Preparation method of composite nanomaterial of nano ZnO and graphene nanosheet

A technology of graphene nanosheets and composite nanomaterials, which is applied in the field of new nanomaterials, can solve the problems of complex post-processing, short life of electron-hole pairs, and high cost, and achieve simple and easy preparation methods and chemical stability of finished products Good, short reaction time effect

Inactive Publication Date: 2013-08-21
JIANGSU YUEDA NEW MATERIAL TECH +1
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  • Abstract
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  • Application Information

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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Put the graphene nanosheets into 85% sulfuric acid, stir at 50°C for 8 minutes, filter, wash and then dry, and the obtained sample is ball milled on a high-energy ball mill for 3 hours at a speed of 210r / min; 0.06mol of nitric acid hexahydrate Zinc was dissolved in 1000ml deionized water to make solution I, and 0.12mol of sodium hydroxide was weighed and dissolved in 1500ml of deionized water to make solution II, and then solution II and 0.0048g of treated graphene nanosheets were placed in Slowly add it dropwise to solution I under the stirring of a fast-rotating magnetic stirrer to obtain a white precipitate. After the dropwise addition, continue to stir for 1 hour to make the reaction complete. The obtained solution is filtered and washed with distilled water and absolute ethanol for 3 times. Dry in a constant temperature drying oven at 90°C for 10 hours. After the dried material is fully ground, put it into a muffle furnace and roast at 600°C for 3 hours. The roasted...

Embodiment 2

[0018] The graphene nanosheets were stirred in 85% sulfuric acid at a temperature of 50°C for 10 minutes, filtered, washed and then dried. The obtained sample was ball milled on a high-energy ball mill for 3 hours at a speed of 180r / min. 0.00486mol cobalt nitrate and 0.06mol hexahydrate Dissolve zinc nitrate in 1300ml of deionized water to make solution I, weigh 0.13mol of sodium hydroxide and dissolve it in 1600ml of deionized water to make solution II, then put solution II and 0.0028g of graphene nanosheets in rapid rotation Slowly added dropwise to solution Ⅰ under the stirring of a special magnetic stirrer to obtain a white precipitate. After the dropwise addition, continue to stir for 1 hour to make the reaction complete. The obtained solution is filtered and washed twice with distilled water and absolute ethanol, and then put Dry in a drying oven at 90°C for 10 hours. After the dried material is fully ground, it is put into a muffle furnace and roasted at 700°C for 3 hour...

Embodiment 3

[0020] The graphene nanosheets were stirred in 85% sulfuric acid at a temperature of 30°C for 10 minutes, filtered, washed and then dried. The obtained sample was ball milled on a high-energy ball mill for 3 hours at a speed of 170r / min; 0.00316mol silver nitrate and 0.06mol hexahydrate Dissolve zinc nitrate in 1250ml of deionized water to make solution I, weigh 0.125mol of sodium hydroxide and dissolve it in 1500ml of deionized water to make solution II, then put solution II and 0.0046g of graphene nanosheets in rapid rotation Slowly add it dropwise into solution I under the stirring of a special magnetic stirrer to obtain a white precipitate. After the dropwise addition, continue stirring for 1 hour to make the reaction complete. The obtained solution is filtered and washed with distilled water and absolute ethanol for 3 times, then put Dry in a drying oven at 90°C for 10 hours. After the dried material is fully ground, put it into a muffle furnace and roast at 800°C for 3 ho...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/06B01J23/80B01J23/66
Inventor 吴子华谢华清徐德善虞小波许健
Owner JIANGSU YUEDA NEW MATERIAL TECH
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