Preparation method and application of purple phosphorus/graphene composite material

A composite material and graphene technology, applied in the field of gas sensors, can solve the problems of being unsuitable for on-site real-time detection, inconvenient to carry, and expensive, and achieve the effects of low cost, improved efficiency, and improved electrical conductivity.

Pending Publication Date: 2021-05-07
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are many instruments based on the principle of spectroscopy, such as gas chromatographic analyzers, ultraviolet-visible spectrometers, etc., which can achieve high-precision detection, they are expensive and not easy to carry, so they are not suitable for on-site real-time detection

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  • Preparation method and application of purple phosphorus/graphene composite material
  • Preparation method and application of purple phosphorus/graphene composite material
  • Preparation method and application of purple phosphorus/graphene composite material

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preparation example Construction

[0037] A kind of preparation method of purple phosphorus / graphene composite material of the present invention, comprises the following steps:

[0038] S1. Prepare graphene on the surface of copper foil by chemical vapor deposition. The number of layers of graphene is 2 to 20 layers. Put the copper foil sample loaded with graphene into the etching solution for 2 to 4 hours and wait for the sample to After the copper is completely etched, use filter paper to transfer the graphene to deionized water for 30-60 minutes for cleaning, then transfer to new deionized water for 30-60 minutes, and finally transfer the graphene to the substrate;

[0039] The corrosion solution is a mixed solution of ferric chloride and hydrochloric acid, wherein the ferric chloride solution and the hydrochloric acid solution are mixed at a volume ratio of 1:1, and the concentration is 0.1-1mol / L.

[0040] The substrate is Si / SiO 2 , glass or organic membrane.

[0041] S2. Exfoliate the massive purple ph...

Embodiment 1

[0048]The purple phosphorus was peeled off by physical method and transferred to the surface of graphene to recombine with it, and the adsorption and desorption performance of the purple phosphorus / graphene composite material on carbon monoxide and nitrogen monoxide was detected. Concrete preparation steps are as follows:

[0049] (1) Graphene transfer

[0050] Prepare FeCl with a concentration of 1mol / l 3 / HCl solution is used to etch copper, and the graphene / copper foil with an area of ​​10mm*10mm is cut and placed on the surface of the etching solution. After etching for 2 hours, the graphene was transferred to deionized water with filter paper, soaked for 30 minutes, then transferred to new deionized water, soaked for 30 minutes, and transferred to an organic filter membrane.

[0051] (2) Purple phosphorus stripping

[0052] Put 10 mg of bulk purple phosphorus into a mortar, add a small amount of absolute ethanol and grind until the powder is matte without obvious parti...

Embodiment 2

[0058] The purple phosphorus was peeled off by physical method and then transferred to the surface of graphene to recombine with it, and the adsorption and desorption performance of the purple phosphorus / graphene composite material on nitric oxide was detected. Concrete preparation steps are as follows:

[0059] (1) Graphene transfer

[0060] Prepare FeCl with a concentration of 0.1mol / l 3 / HCl solution is used to etch copper, and the graphene / copper foil with an area of ​​10mm*10mm is cut and placed on the surface of the etching solution. After etching for 3 hours, transfer the graphene to deionized water with filter paper, soak for 40 minutes, then transfer to new deionized water, soak for 40 minutes, and transfer to Si / SiO 2 , Glass substrate.

[0061] (2) Purple phosphorus stripping

[0062] Put 10 mg of bulk purple phosphorus into a mortar, add a small amount of absolute ethanol and grind until the powder is matte without obvious particles. After grinding, the powder...

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Abstract

The invention discloses a preparation method and application of a purple phosphorus / graphene composite material. According to the invention, purple phosphorus is stripped by using a physical method to obtain single-layer or few-layer purple phosphorus; then the purple phosphorus and graphene are compounded by means of suction filtration, spin coating, heat release of an adhesive tape and the like to construct a purple phosphorus / graphene heterojunction; and finally, assembling is conducted to obtain a purple phosphorus / graphene composite gas sensor. According to the invention, the heterojunction is constructed between two materials, electrons are provided by the graphene, and adsorption sites are provided by the purple phosphorus, so the application of the purple phosphorus as the gas sensor for measurement is realized, and compared with pure graphene, resistance change is improved to more than 30 times of the original resistance change; and the preparation process provided by the invention is safe and pollution-free, and the preparation process can be completed in an open environment at normal temperature and normal pressure.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a preparation method and application of a purple phosphorus / graphene composite material. Background technique [0002] In petroleum, chemical, mining and other industries, there are often potential safety hazards caused by flammable, explosive or toxic gases. Once leakage or explosion occurs, it will cause serious casualties and property losses. Secondly, for industries such as smart homes, HVAC equipment, transportation, and environmental monitoring, sensors with high sensitivity, short response time, and high stability are also required as detection methods for smoke concentration and pollution levels. Although there are many instruments based on the principle of spectroscopy, such as gas chromatographic analyzers and ultraviolet-visible spectrometers, which can achieve high-precision detection, they are expensive and not portable, so they are not suitable for o...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B25/02G01N27/12
CPCC01B32/184C01B25/02G01N27/125C01B2204/04C01B2204/22
Inventor 叶晓慧羊奕帆齐明张荔杨艳玲侯小江锁国权冯雷
Owner SHAANXI UNIV OF SCI & TECH
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