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A boron-doped titanium dioxide photo-assisted gas sensor and its preparation method and application

A gas-sensing element and titanium dioxide technology, applied in the field of gas-sensing sensors, can solve the problems of low selectivity, flammability and explosion, poor stability, etc., and achieve the effects of simple preparation method, good gas-sensing response, and stable performance

Active Publication Date: 2020-05-01
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also some problems in the process of use: poor stability, low selectivity, high working temperature, high energy consumption, safety problems, short service life, low intelligence, etc.
[0003] h 2 As a clean energy, it is flammable and explosive, and its production, storage, and use have great safety problems; CO is not only flammable and explosive, but also easily causes great harm to the human body in industrial and indoor environments.

Method used

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  • A boron-doped titanium dioxide photo-assisted gas sensor and its preparation method and application
  • A boron-doped titanium dioxide photo-assisted gas sensor and its preparation method and application
  • A boron-doped titanium dioxide photo-assisted gas sensor and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] TiO 2 and B / TiO 2 Preparation of gas sensor

[0026] Preparation of B / TiO 2 Material: take 1.24g of H 3 BO 3 In a 100ml beaker, add 50ml of deionized water to dissolve, add 7ml of isopropyl titanate dropwise under continuous stirring, stir at room temperature for 12h, bake at 100°C for 12h, and bake at 500°C for 1h.

[0027] Preparation of TiO 2 Materials: Take 50ml of deionized water in a 100ml beaker, add 7ml of isopropyl titanate dropwise under constant stirring, bake at 100°C for 12h, and bake at 500°C for 1h.

[0028] First use deionized water, ethanol, and ultrasonic for 20 minutes to wash the gold interdigitated electrode sheet, and dry it for later use.

[0029] Weigh 30mg of TiO 2 , B / TiO 2 Put the powder into two 1.5ml vials, add 1ml of ethylene glycol dropwise, ultrasonically disperse for 1 hour, use a pipette gun to pipette 50μL and drop it on the cleaned electrode sheet, and dry it at 80°C after it spreads evenly , and finally, place the electrode ...

Embodiment 2

[0039] A kind of preparation method of boron-doped titanium dioxide light-assisted gas sensor

[0040] 1) Under stirring conditions, the H 3 BO 3 The solution was added dropwise in isopropyl titanate, the H 3 BO 3 The ratio of isopropyl titanate to isopropyl titanate was 1 g: 6 mL, stirred at room temperature for 12 h and dried at 100 °C, and the obtained material was calcined at 500 °C to obtain B / TiO 2 powder;

[0041] 2) Use deionized water and ethanol to ultrasonically wash the gold interdigitated electrode sheet for 25 minutes, and dry it for later use;

[0042] 3) Weigh 30mg B / TiO 2 Put the powder in a medicine bottle, and drop 1 mL of ethylene glycol into the ultrasonic dispersion to obtain the gas-sensitive material, then use a pipette gun to pipette 50 μL of the gas-sensitive material and drop it on the surface of the gold finger electrode, wait for it to spread evenly, and place it at 80°C Drying, finally, place the gold interdigitated electrode sheet in a muff...

Embodiment 3

[0044] A kind of preparation method of boron-doped titanium dioxide light-assisted gas sensor

[0045] 1) Under stirring conditions, the H 3 BO 3 The solution was added dropwise in isopropyl titanate, the H 3 BO 3 The ratio of isopropyl titanate to isopropyl titanate is 1 g: 5 mL, stirred at room temperature for 8 h and then dried at 110 °C, and the obtained material was calcined at 400 °C to obtain B / TiO 2 powder;

[0046] 2) Use deionized water and ethanol to ultrasonically wash the gold interdigitated electrode sheet for 20 minutes, and dry it for later use;

[0047] 3) Weigh 30mg B / TiO 2 Put the powder into a medicine bottle, and drop 1 mL of ethylene glycol into the ultrasonic dispersion to obtain the gas-sensitive material, then use a pipette gun to pipette 50 μL of the gas-sensitive material and drop it on the surface of the gold finger electrode, wait for it to spread evenly, and store it at 70°C Drying, finally, place the gold interdigitated electrode sheet in a...

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Abstract

The invention discloses a boron-doped titanium dioxide photo-assisted gas-sensitive element, a preparation method and application. According to the method, a boron doping mode is adopted for modifyingTiO2 and used for preparing the photo-assisted gas-sensitive element, the method is mild in condition and easy to operate, and the prepared B / TiO2 gas-sensitive element shows excellent H2 and CO response performance under the action of ultraviolet light, shows high stability and repeatability, and helps to provide convenience for practical application of semiconductor photo-assisted gas-sensitivesensors.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a boron-doped titanium dioxide light-assisted gas sensor, a preparation method and an application. Background technique [0002] With the development of industry, environmental problems are becoming more and more serious, so the monitoring of toxic, harmful and flammable gases in the air is becoming more and more important. Gas sensors have been widely used in industrial production, home security, environmental detection, medical and health, petrochemical and other fields. Semiconducting metal oxides have the advantages of high sensitivity, short response time, low cost, easy processing, non-toxic and environmentally friendly, so they are the most widely used. At present, the most widely used gas-sensitive materials are mainly n or p-type metal oxides, such as: TiO 2 , ZnO, SnO 2 , WO 3 Wait. However, there are also some problems in the use process: poor stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 戴文新王坤陈旬付贤智员汝胜
Owner FUZHOU UNIV
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