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Photosensitization type porous tin oxide composite material and synthetic method thereof, and environmental sensor

A technology for environmental sensors and composite materials, applied in the field of photo-sensitized porous tin oxide composite materials, environmental sensors, and their synthesis, can solve problems such as low sensitivity and physical health hazards, and achieve reduced diffusion resistance, improved sensitivity, and excellent The effect of gas-sensing properties

Active Publication Date: 2020-03-20
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, NO 2 Although the gas exists in the environment at a lower concentration, the low concentration of NO 2 Gas has great harm to human health, so fast, accurate and effective detection of NO 2 Gas has become a hot topic for gas sensors
[0003] Although, semiconductor SnO 2 It is an important member of metal oxides, which has high chemical stability, excellent optical and electrical properties, and can be used for NO 2 gas sensors; however, existing SnO-based 2 Material NO 2 Gas sensors need to work at high temperatures, and they also have problems such as low sensitivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This embodiment provides a porous tin oxide composite material and a gas sensor made from the composite material, wherein the synthesis method of the porous tin oxide composite material comprises the following steps:

[0027] (1) Dissolve 1.0g of P123 and 3.51g of tin tetrachloride in water and stir to obtain a precursor solution.

[0028] (2) Adjust the pH value of the precursor solution to 8.0 with ammonia water, heat at 45°C and stir for 4 hours, then place it in a hydrothermal synthesis reactor and keep it at 100°C for two days for hydrothermal synthesis reaction to obtain a gel.

[0029] (3) Mix the obtained gel with 100 ml of 4% ammonium acetate solution, centrifuge and wash and dry with deionized water to obtain the first precipitate.

[0030] (4) Soak the first precipitate with a sulfuric acid solution with a molar concentration of 3.0 mol / L, then wash and dry in sequence, and then keep the dried first precipitate in air at 500°C for calcination for 3 hours , t...

Embodiment 2

[0037] This embodiment provides a porous tin oxide composite material and a gas sensor made from the composite material, wherein the synthesis method of the porous tin oxide composite material comprises the following steps:

[0038] (1) Dissolve 1.g P123 and 3.51g tin tetrachloride in water, and stir to obtain a precursor solution.

[0039] (2) Adjust the pH value of the precursor solution to 9 with ammonia water, then heat it and store it in a hydrothermal synthesis reactor for two days for hydrothermal synthesis reaction to obtain a gel.

[0040] (3) The gel was mixed with a 5% ammonium acetate solution, centrifuged, washed and dried with deionized water, and the first precipitate was obtained.

[0041] (4) Soak the first precipitate with a molar concentration of 4mol / L sulfuric acid solution, then wash and dry in sequence, then, the dried first precipitate is calcined in air to obtain tin dioxide powder ; Wherein, the volume mass ratio of the acid solution and the first pr...

Embodiment 3

[0048]This embodiment provides a porous tin oxide composite material and a gas sensor made from the composite material, wherein the synthesis method of the porous tin oxide composite material comprises the following steps:

[0049] (1) Dissolve 1.0g of P123 and 3.51g of tin tetrachloride in water and stir to obtain a precursor solution.

[0050] (2) Adjust the pH value of the precursor solution to 8 with ammonia water, then heat it and place it in a hydrothermal synthesis reactor for storage at 100° C. for two days for hydrothermal synthesis reaction to obtain a gel.

[0051] (3) The gel was mixed with 100 ml of 4% ammonium acetate solution, centrifuged, washed and dried with deionized water, and the first precipitate was obtained.

[0052] (4) Soak the first precipitate with a molar concentration of 2mol / L sulfuric acid solution, then wash and dry in sequence, then, the dried first precipitate is calcined in air to obtain tin dioxide powder ; Wherein, the volume mass ratio o...

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Abstract

The invention discloses a photosensitization type porous tin oxide composite material and a synthetic method thereof, and an environmental sensor, belonging to the technical field of chemical engineering and sensors. The synthetic method of the porous tin oxide composite material comprises the following steps: preparing a first precipitate from P123, tin tetrachloride and an ammonium acetate solution; soaking the first precipitate with an acid solution, and then sequentially carrying out cleaning, drying and calcining treatment to obtain tin dioxide powder; preparing a second precipitate frombutyl titanate, cyclohexane, hydrochloric acid and ethanol; drying the second precipitate to obtain titanium dioxide powder; and mixing the tin dioxide powder and the titanium dioxide powder to obtainthe porous tin oxide composite material. When the porous tin oxide composite material is used for preparing a nitrogen dioxide gas sensor, the sensitivity of the gas sensor can be greatly improved, and the response recovery time of the gas sensor is shortened.

Description

technical field [0001] The invention relates to the fields of chemical technology and sensor technology, in particular to a light-sensitized porous tin oxide composite material, a synthesis method thereof and an environmental sensor. Background technique [0002] Gas sensors are mainly used for the detection of various gases, especially ambient gases. The requirement for pollution control of toxic and harmful gases in the environment has accelerated the research of gas sensors. In the prior art, it is mainly used in the detection of CO gas, the detection of VOCs gas, the monitoring of formaldehyde, and the detection of NO 2 Effective monitoring of gas and so on. It converts the information related to the gas type and its concentration into electrical signals, so that it can be detected, monitored, and alarmed; it can also form an automatic detection, control, and alarm system through an interface circuit and a computer. Among them, NO 2 Although the gas exists in the env...

Claims

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Application Information

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IPC IPC(8): C01G23/053C01G19/02G01N27/12
CPCC01G23/053C01G19/02G01N27/125Y02A50/20
Inventor 孙鉴波苗佳宇
Owner HARBIN NORMAL UNIVERSITY
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