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Gas sensitive material and preparation method and application thereof

A gas-sensitive material and sediment technology, which is applied in the direction of analyzing materials, material resistance, and material analysis through electromagnetic means, can solve the problems of high concentration detection limit and low sensitivity, and achieve simple and easy control of the preparation process, excellent sensitivity and The effect of accuracy

Inactive Publication Date: 2015-01-28
WUHAN INSTITUTE OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core of the semiconductor gas sensor is the gas sensitive material, the most mature sensitive material currently used is SnO 2 , SnO 2 It responds to most VOCs gases, but its low sensitivity and high detection limit limit its further application.

Method used

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  • Gas sensitive material and preparation method and application thereof
  • Gas sensitive material and preparation method and application thereof
  • Gas sensitive material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) to 0.5mol / L SnCl 4 ·5H 2 Add ammonia water with a mass percentage concentration of 20% in the O aqueous solution, stir vigorously at 50°C until the solution pH=10, and obtain a precipitate and a mother liquor, age the precipitate in the mother liquor at 50°C for 5 hours, centrifuge after aging, and wash with distilled water until The filtrate is neutral, the precipitate is dried at 80°C for 12h, and the dried product is calcined at 800°C in air for 5h to obtain submicron SnO 2 .

[0033] (2) 0.2mol / L SnCl 4 ·5H 2 40ml of aqueous O solution was placed in a hydrothermal reaction kettle, and the precipitate and mother liquor were obtained after reacting at 160°C for 12 hours. After the reaction kettle was naturally cooled, the precipitate was centrifuged and washed with distilled water until the filtrate was washed with AgNO 3 Cl cannot be detected - , the precipitate was dried at 80 °C for 12 h to obtain nanoscale SnO 2 .

[0034] (3) Submicron and nanoscale Sn...

Embodiment 2

[0039] (1) To 1mol / L SnCl 4 ·5H 2 Add ammonia water with a mass percentage concentration of 20% in the O aqueous solution, stir vigorously at 50°C until the solution pH=10, and obtain a precipitate and a mother liquor, age the precipitate in the mother liquor at 50°C for 5 hours, centrifuge after aging, and wash with distilled water until The filtrate is neutral, the precipitate is dried at 80°C for 12h, and the dried product is calcined at 800°C in air for 5h to obtain submicron SnO 2 .

[0040] (2) 0.4mol / L SnCl 4 ·5H 2 40ml of aqueous O solution was placed in a hydrothermal reaction kettle, and the precipitate and mother liquor were obtained after reacting at 160°C for 12 hours. After the reaction kettle was naturally cooled, the precipitate was centrifuged and washed with distilled water until the filtrate was washed with AgNO 3 Cl cannot be detected - , the precipitate was dried at 80 °C for 12 h to obtain nanoscale SnO 2 .

[0041] (3) Submicron and nanoscale SnO ...

Embodiment 3

[0044] (1) To 1mol / L SnCl 4 ·5H 2 Add ammonia water with a mass percentage concentration of 20% in the O aqueous solution, stir vigorously at 50°C until the solution pH=10, and obtain a precipitate and a mother liquor, age the precipitate in the mother liquor at 80°C for 5 hours, centrifuge after aging, and wash with distilled water until The filtrate is neutral, the precipitate is dried at 80°C for 12h, and the dried product is calcined at 1000°C in air for 5h to obtain submicron SnO 2 .

[0045] (2) 0.4mol / L SnCl 4 ·5H 2 40ml of aqueous O solution was placed in a hydrothermal reaction kettle, and the precipitate and mother liquor were obtained after reacting at 120°C for 12 hours. After the reaction kettle was naturally cooled, the precipitate was centrifuged and washed with distilled water to the filtrate, and the AgNO 3 No Cl- was detected, and the precipitate was dried at 80°C for 12h to obtain nanoscale SnO 2 .

[0046] (3) Submicron and nanoscale SnO 2 Ultrasonic...

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Abstract

The invention relates to a gas sensitive material capable of detecting a volatile organic compound and a preparation method of the gas sensitivity material. The preparation method of the gas sensitive material comprises the following steps: 1) adding ammonium hydroxide in a SnCl4.5H2O water solution to obtain a precipitate and a mother solution, ageing, centrifuging, washing, drying the precipitate, and roasting the product in air to obtain submicron-order SnO2; 2) placing the SnCl4.5H2O water solution in a hydrothermal reaction kettle, after naturally cooling the reaction kettle, centrifuging the precipitate, washing, and drying the precipitate to obtain nano-order SnO2; and 3) ultrasonically dispersing the submicron-order SnO2 and the nano-order SnO2 in distilled water, adding Na2PdCl4, adding ammonium hydroxide to obtain a precipitate and a mother solution, centrifuging the precipitate, washing, and drying the precipitate to obtain the gas sensitive material. The gas sensitive material has the advantages of having excellent sensitivity and accuracy, being simple and easy to control and free from toxicity in a preparation process, and being suitable for detecting the quality of air in a room and a vehicle.

Description

technical field [0001] The invention relates to a gas-sensitive material for detecting volatile organic compounds (VOCs) and its preparation, belonging to the field of material preparation and application. Background technique [0002] Volatile organic compounds (volatile organic compounds) refer to volatile organic compounds whose melting point is lower than room temperature and boiling point is between 50°C and 260°C. VOCs are widely found in building materials, interior decoration materials, and daily life and office supplies in buildings and cars. When the concentration of volatile organic compounds in the air is too high, it is easy to cause acute poisoning. Headache, dizziness, cough, nausea, vomiting, or drunkenness; severe cases may cause liver poisoning or even coma, which may also be life-threatening. Long-term living indoors polluted by volatile organic compounds can cause chronic poisoning, and even cause cancers such as leukemia. Foreign medical research has c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00G01N27/04C01G19/02
Inventor 刘善堂余庚
Owner WUHAN INSTITUTE OF TECHNOLOGY
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