Acetone sensor on basis of compounds with rGO/alpha-Fe2O3 heterogeneous structures and method for preparing acetone sensor

Abstract

The invention belongs to the technical field of semiconductor metal oxide gas sensors, in particular to a sensor based on rGO / α-Fe 2 o 3 Acetone sensors of heterostructure composites and methods for their preparation. Preparation of rGO / α-Fe by one-step hydrothermal method 2 o 3 Heterostructure composite sensitive materials, using graphene's high specific surface area, gas adsorption capacity, fast carrier transfer rate and good conductivity and its combination with α-Fe 2 o 3 The heterojunction formed between them increases the chemical reaction of the detected gas and forms the charge transfer between the two, thus effectively improving the sensitivity of the sensor to acetone. In addition, the sensor structure used in the present invention is a commercially available Al with 2 ring-shaped gold electrodes 2 o 3 Insulating ceramic tube, coated with ring-shaped gold electrodes and Al 2 o 3 Semiconductor-sensitive materials on insulating ceramic tubes, and through Al 2 o 3 Composed of Nichrome heating coils in insulated ceramic tubes. The device is simple in process, small in size and suitable for mass production, so it has broad application prospects in detecting the content of acetone in the microenvironment.

Description

technical field [0001] The invention belongs to the technical field of semiconductor metal oxide gas sensors, in particular to a sensor based on rGO / α-Fe 2 o 3 Acetone sensors of heterostructure composites and methods for their preparation. Background technique [0002] VOC is the English abbreviation of volatile organic compounds (volatile organic compounds), which usually refers to organic compounds with a boiling point of 50-260°C and a saturated vapor pressure of more than 133.132KPa at room temperature, including hydrocarbons, halogenated hydrocarbons, oxygen hydrocarbons and nitrogen hydrocarbons Wait. In our daily life, industrial emissions such as industrial exhaust from chemical plants and flue gas from waste incineration contain a variety of VOCs; exhaust from motor vehicles contains incompletely burned hydrocarbons. Interior decoration and decoration materials such as paint and its solvents, wood preservatives, coatings, plywood, etc., can release various volat...

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Problems solved by technology

However, the disadvantages of general selectivity, high power consumption, and poor anti-interference ability also seriously restrict its development. Therefore, doping and modification with semiconductor oxide as the main body has become a very necessary means to solve these problems.

[0005] As a common n-type semiconductor oxide material, α-Fe 2 o 3 It has many advantages such as non-toxicity, low cost, easy synthesis, and high stability. Therefore, it is widely used in the field of gas sensors as a sensitive material. However, most of them are based on α-Fe 2 o 3 All gas sensors have low sensitivity and high optimal operating temperature, which also greatly limits their practical applications.

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