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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  • Abstract
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  • Application Information

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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 methods.
However, in the past scientific research, these gas-sensing performance enhancement methods mainly focused on the improvement of the sensitivity of the material, while ignoring to a certain extent that these performance improvements were based on the increase of the sensor’s optimal operating temperature.

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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Experimental program
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Embodiment 1

[0030] Synthesis of ZnO nanosheet gas sensitive materials:

[0031] 0.002mol ZnCl at room temperature 2 and 0.04mol of urea were sequentially added into 40mL of deionized water, slowly added into 1mL of dilute hydrochloric acid (5wt.%), and magnetically stirred for 1h. The above homogeneously mixed solution was transferred to a 50 mL polytetrafluoroethylene-lined stainless steel reaction kettle, and reacted in an electric blast drying oven at 80°C for 24 hours. After the reaction was completed, after cooling to room temperature naturally, the obtained white precipitate was alternately centrifuged with deionized water and absolute ethanol for 3 times, and then dried 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 h to obtain ZnO nanosheets.

Embodiment 2

[0033] Synthesis of GQDs-modified ZnO composite nanostructure gas-sensing materials Gas-sensing materials:

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