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Gas detection method and special sensor array thereof

A gas sensor and sensor array technology, applied in the field of spectral analysis, can solve the problems of unavoidable thermal background, interference, weak catalytic luminescence response, etc.

Active Publication Date: 2015-05-20
河北百强医用设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the catalytic temperature of this type of sensor array is relatively high (even if the noble metal catalyst with better performance is used, the temperature must be greater than 150 ° C), which cannot avoid the interference of the thermal background, and is not conducive to the development of instrument miniaturization.
For some substances with low catalytic oxidation activity, the catalytic luminescence response is weak, especially for the hydrocarbon compounds in the breath of cancer patients; in addition, due to the low content of some hydrocarbons in the breath, the The detection sensitivity also needs to be further improved

Method used

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  • Gas detection method and special sensor array thereof
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  • Gas detection method and special sensor array thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Embodiment 1, the comparative test with or without low-temperature plasma assistance

[0077] In order to determine the auxiliary performance of low-temperature plasma, the metal Mn-loaded SiO 2 Taking nanomaterials as an example, in response to CO, compare the chemiluminescence signals generated with and without plasma assistance. In the experiment, 1 mL of CO gas was injected, the air carrier gas flow rate was 100 mL / min, and the experimental temperature was 25 °C (catalytic temperature). In the experiment, nanomaterials with different metal doping ratios were selected as the response of the sensing unit, respectively 0.5% Mn / SiO 2 , 3%Mn / SiO 2 , 6%Mn / SiO 2 , 10% Mn / SiO 2 , the result is as figure 2 .

[0078] Depend on figure 2 It can be seen that when there is no plasma assistance, the four materials do not get obvious response signals, but when the high-voltage alternating current of the plasma is turned on, a high response signal is obtained in response t...

Embodiment 2

[0079] Embodiment 2, the impact of carrier gas and carrier gas velocity

[0080] In the experiment, 1mL CO gas was injected, the air carrier gas flow rate was 100mL / min, the experimental temperature was 25°C (catalytic temperature), and the sensing element material was 3% Mn / SiO 2 .

[0081] Since air, nitrogen, helium, etc. can all be used as the generation gas of the low-temperature plasma. like image 3 , this embodiment compares the signal intensity of the response signal of CO obtained when helium, nitrogen, and air are respectively used as the generating gas of the low-temperature plasma. It can be seen that when air is used as the generating gas of the low-temperature plasma, a stronger Respond to the signal. Through the response signal repeated three times, it can be explained that the detection system using air as the carrier gas can obtain a response signal with good signal and good repeatability for the gas sample. and from attached image 3 It can be seen that...

Embodiment 3

[0082] Embodiment 3, the influence of nano catalytic material

[0083] In the experiment, 1mL of sample gas was injected, the air carrier gas flow rate was 100mL / min, and the experimental temperature was 25°C (catalytic temperature).

[0084] In this embodiment, 16 different nano catalytic materials are selected as sensing units to construct a sensor array to respond to different gaseous alkane samples. As shown in Table 1, the nano-catalytic materials of No. 0-15 are MgO, ZnO, TiO 2 , 10% Fe / ZnO, 10% Fe / SiO 2 , 10%Ag / ZnO, 10%Mn / ZnO, 5%Ag / TiO 2 , 10%Co / TiO 2 , 3.18%Ag / MgO, 10%Co / ZnO, 5%Fe / TiO 2 , 10% Au / TiO 2 , 10% Au / ZnO, 10% Ag / TiO 2and 5%Pt / TiO 2 ,As shown in Table 1. The selected gaseous hydrocarbon sample gases include CO, C 2 h 2 、C 3 h 8 、CH 4 and C 2 h 4 , the experimental results are as Figure 4 The comparison chart shown.

[0085] Table 1, No. 0-15 nano catalytic materials

[0086]

[0087] Depend on Figure 4 It can be seen that the response s...

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Abstract

The invention discloses a gas detection method and a special sensor array thereof. The gas sensor array comprises a plasma generator and a sensor array chip, wherein one end of the plasma generator is connected with a three-way pipe; the other two ways of the three-way pipe are used as a sample gas inlet and a carrier gas inlet respectively; the other end of the plasma generator is used for introducing gas to the surface of the sensor array chip through a gas pipeline; the sensor array chip is composed of a temperature controllable inert chip, and an array composed of a plurality of sensing units and arranged on the surface of the inert chip; and different nano catalytic materials are loaded on each sensing unit. The gas sensor array combines high-activation performances of low-temperature plasmas, and the reaction activities of the catalytic materials and reactants are improved; the device is simple, the catalytic temperature is low, the energy consumption is low and the heat background is low; and the gas sensor array can be used for detecting environmental gas-state pollutants and respiratory air leaving away from a human body, and a simple and rapid novel method is provided for rapid diagnosis and early detection of diseases including cancers and the like.

Description

technical field [0001] The invention relates to a gas detection method and a special sensor array thereof, belonging to the field of spectrum analysis. Background technique [0002] Cancer detection has always been an important topic in bioclinical testing. There are many detection methods at present, but they have certain limitations. For example, B-ultrasound is economical and safe, but its scope of application is small; although CT and MRI can clearly find the lesion site, the inspection costs are expensive and there will be varying degrees of damage. Tissue radiation damage. In addition, biopsy is also a commonly used detection method. Excision biopsy or needle biopsy is performed with the help of CT or B-ultrasound results. After sampling, the sample is pretreated, then electrophoresis separation, chromatography-mass spectrometry detection, and finally the results are obtained by comparison. . The accuracy of this type of method is still affected by sampling, sample ...

Claims

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Application Information

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IPC IPC(8): G01N21/76
Inventor 那娜欧阳津
Owner 河北百强医用设备制造有限公司
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