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Nano fiber coupling structure gas sensitive material and preparation method and application thereof

A gas-sensitive material and nanofiber technology, applied in nanotechnology, nanotechnology, material resistance, etc., can solve the problems of long response recovery time, poor selectivity, and low sensitivity, and achieve simple and convenient production equipment, improved sensitivity, and low cost Effect

Inactive Publication Date: 2015-03-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the application of people, it is found that although gas sensors play a huge role in many aspects, the existing gas sensors on the market also have shortcomings such as low sensitivity, long response recovery time, large power consumption, and poor selectivity. To a large extent, it is far from meeting the needs of the current electronics industry and production and life, and needs to be further improved.

Method used

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  • Nano fiber coupling structure gas sensitive material and preparation method and application thereof
  • Nano fiber coupling structure gas sensitive material and preparation method and application thereof
  • Nano fiber coupling structure gas sensitive material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] In a 50 mL Erlenmeyer flask, add 0.7 g of polyacrylonitrile (PAN) into 9.3 mL of N,N~dimethylformamide (DMF), stir at 60 °C for 8 h until the solution is completely clear, and cool to room temperature.

[0054] Put the dissolved PAN solution into the spinneret of the electrospinning equipment. The inner diameter of the spinneret head is 1 mm. The aluminum sleeve is used as the anode, and the aluminum foil is used as the cathode plate to receive the product. The distance between the two electrodes is 20 cm. Electrospinning was performed at a voltage of 15 kV. This results in polyacrylonitrile nanofibers on the cathode receiver plate.

[0055] The PAN nanofibers were placed in the air for 20 hours to allow the residual solvent in the fibers to evaporate, and then placed in a tube electric furnace, the temperature was raised to 250 °C at a rate of 5 °C / min, and pre-oxidized in the air atmosphere for 2 h. Nitrogen was introduced into the tube furnace, the temperature was r...

Embodiment 2

[0062] Solution preparation, spinning process and carbon fiber sintering process are consistent with Example 1.

[0063] Take a 100 mL beaker, add 40 mL of 10 mM thioglycolic acid solution, weigh 6 mg of carbon nanofibers into the beaker, and sonicate for 1 h, so that the carbon fibers are evenly dispersed in the solution. Then add 0.1 g SnCl to the beaker 2 , 0.5 mL 37% HCl solution, 0.5 g urea, stirred for 10 min. The mixed solution was transferred to a 60 mL hydrothermal reaction kettle, placed in a constant temperature oven at 120°C for 12 hours, the reaction solution was taken out, and the precipitate was separated, washed and dried.

[0064] The assembly process of the gas sensor is consistent with that of Embodiment 1. The optimal operating temperature of the device is still 200 °C, and the response value to 100 ppm hydrogen at this temperature is 7.2.

[0065] Such as Figure 4 As shown, the SnO prepared in Example 2 2 / The transmission photo of the carbon nanofib...

Embodiment 3

[0067] Solution preparation, spinning process and carbon fiber sintering process are consistent with Example 1.

[0068] Take a 100 mL beaker, add 40 mL of 10 mM thioglycolic acid solution, weigh 6 mg of carbon nanofibers into the beaker, and sonicate for 1 h, so that the carbon fibers are evenly dispersed in the solution. Then add 0.1 g SnCl to the beaker 2 , 0.5 mL 37% HCl solution, 0.5 g urea, stirred for 10 min. The mixed solution was transferred to a 60 mL hydrothermal reaction kettle, placed in a constant temperature oven at 120 °C for 6 hours, the reaction solution was taken out, and the precipitate was separated, washed and dried.

[0069] The assembly process of the gas sensor is consistent with that of Embodiment 1. The optimal operating temperature of the device is still 200 °C, and the response value to 100 ppm hydrogen at this temperature is 4.2.

[0070] Such as Figure 5 Shown, the SnO that embodiment 3 makes 2 / The transmission photo of the carbon nanofib...

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Abstract

The invention provides a nano fiber coupling structure gas sensitive material and a preparation method and application thereof, the gas sensitive material is a one-dimensional coupled structure of carbon nanofibers and nano SnO2, and is based on the carbon nano fibers as a backbone, and a large number of SnO2 nano sheets are grown on the surface by deposition. Polymer nanofibers are obtained by electrostatic spinning, and the carbon nano fibers are prepared by pre oxidation and high temperature carbonization processes, the carbon nano fibers are used as the backbone, the SnO2 nano sheets are subsequently grown and deposited on the surface of the fibers by hydrothermal reaction to obtain a quasi one-dimensional coupled structure nano material, and the quasi one-dimensional coupled structure nano material is assembled into a gas sensor. The hydrogen sensing properties of semiconductor materials are improved, in addition to improvement of the sensitivity, the device operating temperature and response-recovery time are greatly improved, preparation process is simple, the method is convenient to operate and repeat, and the production equipment is simple and convenient, requirement on the production condition is low, production cost is low, and the nano fiber coupling structure gas sensitive material has wide market application prospect and is easy to popularize and use.

Description

[0001] technical field [0002] The invention belongs to the field of nano-semiconductor sensing technology, in particular to a nano-semiconductor material with coupling structure prepared by electrospinning technology combined with hydrothermal synthesis technology, in particular to a gas-sensing material with nanofiber coupling structure and its preparation method and Applications, used to build high-performance hydrogen sensors. Background technique [0003] The development of science and technology has continuously improved the degree of modern industrialization. In recent years, the types and quantities of gases used in the production process and gases generated in the production process have also increased. Many of these gases are flammable, explosive, toxic (such as ethanol, hydrogen, CO, H 2 S, LPG, etc.). Therefore, in order to ensure safe production, it is necessary to strengthen monitoring and management of gas storage, transportation, and use. Therefore, among...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04C01B31/02C01G19/02B82Y30/00
Inventor 王兆杰魏桂涓刘思远姜婷婷李振宇王淑涛安长华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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