Method for detecting ethanol by indium oxide-based folded microspheres and application of indium oxide-based folded microspheres

Abstract

The invention belongs to the technical field of semiconductor oxide gas sensors, and discloses a method and application for detecting ethanol by indium oxide-based folded microspheres. The method comprises the following steps: weighing In(NO3)3, dispersing the In(NO3)3 in deionized water, and stirring until the solution is transparent; adding the solution into an atomization device in spray pyrolysis, and setting N2 as carrier gas; after the solution completely reacts, collecting a terminal reaction product, cleaning, drying and calcining; ultrasonically dispersing a sensitive material in deionized water, coating a ceramic tube of the sensor with a brush, and calcining; welding a sensitive electrode and a heating wire on a hexagonal base, aging, and starting a test after the resistance of a device is stable. According to the In2O3 folded microspheres provided by the invention, through a spray pyrolysis method and inheritance, the response recovery time of a sensor can be shortened, the selection characteristic and sensitivity of the sensor are improved, the moisture resistance of the sensor is improved, and a new thought is provided for synthesizing a nano material.

Description

technical field [0001] The invention belongs to the technical field of semiconductor oxide gas sensors, and in particular relates to a method and application of indium oxide-based wrinkled microspheres for ethanol detection. Background technique [0002] Currently, drinking and working is very dangerous for high-risk jobs or for drivers in a variety of industries. There is a certain relationship between alcohol intake and the body's exhaled alcohol content. Moreover, ethanol is a flammable organic volatile gas, so it is very necessary to monitor the leakage point. The detection of ethanol has the following requirements: high sensitivity, fast response and recovery time, work under high humidity, and unique selection characteristics for ethanol in the face of various gases. [0003] Currently, technologies for ethanol detection include: surface acoustic microwave gas sensor, chromatography / mass spectrometry (GC / MS), spectrometry, etc. However, these techniques still have s...

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Problems solved by technology

[0006] (1) In the existing technology for detecting ethanol, there are problems such as large instrument volume, high working temperature and complicated operation, and the sensitivity of detecting ethanol is not high

[0007] (2) The sensitivity of most semiconductor oxides will be greatly reduced under high humidity, which is very unfavorable for gas detection under high humidity

[0008] (3) The working temperature of existing semiconductor metal oxide gas sensors is relatively high; and the experimental steps for preparing sensitive materials are complicated, and it is usually necessary to add a variety of directing agents or multi-step experiments

[0009] (4) As a typical n-type semiconductor In 2 o 3 , poor selectivity in the face of different gases, especially ethanol and acetone

For pure In without Sb ions 2 o 3 samples, the sensitivity drops dramatically at high humidity

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