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Tin dioxide-multi-acid composite gas sensing material and preparation method thereof

A technology of tin dioxide and sensing materials, applied in chemical instruments and methods, tungsten compounds, analytical materials, etc., can solve problems such as affecting electron transmission, poor performance, and weakening of gas sensing detection signals

Inactive Publication Date: 2019-03-22
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 1. In tin dioxide materials, after the electrons transition to the conduction band, the electrons and holes are easy to recombine, which affects the transmission of electrons, resulting in the weakening of the gas sensor detection signal
[0004] 2. The current commercial tin dioxide gas sensors often have gas-sensing performance under high temperature conditions, but their performance is poor at room temperature, which is not conducive to real-time monitoring of the measured gas

Method used

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  • Tin dioxide-multi-acid composite gas sensing material and preparation method thereof
  • Tin dioxide-multi-acid composite gas sensing material and preparation method thereof
  • Tin dioxide-multi-acid composite gas sensing material and preparation method thereof

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Effect test

specific Embodiment 1

[0039] Put the interdigitated electrode with the composite film into a 500 ml airtight quartz bottle for testing, one of the gold electrodes of the interdigitated electrode is connected to the working electrode of the electrochemical workstation with a wire, the other gold electrode and the counter electrode and the reference connected to the electrodes. A voltage of 1V was applied between the two electrodes, and a stable photocurrent value was obtained under the irradiation of a xenon lamp. When 50ppm, 100ppm, 150ppm and 200ppm formaldehyde gas were injected into the quartz vial, the photocurrent between the two electrodes increased significantly. (see attached Figure 7 )

specific Embodiment 2

[0040] Put the interdigitated electrode with the composite film into a 500 ml airtight quartz bottle for testing, one of the gold electrodes of the interdigitated electrode is connected to the working electrode of the electrochemical workstation with a wire, the other gold electrode and the counter electrode and the reference connected to the electrodes. A voltage of 1V was applied between the two electrodes, and a stable photocurrent value was obtained under the irradiation of a xenon lamp. When 50ppm, 100ppm, 150ppm and 200ppm toluene gas were injected into the quartz vial, the photocurrent between the two electrodes increased significantly.

[0041] (see attached Figure 8 ).

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Abstract

The invention provides a stannic oxide-polyacid compound gas sensing material and a preparation method thereof. The prepared new polyacid-modified stannic oxide nano-rod material can be applied to a photoelectric gas sensor. The material is the stannic oxide-polyacid compound material which is formed by taking stannic oxide (SnO2) nano-rod as a main body and modifying with a cyanogen metal complex modified Dawson type phosphowolframate ((C4H10ON)23[HN(CH2CH2OH)3]10H2[FeIII(CN)6(alpha2-P2W17O61CoII)4].27H2O). Under room temperature environment and irradiation of a xenon lamp, the sensor has obvious sensing detecting property for toxic formaldehyde and methylbenzene gas. The preparation method for the stannic oxide-polyacid compound gas sensing material provided by the invention is simple and is fit for the development and production of a novel high-performance gas sensor.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and relates to a tin dioxide-multi-acid composite gas sensing material and a preparation method thereof. Background technique [0002] A gas sensor refers to a device or device that converts the measured gas concentration into an electrical output that has a certain relationship with it. It uses the physical and chemical properties of various gases to convert the changes of the monitored gases in the environment into easy-to-handle electrical signals, so that people can control and apply them correctly and effectively. It is the primary link to realize automatic detection and automatic control. Tin dioxide is a typical metal oxide semiconductor gas-sensing material, which can detect H 2 、CH 4 , propane, butane, natural gas and other flammable gases, CO, NH 3 、H 2 Toxic gases such as S, organic solvents such as acetic acid, toluene, xylene, gasoline, Freon, smog, freshness of fish and mea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/404C01G41/00
CPCC01G41/006C01P2002/72C01P2002/85C01P2004/03C01P2004/50C01P2004/82G01N27/4045
Inventor 王天奇许林
Owner NORTHEAST NORMAL UNIVERSITY