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Online gas detection device based on carbon-nano-tube membrane micron-nano electrode

A technology of carbon nanotube thin film and detection device, which is applied in measuring devices, electric devices, thermometers using electric/magnetic elements directly sensitive to heat, etc., can solve the problem of multi-valued nonlinearity of gas-sensing characteristics and humidity-sensing characteristics , Can not constitute an online detection device, not suitable for flammable and explosive gases, etc., to achieve the effect of high practical value

Inactive Publication Date: 2012-11-28
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] At present, the on-line detection device based on carbon nanotube film two-electrode gas sensor mostly uses two electrodes, cathode and anode, to form a gas sensor. Both the gas-sensing characteristics and the humidity-sensing characteristics have multi-valued nonlinear problems, and cannot constitute a practical on-line detection device.
[0008] 3. Not suitable for the measurement of flammable and explosive gases
[0009] At present, carbon nanotube film two-electrode ionization gas sensors mostly work in the state of corona discharge, arc discharge, etc. During the discharge process, a large current is generated, accompanied by the phenomenon of luminescence and heat generation, so it is not suitable for the measurement of flammable and explosive gases

Method used

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  • Online gas detection device based on carbon-nano-tube membrane micron-nano electrode
  • Online gas detection device based on carbon-nano-tube membrane micron-nano electrode
  • Online gas detection device based on carbon-nano-tube membrane micron-nano electrode

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Effect test

Embodiment 1

[0041] The carbon nanotube film micro-nano electrode sensor array 1 of the gas on-line detection device is composed of a carbon nanotube sensor with fixed electrode spacing and different values ​​between two adjacent electrodes among the three electrodes, and the first electrode 11 has two air holes 1. There is one lead-out hole for the second electrode 12 , and one blind hole for the third electrode 13 . Carbon nanotube film micro-nano electrode sensor structure such as image 3 shown.

[0042] Using the above-mentioned carbon nanotube film micro-nano electrode sensor with fixed pole spacing, the single-valued gas-sensing characteristics of a single gas sulfur dioxide were experimentally obtained ( Figure 4 As shown), the ion current data output by the sensor is input into the data fusion to establish a single gas sulfur dioxide concentration measurement model, and the measurement value of the single gas sulfur dioxide concentration with an accuracy of less than 1% is obtai...

Embodiment 2

[0045] The carbon nanotube film micro-nano electrode sensor array 1 of the gas online detection device is composed of a carbon nanotube sensor with a fixed electrode spacing of 170 μm between two adjacent electrodes among the three electrodes, and the first electrode 11 has 2 air holes, There is one lead-out hole for the second electrode 12 , and one blind hole for the third electrode 13 .

[0046] Using the above-mentioned carbon nanotube sensor with fixed pole spacing, the experiment obtained the single-value temperature characteristics in the air ( Figure 5 Shown), the temperature measurement model established by the fusion of the ion current input data output by the sensor obtains the temperature measurement value in the air with an accuracy of less than 1%.

[0047] Figure 5 In the embodiment shown in which the gas online detection device detects the air ambient temperature, the experimental environmental conditions are relative humidity of 25.7%RH and atmospheric pres...

Embodiment 3

[0049] The carbon nanotube film micro-nano electrode sensor array 1 of the gas on-line detection device is composed of a carbon nanotube sensor with fixed electrode spacing and different values ​​between two adjacent electrodes among the three electrodes, and the first electrode 11 has two air holes 1. There is one lead-out hole for the second electrode 12 , and one blind hole for the third electrode 13 .

[0050] Using a carbon nanotube sensor with a fixed pole spacing, the single-value humidity characteristics in nitrogen were experimentally obtained ( Image 6 Shown), the humidity measurement model established by fusion of the ion current input data output by the sensor, and the humidity measurement value in nitrogen with an accuracy of less than 1% are obtained.

[0051] Image 6 In the embodiment shown in which the online gas detection device detects the humidity of the nitrogen environment, the experimental environment conditions are a temperature of 20.8-21.8°C and an ...

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Abstract

The invention discloses an online gas detection device based on a carbon-nano-tube membrane micron-nano electrode, which comprises a carbon-nano-tube membrane micron-electrode sensor array, a detector based on a microcontroller and connected with the output ends of all sensors in the carbon-nano-tube membrane micron-electrode sensor array through shielded cables, and a computer connected with thedetector, wherein the detector comprises a sensor voltage source used for supplying power for the sensor array. The carbon-nano-tube membrane micron-electrode sensor array detects concentration, temperature and humidity of the detected gas online in real time, the data is processed by the detector and then transmitted to the computer, the computer combines the data, outputs the detected values ofconcentration, temperature and humidity of the detected gas, and prints and outputs the detected values. The online gas detection device can accurately detect concentration, temperature and humidity of single has or mixed gas on line without separating the mixed gas. The online gas detection device has simple detection process, can detect multiple types of gases, has wide concentration range, causes less error of detection, and is applicable to detection of various gases.

Description

technical field [0001] The invention relates to the field of gas detection, in particular a micro-nano electrode based on carbon nanotube film, which is sensitive to any gas, has single-value gas-sensing characteristics, and can eliminate the influence of temperature and humidity interference, without separating mixed gases, can directly Gas online detection device for measuring the concentration of each component. Background technique [0002] Since the discovery of carbon nanotubes in 1991, they have shown attractive application prospects in the field of gas detection. The carbon nanotube film two-electrode ionization sensor in the carbon nanotube sensor, based on the principle of gas discharge, overcomes the shortcomings of other types of carbon nanotube gas sensors that are saturated and poisoned in the measured gas. With the advantages of wide range and fast response, it has become a research hotspot in the field of gas detection. [0003] However, the current gas mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64G01K7/40
Inventor 张勇王进王影花宋晓慧张晶园姜为华方静肖丹张建业牛国平王晓冰李昕唐建文刘君华
Owner XI AN JIAOTONG UNIV
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