Synthesis method of GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas

A synthesis method and nano-composite material technology are applied in the synthesis field of ZnO composite nano-structured gas-sensing materials, and can solve the problems of increasing the optimal working temperature of the sensor, unfavorable on-line detection for analysis and detection, complex sample pretreatment and detection procedures, etc.

Inactive Publication Date: 2020-07-07
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, these methods have some shortcomings: the hysteresis of analysis and detection is not conducive to on-line detection, and the sample pretreatment and detection procedures are relatively complicated. The gas-sensitive detection method can just make up for the shortcomings of the above-mentioned detection

Method used

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  • Synthesis method of GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas
  • Synthesis method of GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas
  • Synthesis method of GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas

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[0029] Example 1:

[0030] Synthesis of ZnO nanosheet gas sensitive materials:

[0031] 0.002mol ZnCl at room temperature 2 Add 0.04 mol of urea to 40 mL of deionized water, slowly add 1 mL of dilute hydrochloric acid (5 wt.%), and magnetically stir for 1 hour. The above homogeneous mixed solution was transferred to a 50 mL polytetrafluoroethylene lined stainless steel reactor, and reacted at 80° C. for 24 hours in an electric heating blast drying box. After the reaction is over, after the natural cooling to room temperature, the white precipitate obtained is washed with deionized water and absolute ethanol alternately by centrifugation for 3 times, and then placed in an electric blast drying oven at 80°C for 12 hours to obtain a white powder; The powder was calcined in a box-type electric furnace at 350°C (heating rate 5°C / min) for 1 hour to obtain ZnO nanosheets.

Example Embodiment

[0032] Example 2:

[0033] Synthesis of GQDs modified ZnO composite nano-structured gas-sensitive material Gas-sensitive material:

[0034] Weigh 0.8 g of ZnO nano flake powder and disperse it in 80 mL of deionized water, and divide it into 4 equal parts. Measure 0.2mL, 1.0mL, 2.0mL, 4.0mL graphene quantum dot dispersions and add them to the above ZnO dispersion to obtain a mixed dispersion of GQDs and ZnO, and ultrasonically treat for 30 minutes to make it fully mixed. The mixed dispersion of GQDs and ZnO was stirred and evaporated in the air at 60°C until it was completely dry. The obtained samples were named 0.1% GQDs-ZnO, 0.5% GQDs-ZnO, 1.0% GQDs-ZnO, 2.0% GQDs-ZnO, respectively. ZnO nanocomposite gas-sensitive materials modified with GQDs in different proportions can be obtained.

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Abstract

The invention relates to a synthesis method of a GQDs modified ZnO composite nanostructure gas sensitive material for detecting dimethylamine gas. The method comprises the following steps: adding GQDsin different proportions into ZnO nanosheets, and synthesizing to obtain the GQDs-modified ZnO composite nanostructure gas sensitive material, namely GQDs-ZnO. The GQDs-modified ZnO composite nanostructure gas sensitive material provided by the invention has an appropriate porous structure and a relatively high specific surface area, and the synthesis method is green, simple and safe, relativelysimple and convenient in raw material acquisition and relatively high in practical degree. When being used as a gas sensitive material, the invention shows excellent gas sensitive performance at the working temperature of 160 DEG C, shows relatively high sensitivity, relatively high linearity, excellent selectivity and relatively good repeatability on dimethylamine gas, has a gas detection lower limit of 0.1 ppm, and has huge potential in the aspect of dimethylamine gas detection.

Description

technical field [0001] The invention relates to a synthesis method of a GQDs-modified ZnO composite nanostructure gas-sensitive material used for detecting dimethylamine gas, and belongs to the field of inorganic nanometer material preparation. Background technique [0002] As a chemical raw material, dimethylamine can be used in medicine, textiles, insecticide dyes and accelerators, etc. Dimethylamine is a gas at room temperature and has a strong irritating odor similar to ammonia. Dimethylamine is flammable at a temperature of 400°C and has a strong irritating effect on the eyes and respiratory tract. Skin contact with liquid dimethylamine can cause necrosis, and eye contact can cause corneal damage and turbidity. [0003] Dimethylamine is a common low-molecular-weight organic amine, which usually exists in the natural environment and aquatic products, especially in high content in seafood. Dimethylamine in aquatic products is produced by trimethylamine oxide through enz...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/126
Inventor 李明伟别利剑张乐喜
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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