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Molybdenum trioxide nanostructure sensitive material and corresponding ammonia gas sensor and preparation method

A kind of ammonia gas sensor and nanostructure technology, applied in the direction of molybdenum oxide/molybdenum hydroxide, analysis materials, material resistance, etc., can solve the problems of low shape and limit the application of gas sensors, etc. The method is simple and suitable for mass production , the effect of good stability

Active Publication Date: 2021-08-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature exceeds 200 ° C, it is easily oxidized to MoO 3 , which limits the MoS 2 Application of gas sensor in testing high temperature gas
As a typical n-type semiconductor metal oxide, MoO 3 Considered to be a promising material for gas sensing, MoO 3 The anisotropic layered crystal structure has rich morphology in the nanostructure, but the morphology is still in a relatively low dimension, making more complex MoO 3 Nanostructuring and controlling the shape of nanostructures at the microscopic level remains a very challenging task

Method used

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  • Molybdenum trioxide nanostructure sensitive material and corresponding ammonia gas sensor and preparation method
  • Molybdenum trioxide nanostructure sensitive material and corresponding ammonia gas sensor and preparation method
  • Molybdenum trioxide nanostructure sensitive material and corresponding ammonia gas sensor and preparation method

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preparation example Construction

[0039] The preparation method of molybdenum trioxide nanostructure sensitive material comprises steps as follows:

[0040] (1) According to the mass ratio (1 ~ 4): (1 ~ 4), take sodium molybdate (Na 2 MoO 4 .2H 2 O) and thiourea (CH 4 N 2 S), and by mass volume ratio, (sodium molybdate+thiourea): deionized water=1:5, unit g:mL, sodium molybdate and thiourea are dissolved in deionized water, and the mixed solution is made by magnetic stirring Uniformly disperse to obtain mixed solution A;

[0041] (2) In the above mixed solution, take citric acid (C 6 h 8 o 7 ) and cetyltrimethylammonium bromide (CTAB), add mixed solution A, disperse by magnetic stirring, obtain mixed solution B, wherein, described citric acid and sodium molybdate are (1~ 2): (1~2);

[0042] (3) Transfer the mixed solution B to an autoclave at 140-200°C, keep it warm for 15-30h, cool to room temperature, wash and remove impurities, dry and grind to obtain MoS 2 powder;

[0043] (4)MoS 2 The powder i...

Embodiment 1

[0059] A MoS-based 2 Template-prepared MoO 3 The specific manufacturing process of the ammonia gas sensor of the microsphere nanostructure sensitive material is as follows:

[0060] Step 1, MoO 3 Preparation of microsphere nanostructure sensitive materials:

[0061] (1) 2.4g sodium molybdate (Na 2 MoO 4 .2H 2 O) and 2.8g thiourea (CH 4 N 2 S) Dissolve in 25ml of deionized water, and disperse the mixed solution evenly by magnetic stirring.

[0062] (2) Add 2.1g citric acid (C 6 h 8 o 7 ) and 0.5 g cetyltrimethylammonium bromide (CTAB), the mixed solution was also dispersed by magnetic stirring.

[0063] (3) The mixed solution was transferred to an autoclave at 180° C. for 22 h, and after cooling to room temperature, it was alternately washed 6 times with deionized water and ethanol to remove impurity ions and unreacted raw materials. The samples were dried at 60 °C for 15 h, and then the MoS 2 Grind to powder. MoS 2 Oxidation at 300°C for 3h to produce MoO 3 Mic...

Embodiment 2

[0068] A MoS-based 2 Template-prepared MoO 3 The specific manufacturing process of the ammonia gas sensor of the microsphere nanostructure sensitive material is as follows:

[0069] (1) 2.4g sodium molybdate (Na 2 MoO 4 .2H 2 O) and 2.8g thiourea (CH 4 N 2 S) Dissolve in 25ml of deionized water, and disperse the mixed solution evenly by magnetic stirring.

[0070] (2) Add 2.1g citric acid (C 6 h 8 o 7 ) and 0.5 g cetyltrimethylammonium bromide (CTAB), the mixed solution was also dispersed by magnetic stirring.

[0071] (3) The mixed solution was transferred to an autoclave at 180° C. for 22 h, and after cooling to room temperature, it was alternately washed 6 times with deionized water and ethanol to remove impurity ions and unreacted raw materials. The samples were dried at 60 °C for 15 h, and then the MoS 2 Grind to powder. MoS 2 Oxidation at 400°C for 1h.

[0072] (4) Take appropriate amount of deionized water and MoO 3 The microsphere nanostructure powder is...

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Abstract

The molybdenum trioxide nanostructure sensitive material, the corresponding ammonia gas sensor and the preparation method of the invention belong to the technical field of semiconductor oxide gas sensors. When preparing, take the corresponding amount of sodium molybdate and thiourea, citric acid and cetyltrimethylammonium bromide, mix them into a solution, and obtain MoS after heat preservation and drying. 2 Powder, calcined at the corresponding temperature to obtain MoO 3 Powder sensitive material. The sensitive material is made into a slurry and coated on the surface of the base, sintered at a corresponding temperature, electrodes are arranged correspondingly, and a heating layer is arranged on the inner leads of the base to obtain a sensor. The sensor shows ultra-high sensitivity to ammonia, the response to 100ppm ammonia reaches 4000, and the lower detection limit can reach 100ppb. The preparation process of the device is simple, small in size, suitable for mass production, and has broad application prospects in the detection of ammonia pollutants in the environment.

Description

Technical field: [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, in particular to a sensor based on MoS 2 Porous hollow microsphere / sheet nanostructure sensitive material prepared by template, corresponding ammonia gas sensor and preparation method. Background technique: [0002] Ammonia is an industrially vital chemical commonly used in the manufacture of industrial raw materials such as fertilizers, soda and nitric acid. In addition, indoor ammonia mainly comes from antifreeze in concrete. These antifreeze are compounds containing ammonia and will release ammonia as environmental factors change, becoming the main source of indoor environmental pollution. Studies have shown that the lowest ammonia concentration that humans can perceive is 5.3ppm, and long-term exposure to ammonia can have serious effects on human health. As a volatile alkaline gas, when inhaled by the human body, a small amount of ammonia will be absorbed by NO 2 N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12C01G39/02B82Y15/00B82Y30/00B82Y40/00
CPCB82Y15/00B82Y30/00B82Y40/00C01G39/02C01P2002/85C01P2004/04C01P2004/16C01P2004/32C01P2004/61C01P2004/62C01P2004/64C01P2006/17G01N27/127
Inventor 孟凡利刘洋张俊杰张华苑振宇李晋
Owner NORTHEASTERN UNIV LIAONING