Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A nitrogen-doped metal oxide gas-sensing material, gas-sensing element, preparation method and application thereof

A technology of gas-sensitive materials and oxides, applied in tin oxide, material resistance, analytical materials, etc., can solve problems such as high working temperature, poor selectivity, and limited applications, and achieve high sensitivity, increased quantity, high sensitivity and selectivity Effect

Active Publication Date: 2020-12-25
SHANDONG UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure metal oxides have many shortcomings in low-temperature detection of low-concentration gases, such as low sensitivity, poor selectivity, and high operating temperature, which limit their application in the field of low-temperature gas detection.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A nitrogen-doped metal oxide gas-sensing material, gas-sensing element, preparation method and application thereof
  • A nitrogen-doped metal oxide gas-sensing material, gas-sensing element, preparation method and application thereof
  • A nitrogen-doped metal oxide gas-sensing material, gas-sensing element, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] In another specific embodiment of the present invention, the preparation method of the above-mentioned metal oxide material is provided, including: uniformly mixing a metal salt and a surfactant with an organic solvent, and solvothermally synthesizing a metal oxide precursor material; the metal oxide The precursor material is separated, dried and calcined to obtain metal oxide porous nanospheres.

[0040] In yet another specific embodiment of the present invention, a method for preparing the above-mentioned nitrogen-doped metal oxide gas-sensing material is provided, the method comprising:

[0041] (1) Dissolving the metal salt raw material and the surfactant in an organic solvent; subjecting the obtained clarified liquid to a compound reaction under high temperature and high pressure conditions to obtain a metal oxide precursor.

[0042] (2) The product obtained in step (1) is centrifuged, washed with methanol, dried and then calcined to obtain metal oxide porous nanos...

Embodiment 1

[0064] 1. Nitrogen-doped metal oxide porous nanosphere gas-sensing material and its preparation

[0065] A low-concentration NO 2 Oxygen vacancies modified metal oxide gas sensing materials for gas detection, the metal oxide is SnO 2 Porous nanospheres; SnO 2 The porous nanospheres are placed in a tube furnace, calcined at different temperatures in an atmosphere of nitrogen provided by a nitrogen source, and the surface of the metal oxide is subjected to different degrees of nitrogen doping treatment. The nitrogen-doped metal oxide is a porous nanosphere composed of small particles, the diameter of the ball is 300-700nm, and the particle size is 10-30nm.

[0066] Preparation steps:

[0067] (1) Add 0.42g of tin tetrachloride and 0.5g of polyvinylpyrrolidone into 60ml of methanol solution and stir until they are completely dissolved. The stirred clear liquid is placed in a high-pressure reactor and heated to 180°C for 3 hours. A compound reaction occurs under high pressure,...

Embodiment 2

[0076] Example 2 Gas-sensitive detection of nitrogen-doped metal oxides prepared by calcining at different temperatures under the condition that the nitrogen-containing source provides nitrogen

[0077] As described in Example 1, the difference is that the calcination temperature of the metal oxide porous nanospheres in the nitrogen-containing atmosphere in step (1) is 100°C, 300°C and 400°C. At 80℃, 5ppm NO 2 Gas sensitivity test results under gas conditions are as follows: Figure 7 As shown, it can be seen from the figure that with the increase of calcination temperature, the gas-sensing properties of nitrogen-doped metal oxide materials have certain changes, but they are all sensitive to 5ppm NO at 80°C. 2 Gas has a relatively good response, and its response range is 39-88.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
sizeaaaaaaaaaa
diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a nitrogen-doped metal oxide gas-sensitive material, a nitrogen-doped metal oxide gas-sensitive element, and a preparation method and application of the nitrogen-doped metal oxide gas-sensitive material and the nitrogen-doped metal oxide gas-sensitive element, and belongs to the technical field of gas-sensitive materials. The nitrogen-doped metal oxide gas-sensitive materialis obtained by surface nitrogen-doping treatment of a metal oxide, the gas-sensitive material is a porous nanosphere composed of small particles, a diameter of the porous nanosphere is 300-700 nm, and a size of the small particles is 10-30 nm. The nitrogen-doped metal oxide gas-sensitive material is obtained by performing surface nitrogen-doping treatment at different temperatures under a nitrogen atmosphere provided by a nitrogen source, a doping concentration is adjustable, and the preparation method is convenient and simple. The gas-sensitive element is prepared by the gas-sensitive material, studies show that the gas-sensitive element has high response value and good selectivity to low-concentration NO2 gas at a relatively low temperature, and thereby the gas-sensitive element has good practical application value.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, and in particular relates to a nitrogen-doped metal oxide gas-sensing material, a gas-sensing element and a preparation method and application thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the development of science and technology and the continuous improvement of people's living standards, industrial waste gas and domestic waste gas (such as NO 2 , SO 2 、H 2 S, CO, etc.) emissions are also increasing day by day, and the environmental pollution problems (such as smog, acid rain, greenhouse effect, etc.) that people are facing are also becoming more and more seri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01G19/02G01N27/12
CPCC01G19/02C01P2002/70C01P2002/72C01P2004/03C01P2004/04G01N27/127
Inventor 刘久荣杜文静吴莉莉刘伟王凤龙汪宙王琦陈国文
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com