Application of carbon dots in light conversion of agricultural production as agricultural light conversion material

A technology of carbon dots and light conversion, which is applied in the field of agricultural light conversion, can solve the problems of affecting the absorption of visible light by plants, the decrease of light transmittance of materials, and the large size of light conversion agents, so as to achieve stable luminescence performance, small size, increase yield and quality effect

Inactive Publication Date: 2017-04-26
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there are still some problems: (1) the synthesis cost of light-changing agents is high, especially some red light-changing agents, which use rare earth ions as activators, are expensive; (2) the size of light-changing agents is large, which leads to the incorporation After the thin film, the light transmittance of the material decreases, which affects the absorption of visible light by plants

Method used

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  • Application of carbon dots in light conversion of agricultural production as agricultural light conversion material
  • Application of carbon dots in light conversion of agricultural production as agricultural light conversion material
  • Application of carbon dots in light conversion of agricultural production as agricultural light conversion material

Examples

Experimental program
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Effect test

Embodiment 1

[0041] The preparation of carbon dots uses an organic amine and organic acid system. The representative raw materials are silane coupling agent (KH-602) and citric acid. The synthesis method is solvothermal method, which is divided into the following three steps:

[0042] (1) Measure 100mL of KH-602 as a solvent into a 250mL autoclave, then add 10g of anhydrous citric acid, stir for 10min by magnetic force and mix evenly.

[0043] (2) The temperature was raised to 240° C. under the protective gas of nitrogen, and the reaction was carried out for 20 minutes. The color of the solution changed to brownish yellow and the reaction was stopped.

[0044] (3) The reacted product was washed three times with petroleum ether, and refrigerated in the refrigerator for subsequent use.

[0045] The resulting fluorescent carbon dots emit blue light under ultraviolet light, and the fluorescence spectrum is as follows: figure 1 shown. Depend on figure 1 It can be seen that fluorescent carbo...

Embodiment 2

[0047] The preparation of carbon dots adopts an organic amine and organic alcohol system. The raw materials are p-phenylenediamine and ethanol. The synthesis method is a solvothermal method, which is divided into the following three steps:

[0048] (1) Accurately weigh 0.3 g of p-phenylenediamine and 30 mL of ethanol as reactants, and mix them uniformly in the reactor by ultrasonic.

[0049] (2) Move the entire reaction kettle into a blast drying oven, set the reaction temperature to 180°C, and set the reaction time to 12 hours.

[0050] (3) Separating and purifying the cooled reactants to obtain fluorescent carbon dots.

[0051] The resulting fluorescent carbon dots emit red light under ultraviolet light, and the fluorescence spectrum is as follows: image 3 shown. Depend on image 3 It can be seen that fluorescent carbon dots can effectively absorb ultraviolet light around 360nm and invalid yellow light around 520nm, and emit red light around 610nm, which effectively show...

Embodiment 3

[0053] The preparation of carbon dots uses an organic amine and organic alcohol system. The raw materials are ethylenediamine and polyvinyl alcohol. The synthesis method is a hydrothermal method, which is divided into the following four steps:

[0054](1) Weigh 1g of polyvinyl alcohol and dissolve it in 20mL of distilled water, then add 0.75mL of ethylenediamine and mix well in the reaction kettle.

[0055] (2) Put the whole reaction kettle into a blast drying oven, and react at 220° C. for 10 hours. After natural cooling, a brown suspension can be obtained.

[0056] (3) By adding excess acetone, the unreacted polyvinyl alcohol is precipitated and separated by centrifugal suction filtration.

[0057] (4) The carbon dot powder can be obtained through freeze-drying.

[0058] Observation by transmission electron microscope (such as Figure 4 ) prepared carbon dots, the particle size of the carbon dots is about 6nm, indicating that the particle size of the carbon dots is small ...

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Abstract

The invention belongs to the technical field of agricultural light conversion, and discloses an application of carbon dots in the light conversion of agricultural production as an agricultural light conversion material. Carbon dots are directly used as an agricultural light conversion material and applied to agricultural production; an excellent light conversion effect is obtained, and the cost is low. The carbon dots are used as an agricultural light conversion material in the light conversion of agricultural production; and the carbon dots are at least one of red light carbon dot and blue light carbon dot. Compared with other fluorescence materials, the used carbon dots have the advantages of easily-available and abundant raw materials, simple synthesis process, green and environment-friendly technology, and no aftertreatment pollutant, and the industrial massive production can be realized. The prepared fluorescent carbon dots are small in size (less than 10 nm), are nontoxic, have good biocompatibility, a stable luminescent property, and a low cost, can be used as a light conversion agent to promote the production of various crops, and improve the yield and quality of crops.

Description

technical field [0001] The invention belongs to the technical field of agricultural light conversion, and particularly relates to the application of carbon dots as agricultural light conversion materials in agricultural production light conversion. In the present invention, the carbon dots are directly used as agricultural light-converting materials, and the carbon dots are applied in agricultural production to obtain excellent light-converting effects with low cost. Background technique [0002] Sunlight is the energy source for plants to carry out photosynthesis, mainly composed of ultraviolet light, visible light and infrared light. Among them, red light (600-700nm) is conducive to the flowering and fruiting of plants; blue light (400-500nm) promotes the growth of plant stems and leaves; and ultraviolet light (below 400nm) is not conducive to photosynthesis and inhibits plant growth and maturity. Light-converting materials are a class of materials that can convert ultrav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/65C01B32/15B82Y20/00B82Y40/00A01G7/06
CPCA01G7/06B82Y20/00B82Y40/00C01P2004/04C01P2004/64C09K11/65
Inventor 刘应亮游雅琴雷炳富肖勇郑明涛董汉武张浩然
Owner SOUTH CHINA AGRI UNIV
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