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Room-temperature NO2 sensor based on graphene-coated alpha-Fe2O3 compound and preparation method thereof

A graphene-coated, -fe2o3 technology, applied in the direction of instruments, scientific instruments, measuring devices, etc., can solve the problems of high working temperature and limited practical application, and achieve low cost, suitable for mass production, fast carrier The effect of migration rate

Inactive Publication Date: 2018-04-27
JILIN UNIV
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Problems solved by technology

However, most α-Fe-based 2 o 3 The gas sensors have a high operating temperature, which greatly limits its practical application, in addition, the currently developed α-Fe based 2 o 3 The gas sensor is widely used in ethanol, acetone, H 2 Detection of gases such as S, based on α-Fe 2 o 3 NO 2 Sensors have long been underreported

Method used

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  • Room-temperature NO2 sensor based on graphene-coated alpha-Fe2O3 compound and preparation method thereof
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  • Room-temperature NO2 sensor based on graphene-coated alpha-Fe2O3 compound and preparation method thereof

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Embodiment 1

[0041] Α-Fe coated with graphene 2 O 3 The compound is used as a sensitive material to make room temperature NO 2 Sensor, its specific production process:

[0042] 1. Add 182 mg of ferric nitrate nonahydrate to 20 mL of deionized water and stir for 45 minutes to obtain a uniform ferric nitrate solution; take 10 mg of freeze-dried graphene oxide powder and add it to 20 mL of deionized water and ultrasonicate for 45 minutes to obtain Homogeneous and transparent graphene oxide solution; take 10mL of graphene oxide solution and slowly add dropwise to the above 20mL ferric nitrate solution, and continue to stir for 45 minutes; then, the resulting mixed solution is reacted in a water bath at 80°C for 6 hours to obtain a homogeneous, Viscous dark red solution;

[0043] 2. The dark red solution obtained in step 1 was hydrothermally reacted at 180℃ for 16 hours, cooled to room temperature and centrifuged at high speed to obtain a precipitate. The precipitate was washed with deionized water ...

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Abstract

The relates to a room-temperature NO2 sensor based on graphene-coated alpha-Fe2O3 compound and a preparation method thereof, which belong to the technical field a semiconductor metal oxide gas sensor.The sensor comprises a sold Al2O3 insulation ceramic tube having two annular gold electrodes, a semiconductor sensitive material coating the annular gold electrode and the Al2O3 insulation ceramic tube, and a nickel-chromium alloy heating coil passing through the Al2O3 insulation ceramic tube. The graphene-coated alpha-Fe2O3 compound sensitive material is obtained by water bath and a hydrothermalmethod, a high specific surface area of graphene, gas adsorption capability, a fast carrier migration rate and good conductivity, and heterojunction formed between graphene and the alpha-Fe2O3 are used, so that a chemical reaction of the surface of detected gas is increased, charge transfer between rGO and alpha-Fe2O3 is formed, sensitive characteristic of the sensor on NO2 is effectively increased, work temperature of the sensor is reduced to room temperature, and the sensor has a wide application prospect on the NO2 content aspect in detection microenvironment.

Description

Technical field [0001] The invention belongs to the technical field of semiconductor metal oxide gas sensors, and in particular relates to a graphene-coated α-Fe 2 O 3 Room temperature NO of the complex 2 Sensor and its preparation method. Background technique [0002] The pollution of nitrogen oxides to the environment has become an increasingly serious global problem. Nitrogen oxides, as a kind of air pollutants, mainly include N 2 O, NO, N 2 O 3 , NO 2 , N 2 O 4 And N 2 O 5 , Among which the main air pollution is NO and NO 2 Therefore, nitrogen oxides in environmental science are generally the general term for the two. There are two main sources of nitrogen oxides in the atmosphere: on the one hand, it is produced by natural processes such as nitrogen-fixing bacteria and lightning in nature. On the other hand, it is produced by human activities. Among the nitrogen oxides produced by human activities, more than 90% are produced by the high-temperature combustion of fuels such ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 卢革宇张博高原刘方猛孙鹏梁喜双马健
Owner JILIN UNIV
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