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Thin film based on two-dimensional trititanium dicarbide/titanium dioxide heterojunction and preparation method and application of thin film

A technology of trititanium dioxide and titanium dioxide, which is applied in the direction of titanium dioxide, titanium carbide, chemical instruments and methods, etc., can solve the problems of low photothermal conversion, difficulty in mass production, and limitation of the application of two-dimensional MXene materials, so as to promote the transfer of power The effect of improving the performance of light and heat conversion

Active Publication Date: 2021-12-21
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the lateral dimensions of 2D MXene sheets are generally less than 5 μm, so that they usually have to be assembled into stacked 2D MXene forms (such as filter membranes and porous foam membranes) in applications to absorb enough light energy to meet practical demands. The requirements of application scenarios; and, the internal thermal resistance caused by the stacked form of two-dimensional MXene makes its light-to-heat conversion significantly lower than that of two-dimensional MXene nanosheets; in addition, two-dimensional MXene is restricted by its preparation method, and it is difficult to achieve mass production
The above factors severely limit the further application of 2D MXene materials in the field of photothermal

Method used

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  • Thin film based on two-dimensional trititanium dicarbide/titanium dioxide heterojunction and preparation method and application of thin film
  • Thin film based on two-dimensional trititanium dicarbide/titanium dioxide heterojunction and preparation method and application of thin film
  • Thin film based on two-dimensional trititanium dicarbide/titanium dioxide heterojunction and preparation method and application of thin film

Examples

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preparation example Construction

[0027] The invention provides a two-dimensional Ti based 3 C 2 / TiO 2 A method for preparing a heterojunction thin film, comprising the following steps:

[0028] Provide a suspension of two-dimensional titanium carbide nanosheets;

[0029] Suction-filtering the two-dimensional titanium dicarbide nanosheet suspension to obtain a titanium dicarbide thin film;

[0030] Anneal the titanium dioxide titanium carbide film under vacuum to obtain a two-dimensional Ti-based 3 C 2 / TiO 2 heterojunction films.

[0031] The invention provides a two-dimensional trititanium carbide nanosheet suspension. In the present invention, the number of layers of the two-dimensional titanium dioxide trititanium carbide nanosheets is preferably a few layers, more preferably 1-3 layers, and even more preferably a single layer. In the present invention, the concentration of the two-dimensional trititanium carbide suspension is preferably 0.1-10 mg / mL, more preferably 4-8 mg / mL. In the present inv...

Embodiment 1

[0054] Based on two-dimensional Ti 3 C 2 / TiO 2 A method for preparing a heterojunction thin film, the steps of which are:

[0055] 300mg single-layer two-dimensional titanium carbide powder (Ti 3 C 2 T x ) was dissolved in 50mL deionized water, and stirred to obtain a monolayer two-dimensional trititanium carbide suspension;

[0056] A water-based mixed cellulose membrane with a pore size of 0.23 μm and a diameter of 5 cm was used as filter paper, and a glass filter bottle with a bottle mouth diameter of 4 cm was used for vacuum filtration, so that the single-layer two-dimensional titanium dioxide in the obtained monolayer two-dimensional trititanium carbide suspension Two-dimension titanium carbide is deposited on the surface of filter paper, and the obtained titanium dioxide film containing filter paper is put into a vacuum drying oven, and dried for 12 hours at a vacuum degree of -0.1MPa and a temperature of 60°C; The trititanium carbide film of the filter paper is r...

Embodiment 2

[0059] The difference from Example 1 is that the annealing temperature is 650° C., and the rest of the steps are the same as in Example 1.

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Abstract

The invention provides a thin film based on a two-dimensional trititanium dicarbide / titanium dioxide heterojunction and a preparation method and application of the thin film, and belongs to the technical field of photothermal conversion materials. According to the method, a two-dimensional trititanium dicarbide suspension liquid is subjected to suction filtration, so that the trititanium dicarbide thin film with the micron-grade thickness is formed, and sufficient light absorption is guaranteed; and then the trititanium dicarbide thin film is annealed in vacuum to form the thin film composed of the two-dimensional trititanium dicarbide / titanium dioxide heterojunction. The heterojunction effectively promotes the transfer kinetics of thermal charges generated by two-dimensional trititanium dicarbide under the illumination condition, and finally the photothermal conversion property of the film is greatly improved. When the two-dimensional trititanium dicarbide / titanium dioxide heterojunction thin film prepared by the invention is used for photo-thermal seawater desalination, on one hand, the compound thin film can efficiently convert solar energy into heat energy; and on the other hand, the compound thin film prepared by the method has excellent salt resistance.

Description

technical field [0001] The invention relates to the technical field of light-to-heat conversion materials, in particular to a two-dimensional trititanium dicarbide / titanium dioxide heterojunction film and its preparation method and application. Background technique [0002] With the continuous reduction of fossil fuels, solar energy has become an important part of people's energy utilization. Photothermal conversion can directly convert solar energy into thermal energy and utilize it, which is one of the main ways to realize the utilization of solar energy. However, since the energy density of solar energy is small and discontinuous after reaching the earth, it brings difficulties for large-scale development and utilization. The photothermal conversion functional material is a material that can effectively utilize solar energy through photothermal conversion, which allows the conversion of light energy into heat energy, so that the photothermal conversion functional materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/14C02F1/10C02F1/08C01G23/047C01B32/921C02F103/08
CPCC02F1/14C02F1/08C02F1/10C01B32/921C01G23/047C02F2103/08C01P2004/04C01P2004/03C01P2002/72C01P2004/80C01P2004/20Y02A20/124Y02A20/142Y02A20/212
Inventor 轩福贞张博威褚天舒
Owner EAST CHINA UNIV OF SCI & TECH
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