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Experimental apparatus and method for testing gas-sensitive temperature characteristic of carbon nanotube sensor

A technology of carbon nanotubes and temperature characteristics, applied in the direction of material resistance, etc., can solve the problems of inability to test the gas-sensing temperature characteristics of carbon nanotube sensors, uncontrollable gas flow rate to be detected, and low temperature control accuracy, and achieve flexible and convenient testing. The effect of fast detection and improved sensitivity

Inactive Publication Date: 2012-11-28
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this patent are: ①The temperature control of the sensor in the disclosed device is to control the on-off and heating time of the electric furnace through the opening and closing of the AC contactor. This method controls the temperature time slowly and the temperature control accuracy is low; ②The disclosed There is no gas flow controller in the device, and the flow rate of the detected gas passing into the device cannot be controlled; ③The disclosed method only tests the gas-sensing temperature characteristics of the carbon nanotube sensor when the detected gas is static, and cannot measure the temperature of the detected gas. To test the gas-sensing temperature characteristics of the carbon nanotube sensor during dynamic time, the accuracy is poor

Method used

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  • Experimental apparatus and method for testing gas-sensitive temperature characteristic of carbon nanotube sensor
  • Experimental apparatus and method for testing gas-sensitive temperature characteristic of carbon nanotube sensor

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, an experimental device for measuring the gas-sensing temperature characteristics of a carbon nanotube sensor mainly includes a quartz glass tube 1, a gas flow meter 19, a ceramic heating plate 4, a thermal resistance probe 2, an AC voltage regulator 16, and a digital display thermometer 17. Vacuum pump 8, impedance analyzer 18, etc. The feature is that the material of the quartz glass tube 1 is quartz glass, and the shape of the quartz glass tube 1 is cylindrical with a wall thickness of 4mm, an inner diameter of 35mm, and a length of 150mm. Quartz glass flanges 13 with an inner diameter of 35 mm, an outer diameter of 50 mm and a thickness of 4 mm are fixedly connected to both ends of the quartz glass tube 1 . The quartz glass flange 13 is fixedly connected to the stainless steel sealing piece 22 through the bolt 14 and the O-ring 12, so as to form a closed space in the quartz glass tube 1, so that the measured gas in the quartz glass tube 1 ...

Embodiment 2

[0032] An experimental device for measuring the gas-sensitive temperature characteristics of a carbon nanotube sensor, the same as in Example 1, wherein: the wall thickness of the quartz glass tube 1 is 5 mm, the inner diameter is 40 mm, and the length is 170 mm; the inner diameter of the quartz glass flange 13 is 40 mm, and the outer diameter is 40 mm. The diameter is 60mm, the thickness is 5mm; the length of the quartz glass block 11 is 13mm, the width is 13mm, and the height is 23mm; the length of the ceramic heater 4 is 33mm, the width is 33mm, the thickness is 2mm, and the power is 300W; The diameters of the first through hole and the second through hole on the stainless steel sealing sheet 22 at the end are both 5mm.

Embodiment 3

[0034] An experimental device for measuring the gas-sensitive temperature characteristics of a carbon nanotube sensor, the same as in embodiment 1, wherein: the wall thickness of the quartz glass tube 1 is 6 mm, the inner diameter is 45 mm, and the length is 200 mm; the inner diameter of the quartz glass flange 13 is 45 mm, and the outer diameter is 45 mm. The diameter is 65mm, the thickness is 6mm; the length of the quartz glass block 11 is 15mm, the width is 15mm, and the height is 25mm; the length of the ceramic heater 4 is 35mm, the width is 35mm, the thickness is 3mm, and the power is 350W; The diameters of the first through hole and the second through hole on the stainless steel sealing sheet 22 at the end are both 6mm.

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Abstract

An experimental apparatus and a method for testing gas-sensitive temperature characteristics of a carbon nanotube sensor belong to the technical field of nanotube sensor characteristic test. The apparatus of the invention mainly comprises a quartz glass tube, a gas flow indicator, ceramic heating plates, a thermal resistor probe, an AC voltage regulator, a digital display thermometer, an impedance analyzer and a vacuum pump, etc. The method of the invention utilizes the apparatus to test the gas-sensitive temperature characteristics of the carbon nanotube sensor to be tested to different gases, at different flow velocities and different temperatures. The invention has characteristics of flexible and convenient detection, high reliability, high precision, good security, simpleness, convenience and easiness for popularization and application. The invention can be widely applied to test analysis and application of gas-sensitive temperature characteristics of the carbon nanotube sensor inscientific research, teaching and manufacture.

Description

technical field [0001] The invention belongs to the technical field of characteristic testing of carbon nanotube sensors, and in particular relates to an experimental device and method for testing gas-sensing temperature characteristics of carbon nanotube sensors with a dynamic method. Background technique [0002] The use of carbon nanotubes to make miniature gas sensors has the advantages of fast response, high sensitivity, low operating temperature, and small size. In recent years, some scholars have applied carbon nanotubes to the field of sensors, especially for gas detection, and have made great progress. . The gas sensor is to detect the gas by using the adsorption or chemical reaction between the gas molecules to be measured and the surface of the gas sensitive layer of the sensor to cause charge transfer, which in turn leads to changes in the electrical characteristics of the sensor. [0003] Adsorption or chemical reaction between the detected gas and carbon nanot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/12
Inventor 张晓星唐炬张锦斌李剑姚陈果陈伟根
Owner CHONGQING UNIV
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