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Air pollutant detector based on graphene infrared emission unit

An air pollutant and infrared emission technology, which is applied in the field of air pollutant detectors, can solve the problems of reduced detection efficiency, small infrared radiation range, and low detection accuracy, and achieve improved radiation intensity and effective infrared radiation range, high Energy conversion efficiency and emissivity, effects of enhancing heat radiation and heat conduction efficiency

Active Publication Date: 2020-09-18
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

At present, the domestic method of testing air quality is mainly based on laboratory chemical analysis. The disadvantages are that the detection cycle is long and the operation is inconvenient, the equipment is bulky and expensive, etc.
The on-site detector mainly adopts the principle of electrochemical sensor detection, the detection accuracy is not high, and it is easily affected by the environment
[0003] At present, there are multi-component gas detectors based on infrared technology on the market, but the infrared emitters commonly used in detectors are small in size, have a small radiation range of emitted infrared light, and low light intensity, which is not suitable for large-scale gas detection.
In addition, due to the small radiation range, it is difficult for the infrared detector to detect the infrared light emitted by the emitter, which reduces the detection efficiency

Method used

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  • Air pollutant detector based on graphene infrared emission unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) The graphene oxide solution with a concentration of 0.1 mg / mL was sprayed at 200° C., and reduced by HI at 80° C. for 8 hours to prepare graphene microspheres. Scanning electron microscope detection proved that graphene microspheres were finally obtained. Raman detection showed that the graphene microspheres had an ID / IG value of 1.1, a scale of 2 μm, and a graphene microsphere wall thickness of 2 atomic layers.

[0027] (2) Get the above-mentioned 1 weight part of graphene microspheres and 100 weight parts of mechanically exfoliated graphene, 0.02 weight parts of polyimide with a molecular weight of 4000, 4 parts by weight of feldspar nanopowder, 0.5 parts by weight of a molecular weight of 9800, branched Hyperbranched carbosilane with a degree of 1.1 and 0.1 parts by weight of dicumyl peroxide were evenly mixed to obtain a mixed coating.

[0028] (3) Centrifugally spray the mixed paint obtained in step (2) into a 4*4cm coating, set the centrifugal force to 4000rcf...

Embodiment 2

[0038] (1) The graphene oxide solution with a concentration of 0.1mg / mL was sprayed at 200°C, reduced by HI at 80°C for 8 hours, and then heat-treated at 2800°C to prepare defect-free graphene microspheres. The scanning electron microscope test proved that the graphene microspheres were finally obtained. The ID / IG value of the graphene microspheres was 0 through Raman detection, and the scale was 2 μm, and the wall thickness of the graphene microspheres was 2 atomic layers.

[0039] (2) Get the above-mentioned 1 weight part of graphene microspheres and 100 weight parts of mechanically exfoliated graphene, 0.02 parts by weight of polyimide with a molecular weight of 2000, 4 parts by weight of feldspar nanopowder, 0.5 parts by weight of a molecular weight of 9800, branched Hyperbranched carbosilane with a degree of 1.1 and 0.1 parts by weight of dicumyl peroxide were evenly mixed to obtain a mixed coating.

[0040] (3) Centrifugally spray the mixed paint obtained in step (2) int...

Embodiment 3

[0048] (1) The graphene oxide solution with a concentration of 1 mg / mL was sprayed at 180° C., and reduced by HI at 100° C. for 2 hours to prepare graphene microspheres. SEM detection proved that spherical highly wrinkled graphene was finally obtained. Raman detection showed that the graphene microsphere had an ID / IG value of 0.8, and its scale was 3 μm, and the wall thickness of the graphene microsphere was 4 atomic layers.

[0049] (2) Get above-mentioned 1 weight part graphene microsphere and 300 weight parts mechanically exfoliated graphene, 0.12 weight part molecular weight is the pitch of 10000, 1 weight part mica nanopowder, 2 weight parts molecular weight is 8000, branching degree is 2 The hyperbranched carbosilane and 0.1 parts by weight of benzoic acid peroxide were uniformly mixed to obtain a mixed coating.

[0050] (3) Spray the mixed paint obtained in step (2) into a 4*4cm coating by centrifugal spraying, set the centrifugal force at 10,000 rcf, and cure it by ult...

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Abstract

The invention provides an air pollutant detector based on a graphene infrared emission unit. Multi-infrared radiation is realized by utilizing a wrinkle-shaped structure of graphene microspheres in amulti-infrared emission coating under the cohesion and combination effects of macromolecules, the heat generation effect of a graphene layer, the insulation effect of an insulation aluminum-silicon compound and cooperation of small-molecule high-radiation inorganic particles; the detection unit is used for receiving infrared light which is emitted from the infrared emission unit and passes throughgas to be detected after being filtered by an optical filter, so that the detection of air pollutants is realized; and the optical filter of the gas detection device can be replaced, and the gas detection device is used for detecting various gases and is simple to operate and low in cost.

Description

technical field [0001] The invention belongs to the technical field of new nanometer materials, and in particular relates to an air pollutant detector based on a graphene infrared emission unit. Background technique [0002] SO produced by air pollution 2 , NO and other toxic gases will cause harm to human health. At present, domestic air quality testing methods are mainly based on laboratory chemical analysis. The disadvantages are that the detection cycle is long and the operation is inconvenient, and the equipment is bulky and expensive. The on-site detector mainly adopts the principle of electrochemical sensor detection, which has low detection accuracy and is easily affected by the environment. [0003] At present, there are multi-component gas detectors based on infrared technology on the market, but the infrared emitters commonly used in detectors are small in size, emit infrared light with a small radiation range and low light intensity, and are not suitable for la...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504C09D1/00C09D7/61C09D7/65C09D7/63
CPCG01N21/3504C09D1/00C09D7/61C09D7/70C09D7/65C09D7/63G01N2021/3133Y02A50/20
Inventor 韩金冯袆平马佳奇仇涛磊钟明强
Owner ZHEJIANG UNIV OF TECH
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