Experimental device of gas-sensitive temperature property test of carbon nano tube sensor and method

Abstract

An experimental device of gas-sensitive temperature property test of a carbon nano tube sensor and a method belong to the technical field of property test of the carbon nano tube sensor. The device mainly includes a cylinder, a vacuum pump, an alternating current contactor, a digital display regulator, an electric stove, a thermal resistor, an impedance analyzer and the like. By using the device, the method conducts the gas-sensitive temperature property test of the carbon nano tube on different detection gases at different temperatures. The device and the method can measure the gas-sensitive temperature property of the carbon nano tube sensor under different defected gases, find out the optimal working temperature of the carbon nano tube sensor under defected gases, have high accuracy and sensitivity of measurement, convenient operation and easy promotion and application, and the method is simple. The device and the method can be widely applied to the analysis and application of the gas-sensitive temperature property of carbon nano tube sensors for scientific research, teaching and study institutions.

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. 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. The adsorption or chemical reaction between the detected gas and carbon nanotubes must be realized at a ...

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Problems solved by technology

[0003] Existing carbon nanotube sensor gas-sensing temperature characteristics testing device, such as "Research on the gas-sensing properties of multi-walled carbon nanotubes" in "Vacuum Science and Technology" in September and October, 2003, Volume 23, No. 5, uses The experimental device consists of a 250ml airtight glass container, a 500ml quartz glass tube, a four-probe tester and a thermocouple. The N 2 and O 2 The main disadvantages of this device are: the lack of temperature regulation part, the temperature cannot be controlled in real time, so the test accuracy is low, and the temperature characteristics of carbon nanotubes in vacuum cannot be tested at the same time

Another example is the article "Research on Gas Sensitivity of Sensors Based on Multi-walled Carbon Nanotubes to Toluene" in "Journal of Sensing Technology", Volume 18, Issue 1, March 2005. The experimental device used consists of a closed air chamber, an air inlet valve , gas outlet valve, syringe and electrochemical analyzer, this device can only test the gas sensitivity of carbon nanotubes, not its temperature characteristics

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