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Method for preparing bismuth vanadate-polyacid gas sensing composite nano-material

A nanocomposite material and gas sensing technology, which is applied in the field of preparation of bismuth vanadate-polyacid gas sensing nanocomposite materials, can solve problems such as poor performance, affecting electron transmission, weakening of gas sensing detection signals, etc. The effect of maintaining sensitivity

Inactive Publication Date: 2017-08-18
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

[0004] 1. In the bismuth vanadate material, after the electrons transition to the conduction band, the electrons and holes are easy to recombine, which affects the transmission of electrons and leads to the weakening of the gas sensing detection signal
[0005] 2. The bismuth vanadate gas sensors that have been published so far often have gas-sensing performance only 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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specific Embodiment 1

[0030] Put the interdigitated electrode with the composite film into the sealed quartz reaction container 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 The electrodes are connected. A voltage of 0.1V was applied between the two electrodes, and a stable photocurrent value was obtained under the irradiation of a xenon lamp. When injecting 5ppm, 10ppm, 20ppm, 30ppm and 50ppm nitrogen dioxide gas into the quartz reaction vessel, the current between the two electrodes increases obviously. (see attached Figure 6 ).

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Abstract

The invention provides a method for preparing a bismuth vanadate-polyacid gas sensing composite nano-material. A prepared polyacid modified bismuth vanadate nano-rod composite gas sensitive material can be used in a photoelectric gas sensor. The gas sensitive material is a bismuth vanadate-polyacid composite nano-material which is formed by using a bismuth vanadate nano-rod as a main body and modifying with Keggin-type phosphotungstic acid. In a room temperature environment, under irradiation of a xenon lamp, the sensor has a remarkable sensing detection function for toxic nitrogen dioxide gas. The method for preparing the bismuth vanadate-polyacid gas sensing composite nano-material is simple, has low cost, can be used for effectively detecting low-concentration nitrogen dioxide gas in the air at room temperature, and is applicable to development and production of a novel high-performance gas sensor.

Description

[0001] Inventor: Xu Lin Zhang Qian technical field [0002] The invention belongs to the technical field of gas sensors, and relates to a preparation method of a bismuth vanadate-polyacid gas sensing nanocomposite material. Background technique [0003] 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. Bismuth vanadate is a new type of high-efficiency semiconductor photoelectric functional material. Because of its visible light absorption capacity, stable chemical properties, low price, and environmental protection, it is important in solar cells and photocatalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30C01G31/00C01G41/00B82Y30/00B82Y15/00
CPCB82Y15/00B82Y30/00C01G31/00C01G41/00C01P2002/72C01P2002/82C01P2004/03C01P2004/12C01P2004/52C01P2004/61C01P2004/80G01N27/305
Inventor 许林张倩
Owner NORTHEAST NORMAL UNIVERSITY
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