Indium oxide-polyacid composite gas sensing material and preparation method thereof
A technology for sensing materials and composite gases, applied in chemical instruments and methods, tungsten compounds, electrochemical variables of materials, etc., can solve problems such as poor performance, affecting electron transmission, weakening of gas sensing detection signals, etc., and achieve gas sensing performance Improved, milder working conditions
Pending Publication Date: 2021-03-30
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology
[0003] 1. In the indium oxide 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 sensor detection signal
[0004] 2. The current commercial indium oxide 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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specific Embodiment
[0032] Put the interdigitated electrode with the composite film into a 1000 ml airtight glass 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 certain voltage is applied between the two electrodes, and a stable current value is obtained at room temperature. When 5ppm, 10ppm, 20ppm, 50ppm and 100ppm formaldehyde gas were injected into the glass bottle, the current between the two electrodes increased significantly.
[0033] (see attached Figure 5 )
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The invention provides an indium oxide-polyacid composite gas sensing material and a preparation method thereof. The prepared polyacid modified indium oxide nanofiber new material can be used for a semiconductor type gas sensor. The material is an indium oxide-polyacid nano composite material formed by taking indium oxide (In2O3) nano fibers as a main body and modifying with Keggin type phosphotungstic acid. In a room temperature environment, the sensor has obvious sensing detection performance on toxic formaldehyde gas. The indium oxide-polyacid composite material provided by the invention issimple in preparation method and very low in cost, can effectively detect low-concentration formaldehyde gas in air at room temperature, and is suitable for 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 an indium oxide-polyacid 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. Indium oxide is a typical metal oxide semiconductor gas-sensing material, which can detect CO, NO 2 、H 2 S and other toxic gases and organic solvents such as ethanol, acetone, triethylamine, DMF, etc. However, indium oxide, as a semiconductor gas-sensing material, still has the following problems: ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01N27/30C01G15/00C01G41/00D01D5/00
CPCG01N27/30C01G15/00C01G41/00D01D5/0015C01P2004/80C01P2004/10C01P2004/61C01P2004/62
Inventor 王天奇姜彬陈旭田进梅李丹杨颖董相廷于文生于辉王婷婷
Owner CHANGCHUN UNIV OF SCI & TECH
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