A sro-doped sno 2 base nh 3 Sensitive material preparation method

A technology of sensitive materials and sensitive components, which is applied in the direction of material resistance, material analysis, and material analysis through electromagnetic means, can solve the problems of unclear influence on gas-sensing performance, and achieve improved gas-sensing performance, high yield, and increased active site effect

Active Publication Date: 2020-09-08
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, few studies have focused on the application of SrO in gas sensors, and strontium oxide doping on SnO 2 The influence of the gas-sensing properties of base-sensitive materials is not yet clear

Method used

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  • A sro-doped sno <sub>2</sub> base nh <sub>3</sub> Sensitive material preparation method
  • A sro-doped sno <sub>2</sub> base nh <sub>3</sub> Sensitive material preparation method

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Embodiment 1

[0037] SrO doped SnO 2 Preparation of NH from sensitive materials 3 sensor

[0038]Dissolve 1g of cetyltrimethylammonium bromide in 100ml of 8mol / L nitric acid solution, stir evenly, add 5g of tin particles, stir in a water bath at 75°C to make the tin particles react completely, then put After the generated precipitate was separated, washed and dried, it was sintered at 500 °C for 3 hours to obtain SnO 2 nanoparticles. 0.3g of SrCO 3 Dissolve in 20ml of dilute hydrochloric acid, stir well and add 1g of SnO 2 nanoparticles. Under the hydrothermal condition of 90 °C, the magnetic stirring was continued, and the solution was evaporated to dryness to obtain strontium-loaded SnO 2 nanoparticles, and then heat-treated at 450 °C for 2 h to obtain SrO-supported SnO 2 sensitive material. Mix the sensitive material with deionized water and alcohol at a mass ratio of 1:0.5:0.5, and evenly coat the surface of the ceramic tube. After drying, weld the working electrode and the heat...

Embodiment 2

[0040] SrO doped SnO 2 Preparation of NH from sensitive materials 3 sensor

[0041] Dissolve 2g of cetyltrimethylammonium bromide in 100ml of 8mol / L nitric acid solution, stir evenly, add 5g of tin particles, stir in a water bath at 75°C to make the tin particles react completely, then put After the generated precipitate was separated, washed and dried, it was sintered at 500 °C for 3 hours to obtain SnO 2 nanoparticles. 0.3g of SrCO 3 Dissolve in 20ml of dilute hydrochloric acid, stir well and add 1g of SnO 2 nanoparticles. Under the hydrothermal condition of 90 °C, the magnetic stirring was continued, and the solution was evaporated to dryness to obtain strontium-loaded SnO 2 nanoparticles, and then heat-treated at 450 °C for 2 h to obtain SrO-supported SnO 2 sensitive material. Mix the sensitive material with deionized water and alcohol at a mass ratio of 1:0.5:0.5, and evenly coat the surface of the ceramic tube. After drying, weld the working electrode and the hea...

Embodiment 3

[0045] SrO doped SnO 2 Preparation of NH from sensitive materials 3 sensor

[0046] Dissolve 3g of cetyltrimethylammonium bromide in 100ml of 8mol / L nitric acid solution, stir evenly, add 5g of tin particles, stir in a water bath at 75°C to make the tin particles react completely, then put After the generated precipitate was separated, washed and dried, it was sintered at 500 °C for 3 hours to obtain SnO 2 nanoparticles. 0.3g of SrCO 3 Dissolve in 20ml of dilute hydrochloric acid, stir well and add 1g of SnO 2 nanoparticles. Under the hydrothermal condition of 90 °C, the magnetic stirring was continued, and the solution was evaporated to dryness to obtain strontium-loaded SnO 2 nanoparticles, and then heat-treated at 450 °C for 2 h to obtain SrO-supported SnO 2 sensitive material. Mix the sensitive material with deionized water and alcohol at a mass ratio of 1:0.5:0.5, and evenly coat the surface of the ceramic tube. After drying, weld the working electrode and the hea...

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Abstract

The invention provides a synthesis method of using a SrO-doped nano SnO2 material for preparing an NH3 sensitive material. The method uses cetyl trimethyl ammonium bromide as a surfactant, prepares SnO2 nano-particles by adopting a tin-particle nitric acid oxidation method, then carries out doping modification on a SnO2 matrix with SrO, and prepares the NH3 sensitive material. The doping of the SrO in the preparation method is proved to have a good promoting effect on NH3 gas sensitive response of the SnO2-based sensitive material. The addition of the SrO can significantly enhance the surfacealkalinity of the sensitive material and increase the number of strong alkali sites, and the SrO can form heterojunctions with SnO2. Therefore, after SrO doping, the sensitivity of the material is significantly enhanced, and the sensitive material with high response value of NH3 is obtained. A prepared NH3 sensor can realize rapid and highly sensitive detection of NH3, and has broad application prospects in NH3 detection.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor-based gas sensors and environmental monitoring, in particular to a SnO doped with SrO 2 NH 3 Methods of preparation of sensitive materials. Background technique [0002] Gas sensors can quickly and quickly detect harmful gases, and play an irreplaceable role in controlling poisoning, fire, leakage, etc. As a hot spot and an important research object in the high-tech field, gas sensors also have many disadvantages at present. For example, they have no good selectivity for target gases in complex environments, are greatly affected by the surrounding environment, and have good stability. In contrast, nano-tin dioxide gas-sensitive material sensors have excellent gas-sensing properties for many harmful gases, so nano-tin dioxide gas-sensitive sensors have always been the focus of research. However, there are still many problems in pure tin dioxide gas sensors, such as low sensitiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12B82Y15/00B82Y30/00
CPCB82Y15/00B82Y30/00G01N27/127
Inventor 徐浩元李建中付玉李培东
Owner NORTHEASTERN UNIV LIAONING
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