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MoS2/CeO2 composite gas-sensitive material as well as preparation method and application thereof

A gas-sensitive material, mos2 technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of high working temperature, high resistance of pure cerium oxide, etc., to achieve good selectivity and good reversibility , fast response/recovery effect

Active Publication Date: 2021-07-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • MoS2/CeO2 composite gas-sensitive material as well as preparation method and application thereof
  • MoS2/CeO2 composite gas-sensitive material as well as preparation method and application thereof
  • MoS2/CeO2 composite gas-sensitive material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Such as Figure 1-11 As shown, a MoS 2 / CeO 2 Composite gas sensing material, by adding CeO 2 Nanoparticles tightly attached to MoS 2 The surface of nanoflowers to get MoS 2 / CeO 2 Composite gas sensing material, the MoS 2 Flower-like structure with many worm-like micelles.

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

[0051] The present invention also includes a method for preparing MoS 2 / CeO 2 Composite gas-sensitive material method,

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

[0053] ② Preparation of MoS 2 Powder: Move the mixture obtained in step ① into a reaction kettle, heat at 220°C for 14 hours, and wash with...

Embodiment 2

[0078] The present invention also includes a method for preparing MoS 2 / CeO 2 Composite gas-sensitive material method,

[0079] ① Preparation of MoS 2 Hydrothermal solution: 1.0g of Na 2 MoO 4 2H 2 O and 1.2g of thioacetamide were added to 80mL of deionized water, the stirring temperature was controlled at 40-50°C, the stirring speed was 600-800rpm, and the stirring time was 10-15min, and 2mol / L of HCl was added to adjust the pH of the solution to 5 to obtain MoS 2 hydrothermal solution;

[0080] ② Preparation of MoS 2 Powder: Move the mixture obtained in step ① into a reaction kettle, heat at 220°C for 14 hours, and wash with deionized water several times to obtain MoS 2 Powder, and dry, the drying temperature is 60-80°C, and the drying time is 12-24h;

[0081] ③The MoS obtained in step ② 2 Added to 50mL of deionized water and 30mL of ethanol mixed solution, then, by fully stirring the Ce(NO 3 ) 3 ·6H 2 O is added and dissolved;

[0082] ④ Move the dispersion o...

Embodiment 3

[0086] A gas-sensitive coating for MoS 2 / CeO 2 The preparation method of the ethanol gas sensor of composite material is carried out according to the following steps:

[0087] ① First, 1.0g 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 a speed of 600 rpm for 10 min. Next, add 2mol / L HCl into the mixture solution until the pH value of the solution reaches 5;

[0088] ② Transfer the mixture obtained in step ① to a 100mL reactor, and heat at 220°C for 14h. MoS was obtained after several washes with deionized water 2 Powder, dried at 60°C for 12h;

[0089] ③Add 0.5g of 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 Ce to Mo is 1:20;

[0090] ④ Transfer the dispersion obtained in step ③ to a 100mL reactor, and treat it at 180°C for 24h. Th...

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Abstract

The invention relates to the technical field of semiconductor oxide gas-sensitive materials, in particular to a MoS2 / CeO2 composite gas-sensitive material as well as a preparation method and application thereof. According to the preparation method disclosed by the invention, the MoS2 nanoflower which is modified with CeO2 nanoparticles, has a large specific surface area and consists of a plurality of wormlike micelles is prepared by adopting a secondary hydrothermal method; a MoS2 / CeO2 gas-sensitive coating is prepared on an interdigital electrode after carrying out heat treatment on a MoS2 / CeO2 composite material through a tubular furnace, and finally heat treatment on is performed the MoS2 / CeO2 gas-sensitive coating through an aging table to obtain the ethanol gas-sensitive element based on MoS2 / CeO2. The maximum sensitivity of the gas sensitive element to 30 ppm ethanol gas at room temperature is 5.2, the response time and the recovery time are 7 s and 5 s respectively, the reversibility and the selectivity are good, the response / recovery speed is high, the simple and low-cost preparation method of secondary hydrothermal is adopted, CeO2 nanoparticles are successfully and tightly attached to MoS2 nanoflowers, and the preparation cost of the functional MoS2 / CeO2 nano material is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of semiconductor oxide gas sensitive materials, in particular to a MoS 2 / CeO 2 Composite gas sensitive material and its preparation method and application. Background technique [0002] With the development of science and technology, more and more flammable gases are used as energy sources 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. Combustible 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 transparent liquid at normal temperature and pressure, with...

Claims

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Application Information

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Patent Type & Authority Applications(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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