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Graphene quantum dot/ZnO/chlorella composite film and preparation method and application thereof

A graphene quantum dot, composite film technology, applied in graphene, measuring devices, zinc oxide/zinc hydroxide and other directions, can solve the problems of low sensitivity, poor gas sensing performance, poor selectivity, etc.

Pending Publication Date: 2021-07-06
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Semiconductor gas sensor is a common gas sensor, because of its advantages of miniaturization, real-time monitoring, simple use, low price, and high precision, it is widely used in places that need real-time monitoring of gas; but based on metal oxide Semiconductor gas sensors often require a higher operating temperature (200-400°C) to enable the device to obtain better sensing performance. Unstable and reliable, slow response, low sensitivity, poor selectivity

Method used

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  • Graphene quantum dot/ZnO/chlorella composite film and preparation method and application thereof
  • Graphene quantum dot/ZnO/chlorella composite film and preparation method and application thereof
  • Graphene quantum dot/ZnO/chlorella composite film and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Put the ceramic boat filled with chlorella into the tube furnace, vacuumize and keep it for 10 minutes, then pass in nitrogen gas, keep the gas flow rate at 200SCCM, and then bake at 850°C for 2 hours to obtain carbonized pellets Algae;

[0035] (2) Add 5mL concentration of 3.0×10 to the beaker -2 mol / L chloroplatinic acid solution, 12mL concentration is 6×10 - 4 mol / L PVP solution and 25mL dimethylsulfoxide DMSO, the mixture was stirred at 70°C for 10 minutes, and 7.5mL 3.0×10 - 2 mol / L sodium ascorbate solution, stirred at 70°C for 10 minutes, cooled to room temperature, centrifuged the cooled sample, washed three times with acetone, and washed once with ethanol to obtain platinum nanoparticles; Ultrasonic dispersion in 3mL ethylene glycol to obtain a solution of platinum nanoparticles in ethylene glycol with a concentration of 5mg / mL;

[0036] (3) Add 1 g of zinc acetate and 70 mg of nitrogen-doped graphene quantum dots into 8 mL of ethylene glycol and stir ...

Embodiment 2

[0044] (1) Put the ceramic boat filled with chlorella into the tube furnace, vacuumize and keep it for 10 minutes, then pass in nitrogen gas, keep the gas flow rate at 200SCCM, and then bake at 800°C for 2.5 hours to obtain carbonized pellets Algae;

[0045] (2) Add 5mL concentration of 3.0×10 to the beaker -2 mol / L chloroplatinic acid solution, 6mL concentration is 6×10 - 4 mol / L PVP solution and 25mL dimethylsulfoxide DMSO, the mixture was stirred at 70°C for 10 minutes, and 7.5mL 3.0×10 - 2 mol / L sodium ascorbate solution, stirred at 70°C for 10 minutes, cooled to room temperature, centrifuged the cooled sample, washed three times with acetone, and washed once with ethanol to obtain platinum nanoparticles; Ultrasonic dispersion in 3mL ethylene glycol to obtain a solution of platinum nanoparticles in ethylene glycol with a concentration of 5mg / mL;

[0046] (3) Add 1g of zinc acrylate and 70mg of sulfur-doped graphene quantum dots into 10mL of ethylene glycol and stir ma...

Embodiment 3

[0052] (1) Put the ceramic boat filled with chlorella into the tube furnace, vacuumize it and keep it for 10 minutes, then inject nitrogen gas, keep the gas flow rate at 200 SCCM, and then bake at 900°C for 1.5 hours to obtain carbonized pellets Algae;

[0053] (2) Add 10mL concentration of 3.0×10 to the beaker -2 mol / L chloroplatinic acid solution, 20mL concentration is 6×10 - 4 mol / L PVP solution and 50mL dimethylsulfoxide DMSO, the mixture was stirred at 70°C for 8 minutes, and 15mL 3.0×10 - 2 mol / L sodium ascorbate solution, stirred at 70°C for 8 minutes, cooled to room temperature, centrifuged the cooled sample, washed three times with acetone, and washed once with ethanol to obtain platinum nanoparticles; Ultrasonic dispersion in 3mL ethylene glycol to obtain a solution of platinum nanoparticles in ethylene glycol with a concentration of 5mg / mL;

[0054] (3) Add 1 g of zinc methacrylate and 60 mg of sulfur-doped graphene quantum dots into 6 mL of ethylene glycol and...

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Abstract

The invention discloses a graphene quantum dot / ZnO / chlorella composite film as well as a preparation method and application thereof. The film comprises the following elements in percentage by weight: 15-21% of zinc oxide nanocrystals, 60-69% of carbonized chlorella, 4-10% of graphene quantum dots and 2-10% of platinum nanoparticles. The preparation method of the film comprises the following steps of: (1) preparing carbonized chlorella; (2) preparing a platinum nanoparticle low-carbon alcohol solution; (3) adding a zinc precursor and graphene quantum dots into the low-carbon alcohol, uniformly stirring, performing ultrasonic dispersion, adding platinum nanoparticles, and uniformly performing ultrasonic dispersion to obtain a mixed solution; (4) adding the carbonized chlorella, and uniformly stirring to obtain a mixed solution; (5) spin-coating a device substrate with an interdigital electrode with the mixed solution, and sequentially carrying out post heat treatment and oxygen plasma treatment; and (6) carrying out heat treatment to obtain the composite film. The film is high in sensitivity and low in detection limit, the sensitivity to methanol with the concentration of 50ppb is 3.3, and the film has excellent selectivity to methanol.

Description

technical field [0001] The present invention relates to a composite film and its preparation method and application, more specifically, to a graphene quantum dot / ZnO / chlorella composite film and its preparation method and application. Background technique [0002] Air pollution, water pollution, and soil pollution are the three major pollutions that threaten the normal life of human beings. In recent years, with the development of industry and the increase of population, air pollution has become more and more serious, especially indoor VOCs pollution. Being indoors for a long time, VOCs exceeding the standard has seriously threatened the healthy life of ordinary people. In addition, some endogenous VOCs in trace amounts of volatile organic compounds in human exhaled breath can be used as clinical biomarkers. In the current complex air pollution environment, the accurate calibration of endogenous VOCs in exhaled air is very important for both the analysis of exhaled air and ...

Claims

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Application Information

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IPC IPC(8): C01B32/184C01B32/15C01G9/02G01N27/12B82Y30/00B82Y40/00
CPCC01B32/184C01B32/15C01G9/02G01N27/127B82Y30/00B82Y40/00C01P2004/03C01P2004/04C01P2002/82C01P2002/72C01P2004/64
Inventor 邵绍峰林纪栋夏雨萱刘星宇
Owner NANJING UNIV OF INFORMATION SCI & TECH