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In2O3-carbon dot compound based NO2 sensor and preparation method thereof

A compound and sensor technology, applied in the direction of material electrochemical variables, etc., can solve the problems of limited sensitivity, hindered development, poor selectivity, etc., and achieve the effect of increasing surface chemical reaction, low cost, and improved response

Active Publication Date: 2019-05-03
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pure In 2 o 3 Due to its inherent physical or chemical properties, there are still certain defects, such as limited sensitivity, poor selectivity, etc., which will undoubtedly hinder its further development.

Method used

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  • In2O3-carbon dot compound based NO2 sensor and preparation method thereof
  • In2O3-carbon dot compound based NO2 sensor and preparation method thereof
  • In2O3-carbon dot compound based NO2 sensor and preparation method thereof

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Embodiment 1

[0038] to In 2 o 3 -Carbon dot composite as a sensitive material to make room temperature NO 2 Sensor, its specific production process:

[0039] ①Dissolve 0.6g of urea in 20ml of deionized water to obtain solution A; add 0.3g of indium chloride tetrahydrate and 0.4g of citric acid into 20ml of deionized water to form a homogeneous solution B under continuous stirring; Add B slowly to solution A, and form a mixed solution under magnetic stirring. After stirring continuously for 30 minutes, a mixed solution was synthesized.

[0040] ②The above mixed solution was transferred to a 50ml polytetrafluoroethylene reactor, and the temperature was maintained at 120°C for 12 hours. After the reactor was naturally cooled to room temperature, the solution was centrifuged, and the precipitate was washed three times with deionized water and ethanol. After drying in an oven at 60°C, put the white precipitate on a ceramic boat, and sinter it in a nitrogen sintering furnace heated to 350°C...

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Abstract

The invention discloses an In2O3-carbon dot compound based NO2 sensor and a preparation method thereof, and belongs to the technical field of semiconductor metal oxide gas sensors. The sensor consistsof an Al2O3 ceramic tube whose outer surface has two annular gold electrodes discrete with each other, and an In2O3-carbon dot compound sensitive material thin film which is uniformly coated on the outer surfaces of the annular gold electrodes and Al2O3 ceramic tube. Through the utilization of the gas adsorption capabilities and shielding effects of carbon dots and a synergistic effect between the carbon dots and In2O3, the surface chemical reaction of detected gas can be increased, and charge transfer between the In2O3 and the carbon dots can be formed, and therefore, the sensitive characteristics of the sensor on NO2 can be effectively improved, and the response of the sense can be enhanced by 5 times; and the sensor has excellent effects of being simple in device process, small in sizeand suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of semiconductor metal oxide gas sensors, in particular to a sensor based on In 2 O 3 -NO of carbon dots complex 2 Sensors and methods of making them. Background technique [0002] Normally, the composition of trace gases in the atmosphere is insignificant. However, in a certain range of atmosphere, the appearance of trace substances that do not exist in the first place is likely to have adverse effects and harms on people, animals, plants, objects, materials, etc. When the concentration of pollutants in the atmosphere reaches a harmful level, it can even destroy the ecological system and the conditions for the normal survival and development of human beings, and the phenomenon that causes harm to people or things is called air pollution. There are both natural factors and man-made factors that cause air pollution. Natural factors include smoke, sulfur oxides, nitrogen oxides, etc. produced by volcanic e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
Inventor 高原程明卢革宇
Owner JILIN UNIV
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