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Zinc oxide gas sensitive sensor for formaldehyde gas detection

A gas sensor and formaldehyde gas technology, applied in the field of gas sensors, can solve the problems of sensitivity and selectivity to be improved, easy to be affected by the environment, etc., to achieve accurate sensing of the existence of gas, increase the surface area, and improve the responsivity Effect

Pending Publication Date: 2020-05-12
GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the shortcomings in the prior art, such as: the existing semiconductor metal oxide gas sensor is easily affected by the environment, its sensitivity and selectivity need to be improved, and a formaldehyde gas detection proposed zinc oxide gas sensor

Method used

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  • Zinc oxide gas sensitive sensor for formaldehyde gas detection
  • Zinc oxide gas sensitive sensor for formaldehyde gas detection
  • Zinc oxide gas sensitive sensor for formaldehyde gas detection

Examples

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Effect test

Embodiment 1

[0028] refer to Figure 1-3 , this embodiment provides a zinc oxide gas sensor for formaldehyde gas detection, comprising a housing 1 and a gas sensor assembly 4, the gas sensor assembly 4 is arranged in the housing 1, the upper end of the housing 1 is provided with an opening 2, and the housing The inner wall of the body 1 is fixedly connected with a net cover 3, the net cover 3 is in contact with the opening 2, the bottom of the housing 1 is provided with a bottom plate 6, and the bottom plate 6 is fixedly connected with a snap ring 5, and the snap ring 5 is connected with the inner wall of the housing 1. Clamping, the gas sensor assembly 4 is fixedly installed on the film 6, the bottom of the gas sensor assembly 4 is fixedly connected with a plurality of lead wires 7, and the plurality of lead wires 7 pass through the film 6, the gas sensor assembly 4 includes an element base 12, and the element base Four Pt electrodes 8 and two heating poles 10 are fixedly installed on the...

Embodiment 2

[0037] This embodiment provides another zinc oxide gas sensor for formaldehyde gas detection. On the basis of the above embodiment, the gas sensor assembly 4 includes an interdigital base 16, and a plurality of conductive substrates are arrayed on the interdigital base 16. 18. An interdigital electrode 17 is arranged symmetrically above the interdigital base 16. Two interdigital electrodes 17 are intersected. The interdigital electrode 17 is connected to the conductive substrate 18. The width of the interdigital electrode 17 is 100-200 μm. 17 is obtained by evaporation on ZnO nanowires using a specific mask plate using a ZHD-400 high-vacuum evaporation coating machine, and the electrode material is gold.

[0038] Compared with ordinary electrodes, the interdigital electrodes 17 not only greatly reduce the electrode spacing, but also greatly increase the electrode area. The optimized interdigital electrodes 17 can greatly increase the current intensity. The sensor can be realize...

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Abstract

The invention discloses a zinc oxide gas sensitive sensor for formaldehyde gas detection. The sensor comprises a housing and a gas sensitive assembly. The gas sensitive assembly is arranged in the housing; an opening is formed in the upper end of the housing; and a mesh enclosure is fixedly connected to the inner wall of the housing. The mesh enclosure is in contact with the opening; a bottom sheet is arranged at the bottom of the housing; the bottom sheet is fixedly connected with a clamping ring; the clamping ring is connected with the inner wall of the housing in a clamping manner; the gas-sensitive assembly is fixedly arranged on the bottom sheet, the bottom of the gas-sensitive assembly is fixedly connected with a plurality of leads, and the plurality of leads passes through the bottom sheet. The gas-sensitive assembly comprises an element base, four Pt electrodes and two heating electrodes are fixedly arranged on the element base, and gas-sensitive elements are arranged among thefour Pt electrodes. The current and voltage curves of the ZnO nanoparticles prepared by a sol-gel method are in a linear relationship in dark and illumination states, and the ZnO nanoparticles are ingood ohmic contact with an Au electrode.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a zinc oxide gas sensor for formaldehyde gas detection. Background technique [0002] Gas sensor is a sensor used to detect gas concentration and composition. It plays an extremely important role in environmental protection and safety supervision. Semiconductor metal oxide sensors are often used because of their small size, low cost, simple structure, and simple preparation. Widely used due to their long lifespan, intense research efforts are underway worldwide to synthesize nanomaterials and fabricate highly efficient miniaturized devices in order to use this material in various nanoelectronics and nanosensors. [0003] Because it is exposed to various components of gas, the temperature and humidity of the detection site vary greatly, and the working environment is relatively harsh. The existing semiconductor metal oxide gas sensors are easily affected by the environment. Th...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 黄国家李悦李茂东李仕平王恋杨波王志刚李露水
Owner GUANGZHOU SPECIAL PRESSURE EQUIP INSPECTION & RES INST
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