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Gas-sensitive material, preparation method and application of gas-sensitive material in gas-sensitive sensor

A gas-sensitive sensor and gas-sensitive material technology, applied in the direction of analyzing materials, material resistance, material analysis by electromagnetic means, etc., can solve the problems of device sensitivity, consistency, poor repeatability, unfavorable components and application circuit integration, etc. Achieve high sensitivity, short response and recovery time

Active Publication Date: 2019-07-23
米茄半导体(东莞)有限公司
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  • Application Information

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Problems solved by technology

The first application of ZnO gas-sensing materials is sintered body type and thick-film type, but the slight difference in the preparation process will have a severe impact on the gas-sensing characteristics, and the sensitivity, consistency, and repeatability of the device are poor, and it is not conducive to the realization of Integration of components and application circuits

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  • Gas-sensitive material, preparation method and application of gas-sensitive material in gas-sensitive sensor

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preparation example Construction

[0031] The present invention further provides the g-C 3 N 4 / ZnO gas-sensing material preparation method: first prepare graphite phase nitrogen carbide, then add zinc oxide precursor, prepare g-C by hydrothermal method 3 N 4 / ZnO, specifically including the following steps:

[0032] S1: Preparation of graphite-phase carbon nitride: Weigh 5g of melamine into a crucible, place it in a muffle furnace, heat it to 550-600°C at a heating rate of 5-8°C / min, and keep it warm for 5h. After cooling to room temperature, take it out Grind, dissolve in absolute ethanol for ultrasonic dispersion, then centrifuge, take out the supernatant to obtain a precipitate, repeat three times, and then put it in a 60°C drying oven to dry to obtain a yellow powder g-C 3 N 4 ;

[0033] S2: Preparation of g-C by hydrothermal method 3 N 4 / ZnO precursor dispersion:

[0034] a. Prepare g-C 3 N 4 Suspension: at room temperature, weigh 5.9mg g-C 3 N 4 Dissolve in 10 mL of deionized water and stir ...

Embodiment 1

[0039] Embodiment 1 prepares g-C 3 N 4 / ZnO gas sensitive material

[0040] S1: Preparation of graphite-phase carbon nitride: Weigh 5g of melamine into a crucible, place it in a muffle furnace, heat it to 550°C at a heating rate of 5°C / min, and keep it warm for 5h. After cooling to room temperature, take it out and grind it, dissolve it in Ultrasonic dispersion in absolute ethanol, then centrifugation, take out the supernatant to obtain the precipitate, repeat three times, and then put it in a 60°C drying oven to dry to obtain a yellow powder g-C 3 N 4 ;

[0041] S2: Preparation of g-C by hydrothermal method 3 N 4 / ZnO precursor dispersion:

[0042] a. Prepare g-C 3 N 4 Suspension: at room temperature, weigh 5.9mg g-C 3 N 4 Dissolve in 10 mL of deionized water and stir until fully dissolved to form g-C 3 N 4 suspension;

[0043] b. Preparation of zinc acetate solution: at room temperature, weigh 1.317g of zinc acetate in 20mL of deionized water, and stir until the...

Embodiment 2

[0046] Embodiment 2 prepares g-C 3 N 4 / ZnO gas sensor

[0047] Take g-C 3 N 4 / ZnO product powder was ground for 20min, then added deionized water and mixed until paste, g-C 3 N 4 The mass ratio of / ZnO to deionized water is 1:0.5, and the resulting paste is evenly spread on the gold electrode-coated Al 2 o 3 After the ceramic tube is surfaced, dry it in an oven at 80°C for 5 hours, then insert the nickel-chromium alloy wire into the composite gold electrode ceramic tube, and weld it on the hexagonal base, and age the welded components at 300°C for 3 days .

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Abstract

The invention provides a gas-sensitive material, a preparation method and an application of the gas-sensitive material in a gas-sensitive sensor. The g-C3N4 / ZnO gas-sensitive material is of a lamellarstacking structure, wherein the g-C3N4 accounts for 1% (in mass fraction) of the g-C3N4 / ZnO; and when the working temperature is 280 DEG C, the g-C3N4 / ZnO gas-sensitive material has the sensitivity of 84.1 for a 100ppm ethanol gas. The preparation method is as follows: firstly, preparing graphite phase carbon nitrogen, adding a zinc oxide precursor, and preparing the g-C3N4 / ZnO by a hydrothermalmethod; and applying the g-C3N4 / ZnO in the gas-sensitive sensor, and coating the g-C3N4 / ZnO gas-sensitive material on the surface of an Al2O3 ceramic tube coated with a gold electrode and preparing agas-sensitive sensing element. According to the preparation method of the invention, the g-C3N4 is coupled with nano ZnO by using the hydrothermal method, and a g-C3N4 / ZnO (1%g-C3N4) gas-sensitive material is prepared for the first time, so that the integration of the material and the function of a gas sensor is realized, the response and recovery time of reducing gases such as ethanol, methane, hydrogen sulfide and the like is short, and the sensitivity is high.

Description

technical field [0001] The invention relates to the technical field of preparation of functional nanometer materials, and also to the technical field of gas sensing and detection, in particular to a gas-sensitive material, a preparation method and its application in a gas-sensitive sensor. Background technique [0002] A gas sensor is an information device that converts parameters such as gas type and concentration into information that can be used by personnel, instruments, computers, etc. Detection methods can be divided into measuring changes in resistance, potential, current, heat, heat conduction, temperature, light absorption, and light refractive index. Gas sensors can quickly and accurately monitor various harmful, toxic, flammable and explosive gases in the environment, so they have important applications in disaster prevention, industrial production, environmental protection, automobile exhaust, national defense and other fields. Gas sensors can be roughly divided...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 张现峰吕长鹏王传虎杜文杰王威
Owner 米茄半导体(东莞)有限公司
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