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A kind of gas sensitive material, preparation method and its application in gas sensor

A gas-sensitive sensor and gas-sensitive material technology, applied in material resistance, material analysis, 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: 2021-11-23
米茄半导体(东莞)有限公司
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  • Abstract
  • Description
  • Claims
  • 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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  • A kind of gas sensitive material, preparation method and its application in gas sensor
  • A kind of gas sensitive material, preparation method and its application in gas sensor
  • A kind of gas sensitive material, preparation method and its application in gas 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 its application in a gas sensor, the g-C 3 N 4 / ZnO gas-sensing material is a lamellar stacked structure, where g‑C 3 N 4 account for g‑C 3 N 4 / ZnO mass fraction is 1%; when the working temperature is 280°C, its sensitivity to 100ppm ethanol gas reaches 84.1; the preparation method is as follows: first prepare graphite phase nitrogen carbide, then add zinc oxide precursor, and prepare by hydrothermal method g‑C 3 N 4 / ZnO; for its application in gas sensors, g‑C 3 N 4 / ZnO gas-sensing material coated on gold electrode coated Al 2 o 3 The surface of the ceramic tube is made into a gas sensitive sensor element. The present invention utilizes hydrothermal method to g-C 3 N 4 Coupled with nano-ZnO, g‑C was prepared for the first time 3 N 4 / ZnO(1%g‑C 3 N 4 ) gas-sensitive materials, realize the integration of gas sensor materials and functions, and have short response and recovery time and high sensitivity to reducing gases such as ethanol, methane, and hydrogen sulfide.

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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Patent Type & Authority Patents(China)
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