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Gas sensor based on polyaniline/stannic oxide composite nanofibers and preparation method thereof

A composite nanofiber, gas sensor technology, used in instruments, scientific instruments, measuring devices, etc., can solve the problem of difficult-to-control gas-sensitive materials in contact with sensor substrates, thick (several microns to hundreds of microns, and poor consistency of gas-sensitive sensors) and other problems, to achieve the effect of easy development and application, large specific surface area, and improved response sensitivity

Inactive Publication Date: 2016-06-08
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation methods are relatively complicated, and the preparation process is difficult to control. The combination between the organic / inorganic nanocomposite gas-sensitive material and the substrate of the sensor is not good enough, and the film of the composite gas-sensitive material is usually thick (several microns to hundreds of microns), which is difficult. Controlling the contact between the gas-sensing material and the sensor substrate leads to poor consistency of the gas-sensing sensor, and organic / inorganic nanocomposite gas-sensing materials are difficult to process because they are insoluble and infusible, which also limits the application of this composite material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Dissolve 0.15g of intrinsic polyaniline, 0.1g of camphorsulfonic acid, and 0.15g of polystyrene in 50mL of chloroform to obtain solution A;

[0024] 2) 0.15gSnCl 2 2H 2 O was dissolved in 10 mL of ethanol to obtain solution B;

[0025] 3) After stirring and mixing solution A and solution B evenly, put them into the spinning device, the spinning working distance is 8cm, turn on the high-voltage power supply, adjust the spinning voltage to 15kV, and the receiving time is 10min, and the spinning solution is passed through electrospinning Depositing composite nanofibers on ceramic substrates with interdigitated microelectrodes by wire method;

[0026] 4) The substrate deposited with composite nanofibers prepared in step 3) was dried and hydrothermally treated at 140° C. for 10 hours to obtain a gas sensor based on polyaniline / tin dioxide composite nanofibers. Gained gas sensor has better detection effect for ammonia, under 10ppm ammonia concentration, utilize formula ...

Embodiment 2

[0028] 1) Dissolve 0.5g of intrinsic polyaniline, 0.4g of dodecylbenzenesulfonic acid, and 0.3g of polystyrene in 50mL of dimethylformamide to obtain solution A;

[0029] 2) 0.3gSnCl 2 2H 2 O was dissolved in 10 mL of ethanol to obtain solution B;

[0030] 3) After mixing solution A and solution B evenly, put them into the spinning device, the spinning working distance is 12cm, turn on the high-voltage power supply, adjust the spinning voltage to 20kV, and the receiving time is 20min, and the spinning solution is passed through electrospinning Depositing composite nanofibers on a glass substrate with interdigitated microelectrodes by a silk method;

[0031] 4) The substrate deposited with the composite nanofibers prepared in step 3) was dried and hydrothermally treated at 130° C. for 8 hours to obtain a gas sensor based on polyaniline / tin dioxide composite nanofibers. The obtained gas sensor has good detection effect on ammonia gas, and its sensitivity S=65% at the concentr...

Embodiment 3

[0033] 1) Dissolve 0.6g of intrinsic polyaniline, 0.4g of p-toluenesulfonic acid, and 0.3g of polystyrene in 50mL of chloroform to obtain solution A;

[0034] 2) 0.4gSnCl 2 2H 2 O was dissolved in 10 mL of ethanol to obtain solution B;

[0035] 3) After mixing solution A and solution B evenly, put them into the spinning device, the spinning working distance is 15cm, turn on the high-voltage power supply, adjust the spinning voltage to 12kV, and the receiving time is 15min, and the spinning solution is passed through electrospinning The silk method deposits composite nanofibers on polyethylene terephthalate substrates with interdigitated microelectrodes on the surface;

[0036] 4) The substrate deposited with the composite nanofibers prepared in step 3) was dried and hydrothermally treated at 100° C. for 12 hours to obtain a gas sensor based on polyaniline / tin dioxide composite nanofibers. The obtained gas sensor has good detection effect on ammonia gas, and its sensitivity ...

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Abstract

The invention discloses a gas sensor based on polyaniline / stannic oxide composite nanofibers and a preparation method thereof. The gas sensor comprises a substrate, an interdigitated microelectrode and a gas sensitive material. The gas sensitive material is polyaniline / stannic oxide composite nanofibers prepared through the combination of electrostatic spinning and a low-temperature hydrothermal method. The structure of the nanofibers obtained through electrostatic spinning has the large specific surface area, the active sites of adsorption of the gas sensitive material and gas are added, metal salts contained in the nanofibers processed through the low-temperature hydrothermal method are converted into nano-structure stannic oxide in situ, and the gas response sensitivity, resilience and stability of the sensor under the room temperature are improved due to the p-n junction formed by p-type polyaniline and n-type stannic oxide. The preparation method of the gas sensor is simple, no complex equipment is needed, the reaction temperature is low, and the gas sensor is suitable for large-scale production.

Description

technical field [0001] The invention relates to a gas sensor based on polyaniline / tin dioxide composite nanofiber and a preparation method thereof, belonging to the field of functional materials and sensors. Background technique [0002] With the development of human society, environmental issues have been widely concerned by people, and the detection and treatment of air quality is one of the important issues. The gas sensor is a device specially designed to detect the type and content of gas in the environment, and its core is a high-quality gas-sensitive material. The development of high-performance, low-cost, and small-sized gas-sensing materials has a profound impact on the development and application of gas-sensing sensors. [0003] Traditional gas-sensing materials are divided into two categories: inorganic metal oxide semiconductor materials and organic conductive polymers. Inorganic metal oxide semiconductors have high response sensitivity and good repeatability, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 李亮郑华明刘仿军刘玉兰
Owner WUHAN INSTITUTE OF TECHNOLOGY
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