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Composite film for achieving efficient photoinduction electron transfer in visible region, preparation method and application

An electron transfer and composite technology, which is applied in the direction of photosensitive equipment, capacitor parts, etc., can solve the problem that the composite film cannot realize electron transfer, and achieve the effect of transfer

Inactive Publication Date: 2014-11-19
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing composite film cannot achieve effective electron transfer from carbon nano-dots to titanium dioxide in the visible region, and to provide a composite film that realizes efficient light-induced electron transfer in the visible region. Method and application

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  • Composite film for achieving efficient photoinduction electron transfer in visible region, preparation method and application
  • Composite film for achieving efficient photoinduction electron transfer in visible region, preparation method and application
  • Composite film for achieving efficient photoinduction electron transfer in visible region, preparation method and application

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preparation example Construction

[0034] The preparation method of the nitrogen-doped carbon nano-dots preferably includes:

[0035] Step 1: Mix and dissolve citric acid and urea in deionized water to obtain a transparent solution;

[0036] Step 2: microwave the mixed solution obtained in step 1 to obtain brown-black viscous liquid;

[0037] Step 3: drying, dissolving, and centrifuging the brown-black viscous liquid obtained in Step 2 to obtain nitrogen-doped carbon nano-dots.

[0038]The mass ratio of citric acid and urea in the present invention is preferably 1:2, the microwave heating power of step 2 is preferably 500-900W, and the heating time is preferably 5-10 minutes; The liquid is dried, then dissolved in deionized water, and centrifuged to remove large insoluble aggregates of carbon nano-dots to obtain nitrogen-doped carbon nano-dots. The centrifugal speed is preferably 8000 rpm.

[0039] The present invention also provides a method for preparing a composite film capable of realizing high-efficienc...

Embodiment 1

[0049] ① Mix and dissolve citric acid and urea in deionized water at a mass ratio of 1:2 to obtain a transparent solution;

[0050] ②The mixed solution obtained in ① was reacted by microwave heating for 5 minutes, the heating power was 700w, and a brown-black viscous liquid was obtained;

[0051] ③Dry the brown-black viscous liquid obtained in ②, dissolve it in deionized water, and centrifuge three times at a speed of 8000 rpm to remove larger insoluble aggregates of carbon nano-dots to obtain nitrogen-doped carbon nano-dots.

[0052] figure 1 It is the mass absorption coefficient spectrogram of nitrogen-doped carbon nano-dot (label 1 curve) and commercialized CdSeZnS quantum dot (label 2 curve) used in the present invention, from figure 1 It can be seen that the absorption ability of the nitrogen-doped carbon nano-dot material of the present invention to visible light is much higher than that of traditional semiconductor quantum dots.

Embodiment 2

[0054] ① Spin-coat a transparent ITO conductive film on a glass substrate;

[0055] ②Using the transparent ITO conductive film as the electron extraction layer, the titanium dioxide slurry was spin-coated on the glass substrate containing the ITO film at a spin-coating speed of 2000 rpm (the spin-coating time was 70s) to obtain a titanium dioxide film, and the titanium dioxide film was placed Calcining in a muffle furnace at a temperature of 500°C for 45 minutes to obtain a titanium dioxide film with a nano-mesoporous structure;

[0056] ③ Soak the titanium dioxide film with nano-mesoporous structure obtained in ② in the aqueous solution of carbon nano-dots for 6 hours, absorb carbon nano-dots as the photosensitive layer, the concentration of carbon nano-dots is 5 mg per milliliter, and then rinse the film repeatedly with deionized water. The thin film is used to remove the carbon nano-dots that are not adsorbed on the titanium dioxide, and after natural drying, a composite th...

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Abstract

The invention provides composite film for achieving efficient photoinduction electron transfer in a visible region, a preparation method and application, and belongs to the field of nanometer material science. The composite film is characterized in that transparent conductive oxide film serves as an electron extraction layer, citric acid serves as a carbon source, urea serves as a nitrogen source, nitrogen-doped carbon nanodots synthesized according to a microwave method serve as a photosensitive layer, and the photosensitive layer is compounded with a titanium dioxide electron separation layer of a nanometer mesoporous structure, so that the composite film is prepared. According to the composite film, with the help of oxygen molecules in air, efficient photoinduction charge separation from the carbon nanodots to titanium dioxide can be achieved, and the composite film can be applied to air purification and preparation of high-performance carbon-based solar cells, also shows the good dye light degradation characteristic in water, and can be used for water pollution control.

Description

technical field [0001] The invention belongs to the field of nanometer material science, and specifically relates to a composite thin film for realizing high-efficiency light-induced electron transfer in a visible region, a preparation method and an application. Background technique [0002] The increasingly prominent energy and environmental problems in the world have made people quickly focus on the field of photovoltaics and photocatalysis. Due to its good chemical stability, low cost, no pollution and many other excellent properties, semiconductor titanium dioxide has been widely used as the original photosensitive material in the field of solar cells and photocatalysis. However, because titanium dioxide's wide band gap (3.2eV) limits its absorption of sunlight, the energy conversion efficiency and photocatalytic performance of titanium dioxide-based solar cells are extremely low. In view of this, researchers are trying their best to broaden the absorption spectrum of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/20H01G9/004
Inventor 曲松楠孙明烨
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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