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Carbon nano tube film three-electrode ethylene sensor and concentration measuring method using same

A carbon nanotube film and three-electrode technology, which is applied in the field of gas sensing, can solve the problems of low sensitivity, large discharge voltage and discharge current, and the inability to realize carbon nanotube film anode measurement, etc., and achieve the effect of accurate measurement

Inactive Publication Date: 2011-06-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sensor has a nonlinear relationship between the breakdown voltage and the gas concentration, and the linear error between the breakdown discharge current and the gas concentration is large; the discharge voltage and discharge current are large; the carbon nanotube film anode cannot measure a single gas
Professor Hui Guohua and Professor Chen Yuquan from the School of Biomedical Engineering and Instrument Science of Zhejiang University developed a carbon nanotube film cathode two-electrode gas sensor under the condition of 120 micron electrode spacing, and studied the discharge characteristics of the sensor in three single gases , due to low sensitivity, does not constitute a gas sensor for measuring concentration

Method used

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  • Carbon nano tube film three-electrode ethylene sensor and concentration measuring method using same
  • Carbon nano tube film three-electrode ethylene sensor and concentration measuring method using same
  • Carbon nano tube film three-electrode ethylene sensor and concentration measuring method using same

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Effect test

Embodiment 1

[0037] Such as Figure 4 , Figure 5 As shown, the carbon nanotube thin film three-electrode ethylene sensor consists of three electrodes stacked one after another from top to bottom, and the three stacked electrodes are respectively provided with a first electrode 1, a second electrode 2 and a third electrode 3. The first electrode 1 is composed of a substrate 5 with a carbon nanotube film distributed on the inner surface and an electrode 4 with air holes; the second electrode 2 is composed of a lead-out plate with a lead-out hole in the center; The third electrode 3 is composed of a collector with a blind hole on the electrode plate surface; the three electrodes are separated from each other by insulating pillars 7 .

[0038] Figure 4 In the shown embodiment of the carbon nanotube film three-electrode ethylene sensor, there are two vent holes on the electrode surface of the first electrode 1, and the vent holes are circular; a carbon nanotube film is bonded to the surface...

Embodiment 2

[0046] The basic structure of this embodiment is the same as that of Embodiment 1, the difference is that the electrode spacing between two adjacent electrodes in the three electrodes of the carbon nanotube film three-electrode ethylene sensor is 250 μm and 30 μm respectively, and the first electrode 1 and the second electrode 2 polar plates facing area is 0.01mm 2 , the area of ​​the plate facing the second electrode 2 and the third electrode 3 is 0.01mm 2 .

[0047] There is one vent hole on the electrode surface of the first electrode 1, and the vent hole is quadrilateral, pentagonal or hexagonal; the second electrode 2 has 4 center lead-out holes, and the lead-out holes are quadrilateral, pentagonal or hexagonal ; The number of blind holes in the third electrode 3 is 4, and the blind holes are 3-6 prisms or pyramids.

[0048] The measurement method of the present embodiment is basically the same as embodiment 1, the difference is:

[0049] The cathode voltage of the fir...

Embodiment 3

[0051] The basic structure of this embodiment is the same as that of Embodiment 1, the difference is that the electrode spacing between two adjacent electrodes in the three electrodes of the carbon nanotube film three-electrode ethylene sensor is 250 μm and 30 μm respectively, and the first electrode 1 and the second electrode 2 polar plates facing area is 10mm 2 , the area of ​​the plates facing the second electrode 2 and the third electrode 3 is 100mm 2 .

[0052] There are 4 vent holes on the electrode surface of the first electrode 1, and the vent holes are quadrilateral, pentagonal or hexagonal; the second electrode 2 has 2 central lead-out holes, and the lead-out holes are quadrilateral, pentagonal or hexagonal ; The number of blind holes in the third electrode 3 is 2, and the blind holes are 3-6 prisms or pyramids.

[0053] The measurement method of the present embodiment is basically the same as embodiment 1, the difference is:

[0054] The cathode voltage of the fi...

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Abstract

The invention discloses a carbon nano tube film three-electrode ethylene sensor and a concentration measuring method using same; the sensor comprises a first, a second and a third electrodes distributed in sequence; the first electrode is provided with an air vent, and the inner surface of the air vent is bonded with a substrate provided with a carbon nano tube film; the center of the second electrode is provided with an exist aperture; the surface of the third electrode is provided with a blind hole; and the three electrodes are separated from each other. The method comprises the following steps of: 1) arranging the ethylene sensor, a temperature sensor and a humidity sensor with different electrode spacings in ethylene to be measured; 2) applying voltages on the electrodes; 3) measuringthe ion flow value of each sensor; 4) forming a sample by the measured value and ethylene concentration, temperature and humidity calibration value, and constructing an ethylene concentration measuring database with a interpolation sample; 5) constructing a data fusion instrument and building an ethylene concentration measuring model; 6) inputting the measured value of the sensor to the measuringmodel, and obtaining the accurate measuring value of ethylene concentration. The sensor has advanges of high in measurement of ethylene flexibility, good in linearity and high in precision.

Description

technical field [0001] The invention relates to the field of gas sensing, in particular to a three-electrode ethylene sensor based on carbon nanotube film and gas discharge principle and a method for measuring ethylene concentration. Background technique [0002] With the urgent need of gas detection in all walks of life and the development of nanotechnology, nanosensors have made great progress. Especially with the discovery of carbon nanotubes at the end of the 20th century, carbon nanotubes have shown attractive application prospects in the fields of gas, temperature and humidity detection. The carbon nanotube film two-electrode sensor among carbon nanotube gas, temperature and humidity sensors has become a research hotspot in the field of gas, temperature and humidity detection due to its advantages of high detection sensitivity, wide detection gas range and fast response. Carbon nanotube film two-electrode gas sensor is based on the principle of gas discharge, which ov...

Claims

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Application Information

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IPC IPC(8): G01N27/64G01K7/40
Inventor 张勇张晶园王进姜为华宋晓慧方静王影花张建业牛国平王晓冰李昕唐建文刘君华
Owner XI AN JIAOTONG UNIV