnO substrate and the graphene nanosheet are synthesized, so that interface scattering of phonons can be increased significantly; a recombination rate of an electron-hole pair can be reduced; the appearance of nano ZnO can be adjusted; the heat conductivity of nano ZnO can be reduced; and the photocatalytic efficiency of nano ZnO can be improved. Nitrate of to-be-doped ions comprises any one of aluminum nitrate, ferric nitrate, cobalt nitrate, nickel nitrate, silver nitrate and gold nitrate.

Description

technical field [0001] The invention relates to the technical field of new nanometer materials, in particular to a method for preparing a composite nanomaterial of nanometer ZnO-based materials and graphene nanosheets. Background technique [0002] Nanotechnology is one of the cutting-edge technologies in the world today. It is an interdisciplinary science integrating condensed matter physics, colloid chemistry, coordination chemistry, chemical reaction kinetics, surface and interface chemistry. Developed countries in the world have always regarded nanomaterials as a science The focus of research and technology development, the research of nano-materials will promote the development of information technology, biomedicine, environmental protection, automation technology and energy science in the 21st century, and bring revolutionary changes to human life. Nano-zinc oxide has many special Excellent properties, such as piezoelectricity, fluorescence, non-toxicity and non-migrat...

AI Technical Summary

Problems solved by technology

[0002] Nanotechnology is one of the cutting-edge technologies in the world today. It is an interdisciplinary science integrating condensed matter physics, colloid chemistry, coordination chemistry, chemical reaction kinetics, surface and interface chemistry. Developed countries in the world have always regarded nanomaterials as a science The focus of research and technology development, the research of nano-materials will promote the development of information technology, biomedicine, environmental protection, automation technology and energy science in the 21st century, and bring revolutionary changes to human life. Nano-zinc oxide has many special Excellent properties, such as piezoelectricity, fluorescence, non-toxicity and non-migration, ability to absorb and scatter ultraviolet rays, etc., the theory and application of photocatalytic methods represented by nano-ZnO in the removal of organic pollutants have received extensive attention. At the same time, nano-ZnO is also a potential thermoelectric material with high-efficiency thermoelectric conversion characteristics. The wet chemical method of nano-ZnO has good prospects in large-scale production, but because of the use of organic dispersants, surfactants and organic precursors On the other hand, when using nano-ZnO photocatalysis, due to the band gap of nano-ZnO, the generated electron-hole pairs are not only easy to recombine but also have a short life. The response range is narrow, so it is necessary to reduce the recombination rate of electron-hole pairs to improve the photocatalytic efficiency of nano-ZnO. When using the thermoelectric properties of nano-ZnO, due to the large phonon thermal conductivity of nano-ZnO, it affects its thermoelectric properties. Further improvement, so it is necessary to reduce the thermal conductivity of nano-ZnO and increase the contact thermal resistance. Studies have shown that combining nano-ZnO with carbon materials, such as carbon nanotubes (CNT) and C60, can effectively improve the photocatalytic efficiency and Contact thermal resistance. Among various carbon materials, graphene is a two-dimensional carbon atom crystal with a thickness of one atom. Using the unique electrical properties of graphene to modify nano-ZnO to prepare composite nanomaterials with better performance has become an important research topic