A kind of hierarchical structure nano in2o3/graphene composite material and its preparation method and application

A composite material and graphene technology, which is applied in the analysis of materials, material analysis by electromagnetic means, instruments, etc., can solve the problems of high control parameters and difficult control, and achieve good gas sensitivity performance, short reaction time and high yield Effect

Inactive Publication Date: 2019-01-04
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Application Information

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Problems solved by technology

At present, there are many research reports on gas-sensitive materials of nitrogen oxides, such as the recent preparation of heterojunction NO by spinning method. x Gas-sensitive materials (Shuang Xu, Jun Gao, Linlin Wang, Kan Kan, Yu Xie, Pei KangShen, Li Li and Keying Shi. Role of the Heterojunctions in In 2 o 3 -composited SnO 2 Nanorods Sensor and Their Remarkable Gas-Sensing Performance for NOx at Roomtemperature.2015, Nanoscale, DOI:10.1039 / C5NR03796D), the working temperature can be lowered to room temperature, but the spinning technology in this process requires high equipment control parameters and is not easy to control

Method used

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  • A kind of hierarchical structure nano in2o3/graphene composite material and its preparation method and application
  • A kind of hierarchical structure nano in2o3/graphene composite material and its preparation method and application
  • A kind of hierarchical structure nano in2o3/graphene composite material and its preparation method and application

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Embodiment 1

[0030] The invention provides a multi-level structure nano In 2 o 3 / Graphene composite gas sensing material, nano In 2 o 3 In situ growth on the surface of reduced graphene oxide, the final product is nano-In 2 o 3 The original nanoparticles wrapped in graphene and the regular brick-like structure In 2 o 3 / Graphene composite material, wherein the graphene content is 0.05-0.2% of the total weight. Said a kind of hierarchical structure nanometer In 2 o 3 The structure of graphene composite gas-sensitive material is as accompanying drawing 1 (includes Figure 1a , Figure 1b and Figure 1c ); Its XRD spectrogram is as figure 2 shown.

[0031] Composite material preparation:

[0032] First prepare graphene oxide by the improved Hummers method, reduce graphene oxide with hydrazine hydrate, then evenly disperse an appropriate amount of reduced graphene oxide into ethylene glycol, add InCl 3 4H 2 O, magnetically stir for 1h, put the 50ml beaker containing the mixed so...

Embodiment 2

[0034] The specific preparation method of the present invention is to weigh 1.1326 parts of InCl by mass ratio 3 4H 2 O (0.002mol) was dissolved in 20 parts of ethylene glycol, stirred to fully dissolve, and a clear solution was obtained. In addition, 0.0008 parts of graphene was accurately weighed and dissolved in another 20 parts of ethylene glycol, dispersed and mixed evenly. After the graphene is fully dispersed in the ethylene glycol solution, the InCl 3 4H 2 The clarified solution of O is slowly added to the graphene solution during the stirring process, and the stirring is continued to make it fully mixed and adsorbed. Finally, the container containing the mixed solution is placed in a polytetrafluoroethylene-lined reactor, and then placed on the outside of the container Add 0.8 parts of 15mol / L ammonia water, and put the reaction kettle into a microwave reactor for reaction. Using microwave heating and auxiliary magnetic stirring, when the temperature rises to 180°...

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Abstract

The invention discloses a multi-level structure nano In2O3 / graphene composite material and its preparation method and application. The multi-level structure nano In2O3 / graphene composite material has a brick-like structure. The present invention also provides the preparation method of multi-level structure nano In2O3 / graphene composite material, indium salt and reduced graphene oxide soluble in ethylene glycol and precipitant ammonia water are in ethylene glycol solution and ammonia water vapor under microwave heating condition The formed gas-liquid interface undergoes a chemical reaction, and the reaction products are taken away by the tumbling ethylene glycol solution, and new products continue to be produced. The present invention has the following advantages: the nano-In2O3 / graphene original nanoparticles prepared by the microwave gas-liquid interface method are small and uniform, and then these original nanoparticles are partially self-assembled into a brick-like nanostructure, and the multi-level structure nano-In2O3 The / graphene composite material has good gas-sensing performance and good selectivity for nitrogen oxide gas at 100 °C.

Description

technical field [0001] The invention relates to a novel nitrogen oxide gas sensitive material and its preparation and application, in particular to a multi-level structure nano In 2 o 3 / Graphene composite materials and their preparation methods and applications. Background technique [0002] Nitrogen oxides (NO x ) often refers to NO and NO 2 of mixed gas. Nitrogen oxides can irritate the lungs and make it harder to fight off respiratory diseases such as colds. People with respiratory problems, such as asthmatics, are more susceptible to the effects of nitrogen oxides. In children, nitrogen oxides may impair lung development. Nitrogen oxides, mainly nitrogen monoxide and nitrogen dioxide, are also an important cause of photochemical smog and acid rain. Photochemical smog has a characteristic odor, irritates the eyes, damages plants, and can reduce atmospheric visibility. In addition, nitric acid and nitrous acid produced by the reaction of nitrogen oxides with water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 桂阳海郭智荣赵建波王海燕
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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