Nano heterojunction ethylene sensitive film and preparation method and application thereof

A sensitive thin film and heterojunction technology, applied in the field of agricultural information, can solve the problems that limit the application of low-concentration ethylene detection

Pending Publication Date: 2021-08-13
AGRI INFORMATION INST OF CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the nature of the material, high temperature working conditions and large concentration detection range limit the application of low concentration ethylene detection

Method used

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  • Nano heterojunction ethylene sensitive film and preparation method and application thereof
  • Nano heterojunction ethylene sensitive film and preparation method and application thereof
  • Nano heterojunction ethylene sensitive film and preparation method and application thereof

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Effect test

preparation example Construction

[0037] The present invention also provides a preparation method (spraying method) of the nano-heterojunction ethylene-sensitive film described in the above technical solution, comprising the following steps:

[0038] mixing the graphene oxide aqueous solution with the tungsten-based chalcogenide aqueous solution to obtain a mixed solution;

[0039] Preheating the substrate to obtain a preheated substrate;

[0040] spraying the mixed solution on the surface of the preheated substrate to obtain a deposition substrate;

[0041] Annealing the deposition substrate to obtain the nano-heterojunction ethylene-sensitive thin film.

[0042] In the invention, the graphene oxide aqueous solution is mixed with the tungsten series chalcogen compound aqueous solution to obtain a mixed solution.

[0043] In the present invention, the concentrations of the graphene oxide aqueous solution and the tungsten-based chalcogenide aqueous solution are preferably 0.5 mg / mL, and the present invention ...

Embodiment 1

[0070] The nano-heterojunction ethylene sensitive film includes a silicon substrate and a sensitive layer. The sensitive layer includes reduced graphene oxide and tungsten disulfide. The mass ratio of reduced graphene oxide to tungsten disulfide is 1:0.2, and the thickness of the film is 150nm.

[0071] The nano-heterojunction ethylene-sensitive film is prepared by spraying, and the steps are as follows:

[0072] (1) 0.5 mg / mL graphene oxide aqueous solution and 0.5 mg / mL tungsten disulfide aqueous solution are uniformly mixed at a mass ratio of reduced graphene oxide to tungsten disulfide of 1:0.2 to obtain a mixed solution;

[0073] (2) The substrates were ultrasonically cleaned in deionized water, ethanol, and acetone solutions, then dried with nitrogen, and fixed on a hot plate with a temperature of 50°C;

[0074] (3) Nitrogen was used as the carrier gas, the nitrogen flow rate was 8 μL / s, the nitrogen pressure was 18 psi, and the airbrush was fixed 15 cm directly above th...

Embodiment 2

[0078] Nano-heterojunction ethylene sensitive film, including a silicon substrate and a sensitive layer, the sensitive layer includes reduced graphene oxide and tungsten diselenide, the mass ratio of reduced graphene oxide to tungsten diselenide is 1:1, and the film thickness is 60nm .

[0079] The nano-heterojunction ethylene-sensitive thin film is prepared by layer-by-layer self-assembly method, and the steps are as follows:

[0080] (1) Polydiallylammonium chloride is dispersed in deionized water with a mass concentration of 10%; the concentration of graphene oxide aqueous solution is 0.2mg / mL, and the concentration of tungsten diselenide aqueous solution is 0.8mg / mL; the three solutions are respectively Put it into a 20mL beaker;

[0081] (2) The substrates were ultrasonically cleaned in deionized water, ethanol, and acetone solutions, then dried with nitrogen, and fixed on glass slides;

[0082] (3) Put the substrate fixed on the glass slide vertically and slowly into t...

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Abstract

The invention provides a nano heterojunction ethylene sensitive film and a preparation method and application thereof, and belongs to the field of agricultural information. The invention provides the nano heterojunction ethylene sensitive film which comprises a substrate and a sensitive layer, the sensitive layer comprises reduced graphene oxide and a tungsten chalcogenide, the mass ratio of the reduced graphene oxide to the tungsten chalcogenide is 1: 0.2-1, and the tungsten chalcogenide is tungsten disulfide or tungsten diselenide. After the nano heterojunction ethylene sensitive film is in contact with ethylene, the resistance of the nano heterojunction ethylene sensitive film changes, and the concentration of ethylene can be detected by detecting the resistance of the nano heterojunction ethylene sensitive film.

Description

technical field [0001] The invention relates to the field of agricultural information technology, in particular to a nano-heterojunction ethylene-sensitive film, a preparation method and application thereof. Background technique [0002] my country is a big apple producing country, and my country's apple production exceeds half of the world's total production. The improvement of fruit quality plays an important role in enhancing the competitiveness of fruit and promoting the development of apple industry. Ethylene is an important reference index for apple picking, storage, insurance and quality identification. Apples undergo a series of physiological, biochemical and structural changes regulated by ethylene during ripening; ethylene promotes fruit respiration, regulates genes and promotes fruit senescence; mechanical damage to fruits induces ethylene release; from fruit ripening to the optimal harvest date, the quality of apples , respiration, ethylene and aroma release re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/127G01N27/12
Inventor 李娴王洋杜晓松孙洁李哲敏
Owner AGRI INFORMATION INST OF CAS
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