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Bi2S3/TiO2 nanotube array and preparation method thereof

A nanotube array, titanium dioxide technology, used in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of inability to fully utilize natural sunlight, inability to form nanotube-like structures, and insufficient specific surface area. Photocatalytic efficiency, improving photoelectric conversion efficiency, and the effect of large specific surface area

Inactive Publication Date: 2010-10-06
HUNAN UNIV
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Problems solved by technology

However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this voltage range, the nanotube-like structure cannot be formed, which limits the diameter of the nanotube to a certain extent, and the nanotubes prepared in the aqueous solution system The tube wall is thin and easy to break
200410021589.X discloses a preparation method of titanium dioxide nanotube arrays with high aspect ratio. The solute of the electrolyte is fluoride and supporting electrolyte, the solvent is water, and alcohol additives are added. This kind of nanotube is still relatively short, only 250nm long, the specific surface area is not large enough, and it can only absorb light in the ultraviolet region, so it cannot make full use of natural sunlight.

Method used

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  • Bi2S3/TiO2 nanotube array and preparation method thereof
  • Bi2S3/TiO2 nanotube array and preparation method thereof
  • Bi2S3/TiO2 nanotube array and preparation method thereof

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Embodiment 1

[0017] (1) Grinding the surface of the base material, cleaning it for later use;

[0018] (2) Preparation of electrolyte: the electrolyte is composed of hydrofluoric acid and dimethyl sulfoxide or NH with a mass percentage of HF of 0.5-3%. 4 F mass percentage composition is the alcohol solution composition of 0.25-0.5%;

[0019] (3) Under 25-100V DC voltage, using pure titanium or titanium alloy as the anode and platinum sheet as the cathode, electrolytically prepare titanium oxide nanotubes in the electrolyte;

[0020] (4) Calcining the titanium oxide nanotube array prepared above under aerobic conditions at 400°C-500°C for 4-6h to crystallize it into TiO 2 array of nanotubes.

[0021] (5) Bi 2 S 3 Preparation of modified titania nanotube arrays:

[0022] With 0.05mol / L-2mol / L Bi(NO 3 )·5H 2 The sulfur powder of O, 0.1mol / L-3mol / L, the dimethyl sulfoxide of the L-cysteine ​​of 0.12mol / L-3mol / L are plating solution, and taking saturated calomel electrode as reference el...

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Abstract

The invention discloses a semiconductor material -Bi2S3 / TiO2 nanotube array and a preparation method thereof. Dimethyl sulfoxide (DMSO) containing Bi (NO3) . 5H2O (0.05mol / L-2mol / L), sulfur powder (0.1mol / L-3mol / L) and L-cysteine (0.12mol / L-3mol / L) as plating bath, and Bi2S3 crystals are deposited on a TiO2 nanotube array in a three-electrode system. The Bi2S3 / TiO2 nanomaterial with a novel structure can effectively expands the absorption range of TiO2 in a visible light region and reduces the recombination probability of electron hole pair, can produce more photo-generated electrons and photo-generated holes under visible light, and has potential application in solar batteries, solar radiation absorbers, nano switches, thermoelectric photoelectric converters, superconductors, gas sensors and other aspects.

Description

technical field [0001] The invention belongs to the field of environmental functional materials. It specifically relates to a novel and highly efficient environmental functional nanomaterial——Bi 2 S 3 / TiO 2 Nanotube arrays and methods of making them. Background technique [0002] Titanium dioxide nanotube arrays prepared by anodic oxidation have excellent characteristics such as large specific surface area, uniform surface morphology, and adjustable pore diameter. Its special nanotube structure has become a research hotspot in the scientific field of various countries. The electrolyte for preparing titanium dioxide nanotube arrays by anodic oxidation is usually an inorganic aqueous solution system. Since various ions migrate relatively fast in aqueous solution, the electrochemical anodic oxidation is also fast, and nanotube arrays can be formed in a relatively short time. However, the applied anodic oxidation voltage is generally only in the range of 10-25V, beyond this...

Claims

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Application Information

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IPC IPC(8): C25D11/26C25D3/54
Inventor 罗胜联杨丽霞苏芳刘承斌
Owner HUNAN UNIV
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