Functionalized titanium dioxide/chlorella nano composite material based on graphene quantum dots and preparation method and application thereof

A technology of graphene quantum dots and composite materials, which is applied in the field of gas sensors, can solve the problems of poor gas sensitivity and achieve the effects of rapid response, high sensitivity and strong nano-effect

Active Publication Date: 2020-11-17
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 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 this type of gas sensor The gas-sensing performance of gas-sensing materials under low temperature conditions is often very poor, and they need to work under heating conditions and the working temperature is relatively high. It is particularly important for the target gas to have gas-sensitive materials with stable and reliable sensing response, fast and accurate, high sensitivity and high selectivity

Method used

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  • Functionalized titanium dioxide/chlorella nano composite material based on graphene quantum dots and preparation method and application thereof
  • Functionalized titanium dioxide/chlorella nano composite material based on graphene quantum dots and preparation method and application thereof
  • Functionalized titanium dioxide/chlorella nano composite material based on graphene quantum dots and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] The present invention is used for the composite film material of gas sensor, and preparation method is as follows:

[0064] Step 1: Carbonization of Chlorella:

[0065] Put the ceramic boat filled with chlorella into the tube furnace, first vacuumize, keep it for 8 minutes (5~10 minutes are acceptable), and then pass through the protective gas (for example, nitrogen atmosphere), and keep the gas flow rate at 100SCCM ( 50-200 SCCM is acceptable), followed by high-temperature roasting at 800°C (700-900°C is acceptable) for 3 hours (1-5 hours are acceptable) to prepare Carbonized Chlorella.

[0066] Step 2: Preparation of gold nanoparticles

[0067] First, add 3.0×10 to the beaker -2 mol / L (the concentration range is 5×10 -3 ~5×10 -2 mol / L is acceptable, preferably 1.2×10 -2 ~5×10 -2 mol / L) of chloroauric acid solution 10mL, 6×10 -4 mol / L (the concentration range is 1×10 -4 ~1×10 -3 mol / L is acceptable, preferably 5×10 -4 ~8×10 -4 mol / L) PVP solution 5mL and dei...

Embodiment 2

[0083] Preparation of composite materials

[0084] Add 3 g of tetrabutyl titanate and 100 mg of carboxylated graphene quantum dots to 10 ml of propanol and stir magnetically at room temperature for 36 hours, then ultrasonically disperse for 15 minutes, then add 6 ml of gold nanoparticles in propanol (concentration of 4 mg / ml) (the gold nanoparticles were prepared by the method in Example 1) was added to the above mixture, and then ultrasonically dispersed for 15 minutes to uniformly prepare a mixed solution. The mixed solution was evaporated by bubbling, and when the solution was reduced to 6 ml, 60 mg of Chlorella carboniferous (prepared by the method in Example 1) was added. After spin-coating, dry at 60-80°C for 2 hours, repeat the coating 4 times and dry. Put the coated device into an airtight container, adjust the humidity inside the container between 75%~85% and the temperature at 120°C~130°C, and take out the device after 48 hours of treatment. Oxygen plasma treatmen...

Embodiment 3

[0091] Preparation of composite materials

[0092] Add 1 gram of titanium tetrachloride and 60 mg of hydroxylated graphene quantum dots to 5 ml of isopropanol and stir magnetically at room temperature for 24 hours, then ultrasonically disperse for 10 minutes, then add 2 ml of gold nanoparticle isopropanol solution (concentration: 5 mg / ml) (the gold nanoparticles were prepared by the method in Example 1) was added to the above mixture, and then ultrasonically dispersed for 10 minutes to obtain a uniform mixture. The mixed solution was evaporated by bubbling, and when the solution was reduced to 3 ml, 30 mg of Chlorella carboniferous (prepared by the method in Example 1) was added. After spin-coating, dry at 60-80°C for 1.5 hours, repeat the coating 4 times and dry. Put the coated device into an airtight container, adjust the internal humidity of the container between 75%~85% and the temperature at 120°C~130°C, and take out the device after 36 hours of treatment. Oxygen plasma...

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Abstract

The invention discloses a functionalized titanium dioxide/chlorella nano composite material based on graphene quantum dots. The composite material is formed by compounding titanium dioxide nano-crystalline grains, functionalized graphene quantum dots, carbonized chlorella and gold nano-particles; and the composite material is in a film shape, and protrusions formed by the carbonized chlorella andthe titanium dioxide nano-crystalline grains are arranged on the surface of the composite material. According to the functionalized titanium dioxide/chlorella nano composite material based on the graphene quantum dots provided by the invention, the graphene quantum dot functionalized titanium dioxide/chlorella is used as the basis for preparing a film sensing material for the first time, comparedwith traditional materials, the film sensing material has excellent sensitivity and selectivity, and when the film sensing material is used as the material for preparing a gas sensitive sensor, the development requirements of miniaturization and integration can be realized in the future application.

Description

technical field [0001] The invention relates to the field of gas sensors, in particular to a graphene quantum dot-based functionalized titanium dioxide / chlorella nanocomposite material and a preparation method thereof. Background technique [0002] TiO 2 As a classic semiconductor metal oxide, it is used in many fields, including gas sensors, solar cells, optoelectronic devices, etc., and its performance in gas sensors is more prominent. The structure determines the properties. Over the years, material researchers have used many different methods to synthesize TiO with many different microscopic morphologies. 2 Materials, including sheet-like, spherical, porous, etc., but their synthesis direction is the same, they are all working toward higher specific surface area, smaller size, or more exposed active sites. TiO 2 After the nanoparticle size is less than 10nm, thanks to its tiny size, strong nano-effect, and high surface energy, it just meets the requirements of large s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/12B22F9/24C01B32/05G01N27/12B82Y30/00B82Y40/00
CPCC23C18/1216C23C18/127B22F9/24C01B32/05G01N27/127B82Y30/00B82Y40/00
Inventor 邵绍峰林纪栋夏雨萱刘星宇
Owner NANJING UNIV OF INFORMATION SCI & TECH
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