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Preparation method of nano gas sensor

A gas sensor, nanotechnology, applied in the field of preparation of nano gas sensors, can solve the problems such as the inability to realize the rapid response of nitrogen dioxide gas, achieve excellent selectivity, strong stability and repeatability, and improve the effect of response speed

Pending Publication Date: 2022-05-13
昌吉学院
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the nitrogen dioxide gas sensor in this patent has the ability of rapid response, it also needs to work under high temperature conditions, and cannot achieve rapid response of nitrogen dioxide gas at room temperature

Method used

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  • Preparation method of nano gas sensor

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preparation example Construction

[0023] A preparation method for a nano gas sensor, comprising the following steps:

[0024] S1: Preparation of CdS nanorods: CdCl 2 2.5H 2 O and thiourea are added in the ethylenediamine solvent to obtain a mixed solution;

[0025] The mixed solution is reacted at 160°C-170°C for 9h-10h, and the precipitate is washed with ethanol and deionized water after the reaction to obtain the precipitate;

[0026] CdS nanorods can be obtained by drying the precipitate at 60°C-65°C for 11h-12h;

[0027] S2: Preparation of CdS / CuO / rGO nanocomposites: CuO and rGO were combined with CdS nanorods to obtain p-n heterojunction CdS / CuO / rGO nanocomposites;

[0028] S3: Preparation of CdS / CuO / rGO gas sensor: Disperse the powder of CdS / CuO / rGO nanocomposite material in ethanol solvent, obtain the dispersion liquid through ultrasonic dispersion, drop-cast the dispersion liquid evenly on the interdigitated electrodes, wait for After drying, a sensitive layer is formed to obtain a gas sensor.

[...

Embodiment 1

[0040] A preparation method for a nano gas sensor, comprising the following steps:

[0041] S1: Preparation of CdS nanorods: 5 mmol of CdCl 2 2.5H 2 0 and 8mmol of thiourea were added in 40mL of ethylenediamine solvent, and stirred continuously at room temperature for 30min, after fully dissolving, a mixed solution was obtained;

[0042] Pour the mixed solution into a stainless steel autoclave with a capacity of 50 mL and a polytetrafluoroethylene liner, react at 160 ° C for 10 h, wash the precipitate with ethanol and deionized water at least three times after the reaction, and obtain the precipitate;

[0043] Place the precipitate in a vacuum drying oven and dry at 60°C for 12 hours to obtain CdS nanorods;

[0044] S2: Preparation of CdS / CuO / rGO nanocomposite material: CuO and rGO were composited with CdS nanorods, the specific steps were dissolving 0.25g of CdS powder in 40mL of deionized water to obtain a CdS solution, and adding CuSO to the CdS solution 4 ·5H 2 O and g...

Embodiment 2

[0047] A preparation method for a nano gas sensor, comprising the following steps:

[0048] S1: Preparation of CdS nanorods: 5 mmol of CdCl 2 2.5H 2 0 and 8mmol of thiourea were added in 40mL of ethylenediamine solvent, and stirred continuously at room temperature for 30min, after fully dissolving, a mixed solution was obtained;

[0049] Pour the mixed solution into a stainless steel autoclave with a capacity of 50 mL and a polytetrafluoroethylene liner, react at 170 ° C for 9 h, wash the precipitate with ethanol and deionized water at least three times after the reaction, and obtain the precipitate;

[0050] Place the precipitate in a vacuum drying oven and dry at 65°C for 11 hours to obtain CdS nanorods;

[0051] S2: Preparation of CdS / CuO / rGO nanocomposite material: CuO and rGO were composited with CdS nanorods, the specific steps were dissolving 0.25g of CdS powder in 40mL of deionized water to obtain a CdS solution, and adding CuSO to the CdS solution 4 ·5H 2 O and gr...

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Abstract

The invention discloses a preparation method of a nano gas sensor, which comprises the following steps: S1, preparing a CdS nano rod: adding CdCl2. 5H2O and thiourea into an ethylenediamine solvent to obtain a mixed solution; reacting the mixed solution for 9-10 hours at the temperature of 160-170 DEG C, and washing the precipitate with ethanol and deionized water after the reaction is finished to obtain a precipitate; the precipitate is dried for 11-12 h at the temperature of 60-65 DEG C, and the CdS nanorod can be obtained; s2, preparation of a CdS / CuO / rGO nano composite material: CuO and rGO are compounded with the CdS nano rod, and the CdS / CuO / rGO nano composite material with a p-n heterojunction is obtained; s3, preparation of the CdS / CuO / rGO gas sensor: dispersing the powder of the CdS / CuO / rGO nano composite material in an ethanol solvent, performing ultrasonic treatment to obtain a dispersion liquid, uniformly dripping the dispersion liquid on an interdigital electrode, and forming a sensitive layer after drying to obtain the gas sensor. According to the invention, the responsivity to NO2 gas can be improved, and the response / recovery time can be shortened.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a preparation method of a nanometer gas sensor. Background technique [0002] With the development of science and technology and the continuous improvement of human living standards, environmental pollution has become more and more serious. NO 2 As one of the main culprits of environmental pollution, it can cause acid rain and photochemical smog, which seriously threatens the environment on which human beings live, and is extremely harmful to human health, such as respiratory diseases and cardiovascular and cerebrovascular diseases. Therefore, it is necessary to develop a portable environmental monitoring NO with low working temperature, low detection limit and high sensitivity. 2 Gas sensors are of great significance. The traditional metal oxide-based NO 2 Gas sensors are not only for NO 2 The selectivity is low, and it needs to work in a high temperature environment, which is re...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127Y02A50/20
Inventor 郭福强白海能张保花张政杨倩冯成吴涣星
Owner 昌吉学院
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