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High-response high-thermal-stability stannic oxide sensor and preparation method thereof

A high thermal stability, tin dioxide technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of sensitivity, low powder stability, mutation, etc.

Inactive Publication Date: 2021-07-30
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a high-response and high-thermal-stability tin dioxide sensor and its preparation method, which solves the problem of the SnO2 sensor obtained by the hydrothermal method. 2 The technical problems of low stability of powder in high temperature working environment and easy mutation of sensitivity

Method used

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  • High-response high-thermal-stability stannic oxide sensor and preparation method thereof
  • High-response high-thermal-stability stannic oxide sensor and preparation method thereof

Examples

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Embodiment 1

[0031] A high-response and high-thermal-stability tin dioxide sensor of the present invention comprises: a substrate, an interdigitated metal electrode layer, and a sensing conductor, the interdigitated metal electrode layer is located on the upper surface of the substrate, and the sensing conductor is located on the interdigitated The upper surface of the metal electrode layer, the sensing conductor is SnO 2 Thin film material, sensing conductor used to detect gas content in high temperature environment.

[0032] In this example, the preparation of SnO 2 The steps for thin film materials are as follows:

[0033] S1. Weigh 0.35g SnCl 4 ·5H 2 O dissolve it in solution A, solution A is prepared by 10ml deionized water and 10ml ethanol;

[0034] S2. Adjust the pH value of solution A by using NaOH solution with pH=13 until the pH of solution A=4 to obtain solution B;

[0035] S3. Pour the solution B into the reactor to carry out the hydrothermal reaction. The temperature of t...

Embodiment 2

[0043] The only difference from Example 1 is that the substrate is made of insulating material, and the interdigitated metal electrode layer is a platinum electrode made by microelectronics technology on the substrate, and the platinum electrode is interdigitated, which can improve the reliability of the production process. High repeatability, conducive to mass production. SnO 2 The thin film material consists of nanorods, SnO 2 Film surface with nodules, SnO 2 The thin film material is evenly located on the upper surface of the interdigitated metal electrode layer, which can improve the SnO 2 The surface ratio of the thin film material is beneficial to improve the sensitivity. In addition, it also includes a protective shell, which is provided with several holes for ventilation, and the base, the interdigitated metal electrode layer and the sensing conductor are all packaged inside the protective shell.

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Abstract

The invention relates to the technical field of preparation of sensitive materials of gas sensitive sensors and particularly relates to a high-response and high-thermal-stability stannic oxide sensor and a preparation method thereof. The method comprises steps that 0.35 g of SnCl4. 5H2O is weighed and dissolved in a solution A; the pH value of the solution A is adjusted to 4 by using a NaOH solution with the pH value of 13 to obtain a solution B; the solution B is poured into a reaction kettle for hydrothermal reaction to obtain a solution C; the solution C is washed to be neutral to obtain a solution D; the solution D is put into a centrifugal tube for centrifugal treatment, and after centrifugal treatment, the solution D is taken out and put into a drying box at the temperature of 80 DEG C for drying to obtain a white precipitate; the white precipitate is ground to obtain SnO2 powder; the obtained SnO2 powder is placed in a tubular furnace for heat treatment, the heat treatment temperature is 600 DEG C, the heat treatment time is 5 h, and the SnO2 thin film material is obtained. The method is advantaged in that technical problems that SnO2 powder obtained through a hydrothermal method is low in stability in a high-temperature working environment, and sensitivity mutation is prone to occurring are solved.

Description

technical field [0001] The invention relates to the technical field of preparation of sensitive materials for gas sensors, in particular to a tin dioxide sensor with high response and high thermal stability and a preparation method. Background technique [0002] For SnO 2 For the preparation of hydrothermal reaction, since the hydrothermal reaction is carried out at a relatively high temperature and pressure, it can realize the reaction that cannot be carried out under conventional conditions, and the reaction speed is fast. Changing the pH value of the hydrothermal reaction, the ratio of raw materials and other conditions will SnO with different morphologies and structures can be obtained 2 Powder. In addition, the hydrothermal method can directly obtain well-crystallized SnO 2 Powder, hydrothermally synthesized SnO 2 The purity is high and the grain development is good. Therefore, SnO was prepared by hydrothermal method 2 The material has received a lot of attention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 程正富夏继宏张晓宇杨文耀伏春平朱洪吉
Owner CHONGQING UNIV OF ARTS & SCI