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Molybdenum disulfide/indium hydroxide composite air-sensitive sensing material as well as preparation method and application thereof

A technology of gas-sensing sensing material, indium hydroxide, which is applied in the field of molybdenum disulfide/indium hydroxide composite gas-sensing sensing material and its preparation and application, and can solve the problems of high working temperature requirement, long recovery time, poor selectivity, etc. , to achieve the effects of highlighting selectivity, preventing aggregation, and helping adsorption and desorption

Active Publication Date: 2017-08-22
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is in order to solve existing detection NO x Sensitive materials have the problems of high working temperature requirements, low sensitivity, poor selectivity, and long recovery time. A molybdenum disulfide / indium hydroxide composite gas-sensitive sensing material and its preparation method and application are proposed;

Method used

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  • Molybdenum disulfide/indium hydroxide composite air-sensitive sensing material as well as preparation method and application thereof
  • Molybdenum disulfide/indium hydroxide composite air-sensitive sensing material as well as preparation method and application thereof
  • Molybdenum disulfide/indium hydroxide composite air-sensitive sensing material as well as preparation method and application thereof

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specific Embodiment approach 1

[0043] Specific Embodiment 1: In this embodiment, a molybdenum disulfide / indium hydroxide composite gas-sensitive sensing material is made of MoS 2 and indium salt; the MoS 2 The molar ratio with indium salt is (1~4):(0.5~3).

[0044] This embodiment has the following beneficial effects:

[0045] 1. MoS prepared in this embodiment 2 / In(OH) 3 Composite material, MoS 2 Lamellar structure, In(OH) 3 Polycrystalline material with thin crystal grains, MoS 2 It has a lamellar structure, which can not only effectively prevent aggregation, but also increase more contact sites, while In(OH) 3 The nanoparticles are dispersed on the nanosheets, which increases the catalytic sites of the gas, helps the gas adsorption and desorption, and improves the sensitivity of the composite material;

[0046] 2. MoS prepared by this embodiment 2 / In(OH) 3 Composite material as sensitive material for NO in air sensor x No heating is required during the detection process, and it can be carried...

specific Embodiment approach 2

[0050] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of indium hydroxide in the molybdenum disulfide / indium hydroxide composite gas sensing material is 5-10 nm. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0051] Specific Embodiment Three: In this embodiment, a method for preparing a molybdenum disulfide / indium hydroxide composite gas-sensitive sensing material is carried out according to the following steps:

[0052] One, take by weighing molybdenum-containing material and sulfur-containing material as raw material; Described molybdenum-containing material is Na 2 MoO 4 2H 2 O or (NH 4 ) 2 MoO 4 2H 2 O; the sulfur-containing material is CH 4 N 2 S;

[0053] The mass ratio of the molybdenum-containing material to the sulfur-containing material is (0.5-1.45): (0.3-1.90);

[0054] 2. Dissolve the raw materials weighed in step 1 in deionized water, then ultrasonically treat for 0.5-1h, and finally stir for 0.5-3h to obtain a mixed solution;

[0055] The volume ratio of the mass of the raw material weighed in the step 1 to the deionized water is (0.85-3.35) g: (50-70) ml;

[0056] 3. Put the mixed solution obtained in step 2 in a hydrothermal kettle, perform a hydrothermal...

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Abstract

The invention provides a molybdenum disulfide / indium hydroxide composite air-sensitive sensing material as well as a preparation method and application thereof. According to the molybdenum disulfide / indium hydroxide composite air-sensitive sensing material, the problems that an existing sensitive material for detecting NOx is high in working temperature requirement, low in sensitivity, poor in selectivity and long in recovery time are solved. The composite air-sensitive sensing material is prepared from MoS2 and indium salt. The preparation method comprises the following steps: (1) weighing the raw materials; (2) dissolving the weighed raw materials, so as to obtain mixed liquid; (3) carrying out hydrothermal reaction on the mixed liquid; (4) washing solid products; (5) preparing MoS2 suspension liquid; (6) preparing reaction liquid; (7) carrying out hydrothermal synthesis reaction on the reaction liquid; and (8) sequentially washing and drying solid products. The composite air-sensitive sensing material used as a sensitive material for preparing air-sensitive elements. The composite air-sensitive sensing material is high in sensitivity, outstanding in selectivity and low in cost. The composite air-sensitive sensing material is suitable for being applied to the preparation of air-sensitive sensing materials and air-sensitive elements.

Description

technical field [0001] The invention relates to a gas-sensitive sensing material, a preparation method and an application. Background technique [0002] With the development and progress of science and technology, the importance of sustainable development has become more and more prominent. In people's daily life, the monitoring of toxic and harmful gases in the environment has attracted much attention. Common toxic and harmful gases in the air such as NO x 、H 2 S, SO 2 , NH 3 , CO, etc., where NO x It is one of the main gaseous pollutants in the atmosphere. NO x is the source of environmental pollution, NO x Can cause acid rain and photochemical smog, causing serious diseases to humans, especially NO x It is easy to combine with hemoglobin in human blood, and also stimulates the lungs, causing many serious diseases. A large number of NOs have been explored x Gas sensors such as SnO 2 , ZnO, TiO 2 , In 2 o 3 and conductive polymers. To some extent, these gas s...

Claims

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Application Information

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IPC IPC(8): G01N27/30C01G39/06C01G15/00
CPCC01G15/00C01G39/06C01P2002/72C01P2004/04C01P2004/45C01P2004/80C01P2006/12G01N27/30
Inventor 史克英伊克拉姆李丽
Owner HEILONGJIANG UNIV
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