Gas-sensor nanometer sensitive material, slurry with gas-sensor nanometer sensitive material, preparing method of gas-sensor nanometer sensitive material, preparing method of slurry and application of gas-sensor nanometer sensitive material

A gas sensor, sensitive material technology, applied in nanotechnology, analytical materials, nanotechnology and other directions, can solve the problems of consistency, poor repeatability, uneven film thickness, cracking of the coating layer, etc., to achieve easy mass production, The effect of high sensitivity and enhanced adhesion

Inactive Publication Date: 2016-01-20
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because nanomaterials are easy to agglomerate when heated, it is easy to cause cracking of the coating film after heat treatment, uneven film thickness, poor consistency and repeatability, etc.

Method used

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  • Gas-sensor nanometer sensitive material, slurry with gas-sensor nanometer sensitive material, preparing method of gas-sensor nanometer sensitive material, preparing method of slurry and application of gas-sensor nanometer sensitive material
  • Gas-sensor nanometer sensitive material, slurry with gas-sensor nanometer sensitive material, preparing method of gas-sensor nanometer sensitive material, preparing method of slurry and application of gas-sensor nanometer sensitive material
  • Gas-sensor nanometer sensitive material, slurry with gas-sensor nanometer sensitive material, preparing method of gas-sensor nanometer sensitive material, preparing method of slurry and application of gas-sensor nanometer sensitive material

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Add sodium stannate to ultrapure water, ultrasonically disperse for 5 minutes to obtain a 0.01mol / L transparent homogeneous aqueous solution, add ultrasonically dispersed 0.05mol / L urea ethanol solution, the volume ratio of the two is 1:1, and continue to ultrasonically mix After 10 minutes, the obtained mixed solution was transferred to a hydrothermal reaction kettle, and reacted at 120°C for 12h. After the reaction was completed, it was cooled to room temperature, and the sediment at the bottom was collected, washed by centrifugation, and dried in an oven at 60°C for 24h to finally obtain nano-SnO 2 hollow ball.

[0041] The nano-SnO obtained after drying 2 Hollow sphere powder, add distilled water and ultrasonically disperse for 15min, add Pd(NO 3 ) 2 solution, Pd(NO 3 ) 2 with SnO 2 The mass ratio of the solution is 1:100, add ammonia water to the pH of the mixed solution = 9, stir at room temperature for 12 hours, centrifuge to collect the bottom precipitate, ...

Embodiment 2

[0048] Add potassium stannate to ultrapure water, and ultrasonically disperse for 10 minutes to obtain a 0.02mol / L transparent homogeneous aqueous solution, add ultrasonically dispersed 0.1mol / L urea ethanol solution, the volume ratio of the two is 1.8:1, and continue to ultrasonically mix After 15 minutes, the obtained mixed solution was transferred to a hydrothermal reaction kettle, and reacted at 150°C for 24h. After the reaction was completed, it was cooled to room temperature, and the sediment at the bottom was collected, washed by centrifugation, and dried in an oven at 80°C for 12h to finally obtain nano-SnO 2 hollow ball.

[0049] The nano-SnO obtained after drying 2 Hollow sphere powder, add distilled water and ultrasonically disperse for 20min, add Pd(NO 3 ) 2 solution, Pd(NO 3 ) 2 with SnO 2 The mass ratio of the solution is 2:100, adding ammonia water to the pH of the mixed solution = 10, stirring at room temperature for 24 hours, centrifuging to collect the b...

Embodiment 3

[0057] Add potassium stannate to ultrapure water, and ultrasonically disperse for 20 minutes to obtain a 0.04mol / L transparent homogeneous aqueous solution, add ultrasonically dispersed 0.4mol / L urea ethanol solution, the volume ratio of the two is 3:1, and continue to ultrasonically mix After 20 minutes, the obtained mixed solution was transferred to a hydrothermal reaction kettle, and reacted at 180°C for 24h. After the reaction was completed, it was cooled to room temperature, and the sediment at the bottom was collected, washed by centrifugation, and dried in an oven at 80°C for 12h to finally obtain nano-SnO 2 hollow ball.

[0058] The nano-SnO obtained after drying 2 Hollow sphere powder, add distilled water and ultrasonically disperse for 20min, add Pd(NO 3 ) 2 solution, Pd(NO 3 ) 2 with SnO 2 The mass ratio of the solution is 2:100, adding ammonia water to the pH of the mixed solution = 10, stirring at room temperature for 24 hours, centrifuging to collect the bot...

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Abstract

The invention relates to a gas-sensor nanometer sensitive material, slurry with the gas-sensor nanometer sensitive material, preparing of the gas-sensor nanometer sensitive material, preparing of the slurry and an application of the gas-sensor nanometer sensitive material. A preparing method of the gas-sensor nanometer sensitive material includes the following steps that 1, stannate is added into ultrapure water and subjected to ultrasonic dispersion, a stannate solution is obtained, a urea ethanol solution is added, ultrasonic processing continues, an obtained mixed solution is transferred into a hydrothermal reaction kettle, after reaction is completed, cooling is carried out, and bottom precipitate is collected, centrifugally washed, arranged in a dryer and dried; 2, nanometer SnO2 hollow sphere powder obtained after drying is added into distilled water to be subjected to ultrasonic dispersion, a Pd(NO3)2 solution is dropwise added under the stirring condition, ammonium hydroxide is added till the pH of the mixed solution ranges from 9 to 12, the mixture is stirred at the indoor temperature, bottom precipitate is centrifugally collected, washed to be neutral and dried, and finally Pd-doping nanometer SnO2 hollow spheres are obtained. The gas-sensor nanometer sensitive material, the slurry, the preparing and the application have the advantages that the preparing methods are simple, the quantity of introduced foreign ions is small, the yield is high, volume production is facilitated, the specific area of the material is large, dispersity is good, and high sensitivity and short response recovery time are achieved.

Description

technical field [0001] The invention belongs to the field of gas sensors, and in particular relates to a gas sensor nano-sensitive material, its slurry and its preparation and application. Background technique [0002] In recent years, with the increasingly serious problems of environmental ecology and air pollution, it is particularly important to strengthen the detection of the ambient atmosphere. As a commonly used gas detection instrument, gas sensors are widely used to detect various gases. Sensitive materials are the core of gas sensors, which directly determine the performance of gas sensors in practical applications. The semiconductor gas sensor with metal or metal oxide semiconductor as the sensitive layer is the earliest commercialized and most widely used gas sensor. At present, such semiconductor gas sensors generally have outstanding problems such as low sensitivity, slow response recovery, poor selectivity, and low detection limit, which limit their applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00B82Y30/00B82Y40/00
Inventor 刘善堂肖丽余庚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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