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Barium stannate nano-tube gas-sensitive material with high gas sensitive selection on acetic acid gas

A gas-sensitive material, barium stannate technology, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve the problems of long-term consumption and high cost, and achieve the effect of high gas-sensing selectivity

Active Publication Date: 2019-03-19
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the methods for measuring the concentration of acetic acid in the air mainly use gas chromatography and ion chromatography, etc. These methods require relatively expensive instruments and equipment, and sampling and analysis take a long time

Method used

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  • Barium stannate nano-tube gas-sensitive material with high gas sensitive selection on acetic acid gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 0.001 mole of Ba(NO 3 ) 2 and 0.001 molar SnCl 4 ·5H 2 O stirred and dissolved in dimethylformamide (DMF), added polyvinylpyrrolidone (PVP, molecular weight 130000), stirred and dissolved to obtain a solution for electrospinning, the PVP mass percentage in the solution was 15%, Ba(NO 3 ) 2 and SnCl 4 ·5H 2 The sum of O mass accounts for 15% of the solution mass. Add the solution into a medical syringe, connect the needle point and the collecting aluminum foil to a high-voltage power supply, the voltage is 17kV, the needle point is on the top, and the distance between the needle point and the collecting aluminum foil is 13 cm. Under the action of gravity and electric field, stannic acid is collected on the aluminum foil after 4 hours For the precursor of barium nanotubes, the precursor was dried in air at 200°C for 10 minutes, and then heat-treated in a muffle furnace for 2 hours at a temperature of 680°C and a heating rate of 1°C / min.

[0015] The material is mad...

Embodiment 2

[0017] 0.001 mole of Ba(NO 3 ) 2 and 0.001 molar SnCl 4 ·5H 2 O stirred and dissolved in dimethylformamide (DMF), added polyvinylpyrrolidone (PVP, molecular weight 130000), stirred and dissolved to obtain a solution for electrospinning, the PVP mass percentage in the solution was 15%, Ba(NO 3 ) 2 and SnCl 4 ·5H 2 The sum of O mass accounts for 15% of the solution mass. Add the solution into a medical syringe, connect the needle point and the collecting aluminum foil to a high-voltage power supply, the voltage is 18kV, the needle point is on the top, and the distance between the needle point and the collecting aluminum foil is 15 cm. Under the action of gravity and electric field, stannic acid is collected on the aluminum foil after 4 hours For the precursor of barium nanotubes, the precursor was dried in air at 200°C for 10 minutes, and then heat-treated in a muffle furnace for 2 hours at a temperature of 700°C and a heating rate of 1°C / min.

[0018] The material is mad...

Embodiment 3

[0020] 0.001 mole of Ba(NO 3 ) 2 and 0.001 molar SnCl 4 ·5H 2 O stirred and dissolved in dimethylformamide (DMF), added polyvinylpyrrolidone (PVP, molecular weight 130000), stirred and dissolved to obtain a solution for electrospinning, the PVP mass percentage in the solution was 15%, Ba(NO 3 ) 2 and SnCl 4 ·5H 2 The sum of O mass accounts for 15% of the solution mass. Add the solution into a medical syringe, connect the needle point and the collecting aluminum foil to a high-voltage power supply, the voltage is 18kV, the needle point is on the top, and the distance between the needle point and the collecting aluminum foil is 15 cm. Under the action of gravity and electric field, stannic acid is collected on the aluminum foil after 4 hours For the precursor of barium nanotubes, the precursor was dried in air at 200°C for 10 minutes, and then heat-treated in a muffle furnace for 2 hours at a temperature of 720°C and a heating rate of 1°C / min.

[0021] The material is mad...

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Abstract

The invention discloses a barium stannate nano-tube gas-sensitive material with high gas sensitive selection on acetic acid gas, and belongs to the technical field of gas sensitive materials. The material is prepared from barium stannate nano-tubes by an electrospinning method and has a length of about 10-100 microns and radius of 500-1000 nanometers, and the nano-tube wall is formed by barium stannate particles having the average particle size of 50nm. A heater type gas sensitive element prepared by using the material as a sensitive material has the sensitivity on 1000pm acetic acid being 91-96.8, the detection limit on acetic acid being as low as 0.3ppm and the response and recovery time on 0.3-1000ppm acetic acid gas being respectively not more than 50s when the working temperature is 245 DEG C, and has the sensitivity on 1000ppm alcohol and acetone being lower than 6.7 at the same working temperature of 245 DEG C, so that the barium stannate nano-tube gas-sensitive material has high gas sensitive selection on acetic acid gas.

Description

technical field [0001] The invention belongs to the technical field of gas-sensing materials, in particular to a barium stannate nanotube gas-sensing material with high sensitivity and high selectivity to acetic acid gas. Background technique [0002] Acetic acid is a volatile, colorless liquid with a strong pungent smell. It is highly corrosive and can cause skin and mucous membranes to blister, redness, and swelling. When the concentration is high, it can cause rhinitis and bronchitis. In severe cases, acute chemical reactions may occur. pneumonia. The health standard of the United States, Japan and other countries is 25mg / m 3 (about 9.3ppm), my country has not formulated the limit value of acetic acid in the air of the workplace. The current methods for measuring the concentration of acetic acid in the air mainly use gas chromatography and ion chromatography, etc. These methods require relatively expensive instruments and equipment, and sampling and analysis take a long...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 储向峰干正强董永平白林山
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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