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A nanofiber coupling structure gas-sensing material and its preparation method and application

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, low sensitivity, etc., and achieve simple and convenient production equipment, improved sensitivity, and preparation technology. simple effect

Inactive Publication Date: 2016-11-02
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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  • A nanofiber coupling structure gas-sensing material and its preparation method and application
  • A nanofiber coupling structure gas-sensing material and its preparation method and application
  • A nanofiber coupling structure gas-sensing material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In a 50 mL Erlenmeyer flask, add 0.7 g polyacrylonitrile (PAN) to 9.3 mL N,N~dimethylformamide (DMF), stir at 60°C for 8 h until the solution is completely clear, and cool to room temperature.

[0052] 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. The voltage is 15 kV for electrospinning. In this way, polyacrylonitrile nanofibers are obtained on the cathode receiving plate.

[0053] The PAN nanofibers were placed in the air for 20 hours to allow the residual solvent in the fibers to volatilize, and then placed in a tubular electric furnace, heated to 250°C at a rate of 5°C / min, and pre-oxidized in air for 2 hours. Pour nitrogen into the tube furnace, heat up to 289°C at a rate of 1°C / min, and stabilize for 30 minutes; conti...

Embodiment 2

[0060] The solution preparation, spinning process, and carbon fiber sintering process are the same as in Example 1.

[0061] 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 hour to make the carbon fibers uniformly dispersed in the solution. Then add 0.1 g SnCl to the beaker 2 , 0.5 mL 37% HCl solution, 0.5 g urea, stir for 10 min. The mixed solution was transferred to a 60 mL hydrothermal reactor, and 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.

[0062] The assembly process of the gas sensor is the same as in Example 1. The optimal operating temperature of the device is still 200°C, and the response value to 100 ppm hydrogen is 7.2 at this temperature.

[0063] Such as Figure 4 As shown, the SnO prepared in Example 2 2 The transmission photo of the carbon nanofiber coupling structure. It...

Embodiment 3

[0065] The solution preparation, spinning process, and carbon fiber sintering process are the same as in Example 1.

[0066] 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 hour to make the carbon fibers uniformly dispersed in the solution. Then add 0.1 g SnCl to the beaker 2 , 0.5 mL 37% HCl solution, 0.5 g urea, stir for 10 min. The mixed solution was transferred to a 60 mL hydrothermal reactor, and 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.

[0067] The assembly process of the gas sensor is the same as in Example 1. The optimal operating temperature of the device is still 200°C, and the response value to 100 ppm hydrogen is 4.2 at this temperature.

[0068] Such as Figure 5 As shown, the SnO prepared in Example 3 2 / Carbon nanofiber coupling structure. It can be seen that there is SnO...

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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

Technical field [0001] The invention belongs to the technical field of nano-semiconductor sensing, and specifically relates to a nano-semiconductor material with a coupling structure prepared by using electrospinning technology and hydrothermal synthesis technology, and in particular to a gas-sensitive material with a nano-fiber coupling structure and a preparation method thereof. Application, used to construct high-performance hydrogen sensor. Background technique [0002] 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 the gases generated during the production process have also increased. Many of these gases are flammable, explosive, and toxic (such as ethanol, hydrogen, CO, H 2 S, LPG, etc.). Therefore, in order to ensure safe production, it is necessary to strengthen the monitoring and management of gas storage, transportation, and...

Claims

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Application Information

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Patent Type & Authority Patents(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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