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Color and conductivity dual-mode gas sensing device and preparation and use methods thereof

A technology of gas sensing and sensing devices, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through electromagnetic means, etc., can solve the problems of low accuracy and reliability of sensing methods, and improve the system Stability, improve reliability, reduce the effect of false alarm rate

Pending Publication Date: 2021-11-19
山东智微检测科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the accuracy of the single sensing method is low, and the reliability still needs to be improved

Method used

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  • Color and conductivity dual-mode gas sensing device and preparation and use methods thereof
  • Color and conductivity dual-mode gas sensing device and preparation and use methods thereof
  • Color and conductivity dual-mode gas sensing device and preparation and use methods thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like figure 1 As shown, a dual-mode gas sensing device of color and conductance, the sensing device includes a ceramic heating chip 10 and a metal oxide thin film 11 attached to the ceramic heating chip 10 . The metal oxide film 11 is a titanium dioxide film, and both ends of the ceramic heating chip 10 are provided with electrodes 20 and wires 21 . The wire 21 is connected to a gas sensitive detector, and a color detector 30 connected to a spectrometer is also arranged on the titanium dioxide film.

[0040] In this embodiment, the thickness of the titanium dioxide film is 1 μm, the ceramic heating plate 10 is a commercial ceramic heating plate 10 with a size of 30 mm×30 mm×3 mm, and the electrode 20 is a gold electrode.

[0041] The gas sensitive detector uses a commercial sensitive instrument such as the portable single-channel gas sensitive tester (model ZWX-P1) of Nanjing Zhiweixin formula, which is used to collect the conductance change of the titanium dioxide fil...

Embodiment 2

[0043] The method for preparing the sensing device in Example 1, the steps are as follows:

[0044] S1. Mix 0.1g of anatase titanium dioxide nanoparticles (p25) powder with 5 mL of deionized water, and fully sonicate in the ultrasonic pool until a uniform colloidal solution is formed;

[0045] S2. Take 0.1mL colloidal solution and drop it on the clean alumina ceramic heating plate 10, and spin-coat it at a working speed of 10-200r / min in a spin coater;

[0046] S3. After the colloidal solution to be spin-coated is dried, repeat the above S2 a total of 5 times, namely to make a ceramic heating plate 10 with a titanium dioxide film, and the thickness of the titanium dioxide film is 1 μm;

[0047] S4. Physically sputter-deposit gold electrodes at both ends of the ceramic heating chip 10 prepared in S3 by covering, and connect wires 21 to the gold electrodes, and set a color detector 30 on the titanium dioxide film;

[0048] S5. Connect the lead wires 21 at both ends of the ceram...

Embodiment 3

[0050] Utilize sensor in embodiment 1 to measure target gas, gas is concentration 100ppm ethanol vapor, method is as follows:

[0051] S1. Place the alumina ceramic heater 10 attached with a titanium dioxide film in the target gas environment to be measured, set the temperature of the ceramic heater 10 to 200°C through the heating function of the ceramic heater 10, and then the working temperature of the sensing device is 200°C ;

[0052] S2. Turn on the gas sensitivity tester, the color detector 30 and the UV-vis spectrometer, and record the optical absorption spectrum and conductivity change of the titanium dioxide film.

[0053] When the target gas appears in the environment, it can be observed that the color of the titanium dioxide film changes and gradually turns yellow.

[0054] In this embodiment, the change of titanium dioxide film resistance in the monitoring process is as follows: figure 2As shown, it can be seen that the resistance of the titanium dioxide film dr...

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Abstract

The invention belongs to the field of gas detection, and particularly relates to a color and conductivity dual-mode gas sensing device and preparation and use methods thereof. The sensing device is composed of a ceramic heating sheet and a metal oxide thin film attached to the ceramic heating sheet, gold electrodes and wires are arranged at the two ends of the ceramic heating sheet, and a conductivity detection device is connected with the wires and used for collecting the conductivity change of the metal oxide thin film; and the metal oxide thin film is further provided with a color detector, and a spectrum detection device is connected with the color detector and used for analyzing and collecting the optical absorption spectrum of the metal oxide thin film. According to the sensing device and the detection method provided by the invention, the conductivity detection result is combined with the detection judgment of color change, so that the sensing device and the detection method provided by the invention not only have higher detection capability, but also have a visual monitoring effect, and can be widely applied to the detection of different gas environments.

Description

technical field [0001] The invention belongs to the field of gas detection, and in particular relates to a dual-mode gas sensing device of color and conductance and a preparation and use method thereof. Background technique [0002] Efficient gas monitoring is of great significance to public safety and social production. An efficient gas sensor should have fast response, high sensitivity and high accuracy. However, the current main technologies are difficult to meet these requirements simultaneously. [0003] For example, the representative conductivity-type gas sensing technology can achieve high sensitivity and fast response, etc., but this conductivity-type sensing method relies on electrical measurement, and once the circuit fails, it will not work. For monitoring and early warning systems, Security cannot be guaranteed. In addition, there are some sensing methods that use color changes, such as aerochromic technology, although it does not rely on electrical measureme...

Claims

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Application Information

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IPC IPC(8): G01N27/12G01N21/78G01N21/31
CPCG01N27/127G01N21/783G01N21/31G01N2021/775
Inventor 鲍皓明张洪文崔锡荣蔡伟平
Owner 山东智微检测科技有限公司