Preparation method of molybdenum disulfide/cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, components and sensors

A molybdenum disulfide, gas sensor technology, applied in instruments, scientific instruments, measuring devices, etc., can solve the problems of high working temperature, high resistance of pure cerium oxide, etc., and achieve good selectivity, good reversibility, response// Fast recovery effect

Active Publication Date: 2022-05-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure cerium oxide has a large resistance and requires a higher operating temperature when used alone

Method used

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  • Preparation method of molybdenum disulfide/cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, components and sensors
  • Preparation method of molybdenum disulfide/cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, components and sensors
  • Preparation method of molybdenum disulfide/cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, components and sensors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] like Figure 1-11 shown, a molybdenum disulfide / cerium oxide composite gas-sensing structure by incorporating CeO 2 Nanoparticles are tightly attached to MoS 2 surface of nanoflowers to obtain molybdenum disulfide / cerium oxide composite gas sensing structure, the MoS 2 Flower-like structure with many worm-like micelles.

[0050] The MoS 2 The diameter of the nanoflowers is 600-720 nm and the thickness is 200-240 nm. The CeO 2 The diameter of the nanoparticles is 10–30 nm.

[0051] The present invention also includes a method for preparing the molybdenum disulfide / cerium oxide composite gas-sensing structure,

[0052] ①Preparation of MoS 2 Hydrothermal solution: under strong magnetic stirring, the Na 2 MoO 4 ·2H 2 O and thioacetamide were added to deionized water to obtain a mixed solution, and 2 mol / L HCl was added to the mixed solution until the pH value of the solution reached 5;

[0053] ②Preparation of MoS 2 Powder: transfer the mixed solution obtained in...

Embodiment 2

[0079] The present invention also includes a method for preparing the molybdenum disulfide / cerium oxide composite gas-sensing structure,

[0080] ①Preparation of MoS 2 Hydrothermal solution: put 1.0 g of Na 2 MoO 4 ·2H 2 O and 1.2 g of thioacetamide were added to 80 mL of deionized water, and the stirring temperature was controlled to 40-50 o C. The stirring speed is 600~800 rpm, and the stirring time is 10~15 min, and 2 mol / L HCl is added to adjust the pH of the solution to 5 to obtain MoS 2 hydrothermal solution;

[0081] ②Preparation of MoS 2 Powder: transfer the mixed solution obtained in step ① to the reaction kettle, and put it at 220 o MoS was obtained after heating at C for 14 h and washing with deionized water for several times. 2 Powder, and dry, drying temperature is 60~80 o C, the drying time is 12~24 h;

[0082] ③ Combine the MoS obtained in step ② 2 was added to a mixed solution of 50 mL of deionized water and 30 mL of ethanol, and then the Ce(NO 3 ) ...

Embodiment 3

[0087] A preparation method of an ethanol gas sensor whose gas sensitive coating is a molybdenum disulfide / cerium oxide composite structure, is carried out according to the following steps:

[0088] ① First, put 1.0 g of Na 2 MoO 4 ·2H 2 O and 1.2 g of thioacetamide were added to 80 mL of deionized water to obtain a mixed solution, which was magnetically stirred at 600 rpm for 10 min. Next, 2 mol / L HCl was added to the mixture solution until the pH value of the solution reached 5;

[0089] ② Transfer the mixture obtained in step ① to a 100 mL reaction kettle, and put it at 220 o Heated at C for 14 h. MoS was obtained after several washes with deionized water 2 powder, at 60 o Dry at C for 12 h;

[0090] ③ Put the 0.5 g MoS obtained in step ② 2 Add to 50 mL of deionized water and 30 mL of ethanol. Then, 0.06 g of Ce(NO 3 ) 3 ·6H 2 O is dissolved in the above dispersion, and the molar ratio of the Ce and Mo is 1:20;

[0091] ④ Move the dispersion liquid obtained in ...

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Abstract

The invention relates to the technical field of semiconductor oxide gas-sensing materials, in particular to a preparation method of a molybdenum disulfide / cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, components and sensors. The present invention adopts secondary hydrothermal preparation to be decorated with CeO 2 MoS composed of many worm-like micelles with nanoparticles and large specific surface area 2 nanoflowers; subsequently MoS 2 / CeO 2 After the composite structure was heat-treated in a tube furnace, MoS was prepared on the interdigitated electrodes 2 / CeO 2 The gas-sensitive coating is finally heat-treated in an aging station to obtain a MoS-based 2 / CeO 2 ethanol gas sensor. The gas sensor has a maximum sensitivity of 5.2 to 30ppm ethanol gas at room temperature, the response time and recovery time are 7s and 5s respectively, the reversibility and selectivity are good, and the response / recovery speed is fast. A low-cost preparation method, the CeO 2 Nanoparticles successfully adhere tightly to MoS 2 On nanoflowers, the functional MoS is greatly reduced 2 / CeO 2 Fabrication costs of nanostructures.

Description

technical field [0001] The invention relates to the technical field of semiconductor oxide gas-sensing materials, in particular to a preparation method of a molybdenum disulfide / cerium oxide composite gas-sensing structure and its application in gas-sensing coatings, elements and sensors. Background technique [0002] With the development of science and technology, more and more combustible gases are used as energy in industrial production and people's daily life. However, while flammable gases bring great convenience to people, there are also huge hidden dangers. After the leakage of flammable gas reaches the explosion limit, once there is an ignition source, it will cause accidents such as combustion and explosion, causing serious economic losses and even endangering life safety. Flammable gases usually refer to city gas, liquefied petroleum gas, gasoline vapor, alcohol vapor, natural gas, and coal mine gas. Among them, ethanol is a flammable, volatile, colorless and tra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 张冬至张建华李停停王东岳王兴伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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