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Gas Sensing Components, Gas Sensing Devices and Systems

A gas sensor and gas sensor technology, applied in the field of gas sensor, can solve the problem of low yield rate and achieve excellent anti-deactivation effect

Inactive Publication Date: 2021-08-24
武汉市义光亿科贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, various existing electronic devices also have the problem of low yield rate as the process size gradually becomes smaller.

Method used

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  • Gas Sensing Components, Gas Sensing Devices and Systems
  • Gas Sensing Components, Gas Sensing Devices and Systems
  • Gas Sensing Components, Gas Sensing Devices and Systems

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] The preparation method of the gas-sensitive material according to some embodiments of the present invention includes: mixing one or more oxide nanopowders with an optional catalyst; making the mixture granulated and then compression-molded, and the molding pressure can be, for example, 1-20MPa , especially 5-15MPa, to obtain a green body; sintering the green body to obtain a sintered body, the temperature, time and atmosphere of the sintering process are selected so that the sintered body meets the requirements of the gas-sensitive material of the aforementioned scheme. In some embodiments, a gas sensor or a gas-sensitive electronic device can be manufactured using the sintered body, especially including forming electrodes on the sintered body, and the electrodes can be formed by conventional electrode materials such as platinum, gold or silver through conventional processes.

[0059] While not wishing to be bound by any theory, the oxide structures and associated fabric...

Embodiment 1

[0063] Example 1: SnO with a (average) particle size of 70 nm with unimodal distribution characteristics 2 Powder and Pt powder with a particle size of about 850 nanometers were mixed at a mass ratio of 95:5, deionized water was added to make a suspension, and magnetic stirring was performed for 4 hours. Dried after centrifugation, pressed under 10MPa pressure, 12mm in diameter, 2mm in thickness, and sintered in air at 900°C for 2 hours. A pair of gold electrodes were formed on the surface of the sample by magnetron sputtering with a distance of 3 mm between the electrodes. In this way, a hydrogen sensor capable of hydrogen gas sensing test is obtained.

[0064] The hydrogen gas sensitivity test includes placing the sample in a closed chamber (approximately 350 milliliters volume) with an inlet and an outlet. At the detection temperature, after passing a detection gas containing hydrogen, apply A certain voltage, start to measure the current at each moment in the circuit, so...

Embodiment 2

[0068] Embodiment 2: In addition to using SnO with a particle size of 70 nanometers 2 powder, 50nm Al 2 o 3 Powder and Pt powder were mixed at a mass ratio of 92:3:5, and a hydrogen sensor was prepared in the same manner as in Example 1 for testing. The test result shows that it possesses similar hydrogen sensitivity properties as that of Example 1.

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Abstract

The present invention relates to a gas sensitive element, a gas sensitive device and a system, in particular to a gas sensitive element, including a gas sensitive material, especially an oxide-based gas sensitive material, the gas sensitive material can stably realize one or more of the following A number of detection indicators: detection sensitivity, response time, selectivity and / or detection limit at a specific working temperature. 1) the detection indexes measured by the gas sensor and / or device all fall within ±50% of the average value, especially ±30%, more especially ±20%, even within ±10%; and / or 2) After at least 10 detection cycles, or at least 20, at least 30, at least 50, or even at least 100 detection cycles of gas sensor elements and / or devices made of gas-sensitive materials, the detection sensitivity compared to the first cycle The ratio of the final sensitivity is greater than 80%, even greater than 98%.

Description

technical field [0001] The invention relates to a gas sensor, a gas sensor and a detection system suitable for detecting a specific gas. Background technique [0002] Gas sensors are widely used in industry and daily life. Especially in fields such as mining, chemical industry, and energy production, real-time monitoring of hydrogen concentration is required. In recent years, the application of hydrogen in the field of new energy has attracted great attention. Especially for fuel cells and hydrogen-powered vehicles, it is particularly critical to detect the concentration of hydrogen accurately and quickly. Therefore, sensors that can accurately detect hydrogen are very much needed at present. However, the traditional hydrogen sensor has disadvantages such as low sensitivity and high working temperature, which cannot meet the needs of practical use well. In order to improve the performance of gas sensing devices, many efforts have been carried out in the prior art. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04
CPCG01N27/04G01N27/407
Inventor 江滢余龙文蒋正勇
Owner 武汉市义光亿科贸有限公司
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