Tin oxide-based hydrogen sensing material based on rare earth element doping and precious metal modification as well as preparation method and application of tin oxide-based hydrogen sensing material

A rare earth element, sensing material technology, applied in tin oxide, material resistance, analytical materials, etc., can solve the problems of long response time and recovery time, poor hydrogen selectivity, complex preparation process, etc., to promote electron transfer and low detection. Limit, improve the effect of sensing performance

Active Publication Date: 2022-06-10
LANZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing traditional hydrogen sensors have poor stability, complex preparation process, high cost, long re

Method used

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  • Tin oxide-based hydrogen sensing material based on rare earth element doping and precious metal modification as well as preparation method and application of tin oxide-based hydrogen sensing material
  • Tin oxide-based hydrogen sensing material based on rare earth element doping and precious metal modification as well as preparation method and application of tin oxide-based hydrogen sensing material
  • Tin oxide-based hydrogen sensing material based on rare earth element doping and precious metal modification as well as preparation method and application of tin oxide-based hydrogen sensing material

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Embodiment 1

[0033] Comparative example 2: The only difference between this comparative example and Example 2 is that excess sodium hydroxide is added. The add-on of sodium hydroxide is 5g. Due to the excessive addition of sodium hydroxide, the pH value of the solution is too high, resulting in the smaller size of the prepared tin oxide microspheres, with a diameter of 50nm; the hydrogen sensor device obtained in this comparative example, at a working temperature of 200 ° C, the detection range is 125ppb-5ppm, the response time is 30s, the recovery time is 48s, and the response value to the hydrogen concentration of 5ppm is 9. Significant difference with the effect in Example 2.

[0034] Comparative example 3: The only difference between this comparative example and Example 3 is that no chloroauric acid solution is added. The hydrogen sensor device obtained in this comparative example has a detection range of 125ppb-5ppm at a working temperature of 250°C, a response time of 29s, a recove...

Embodiment 2

Embodiment 3

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Abstract

The invention discloses a tin oxide-based hydrogen sensing material based on rare earth element doping and precious metal modification and a preparation method and application thereof.The preparation method comprises the steps that tin salt and sodium hydroxide are dissolved in a mixed solution of deionized water and absolute ethyl alcohol, a PVP template agent is added, the mixture is stirred at the room temperature and then subjected to a hydrothermal reaction, and tin oxide microspheres are obtained; the preparation method comprises the following steps: adding tin oxide microspheres, scandium salt and urea into deionized water, stirring at room temperature, adding a noble metal compound solution, carrying out hydrothermal reaction, drying, annealing at 300-800 DEG C for 1-5 hours, and cooling along with a furnace to obtain the tin oxide-based hydrogen sensing material based on metal modification. The material provided by the invention has good crystallinity, and the morphology is a spherical particle with the diameter of 1-2 [mu] m. The preparation method disclosed by the invention is simple, low in cost, easy for batch production, energy-saving and environment-friendly. The tin oxide-based hydrogen sensing device prepared from the prepared material has the advantages of high sensitivity, good selectivity, short response recovery time and low detection lower limit when being used for detecting hydrogen.

Description

technical field [0001] The invention belongs to the technical field of metal oxide semiconductor gas sensor materials, and in particular relates to a tin oxide-based hydrogen sensor material based on rare earth element doping and noble metal modification and its preparation method and application. Background technique [0002] With the pursuit of diversification of energy structure in modern society and the limitation of traditional fossil fuels and the greenhouse effect and environmental protection problems brought by them, clean new energy has become a research hotspot. Hydrogen, as a form of energy with abundant reserves, renewable and pollution-free, is currently the most promising secondary energy source. However, hydrogen, as a gas with high diffusion rate, low ignition energy, wide explosion limit, colorless and odorless, will have serious consequences once it leaks and explodes. Therefore, developing a hydrogen sensor with high sensitivity and fast response time is ...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G19/02
CPCG01N27/125C01G19/02C01P2002/72C01P2004/03
Inventor 王妍蓉吴正昆谢二庆冒立海高文政
Owner LANZHOU UNIVERSITY
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