Preparation method of titanium dioxide nanotube array sensitized by cadmium sulfide nanoparticles

Abstract

The invention provides a preparation method of a titanium dioxide nanotube array sensitized by cadmium sulfide nanoparticles, which relates to the preparation method of the titanium dioxide nanotube array. The preparation method comprises the following steps: preprocessing the surface of a substrate material; by taking the mixed solution of water and glycerol containing 0.25-1.0wt% of NH4F as an electrolyte, taking platinum metal as a counter electrode and controlling the voltage at 10-30V, carrying out electrochemical anodic oxidation on the substrate to construct a layer of TiO2 nanotube array film on the surface of the substrate; carrying out heat treatment on the film layer to obtain an anatase TiO2 nanotube array film; and depositing the obtained anatase TiO2 nanotube array film in the DMSO electrolyte of which the S concentration is 0.01-0.05M and the Cd / S concentration ratio is 1:(1-4), and taking out and drying the sample to obtain the titanium dioxide nanotube array sensitized by the cadmium sulfide nanoparticles. The preparation process has simple operation, and the industrialization can be realized easily.

Description

Technical field [0001] The invention relates to a method for preparing a titanium dioxide nanotube array, in particular to a method for preparing a titanium dioxide nanotube array sensitized by visible light-responsive cadmium sulfide nanoparticles at room temperature. Background technique [0002] In recent years, the self-assembly of nanostructures on the surface of metal or semiconductor materials by electrochemical anodization has aroused great research interest. Among them, titanium dioxide (TiO 2 ) Nanotube array films are particularly interesting. The nanotubes in this material are evenly distributed, arranged in a very orderly and regular array, with a large surface area and a high quantum effect. The nanotubes are directly connected to the metal titanium conductive substrate and the bond is firm; the material has a relatively high energy gap. Large, the generated photogenerated electrons and holes have high potentials and strong redox properties. They have the advantage...

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Problems solved by technology

The particle size of CdS prepared by the electrodeposition method is relatively large (>50nm), and the electrolyte used is a dimethyl sulfoxide solution containing saturated sulfur. In order to fully dissolve the sulfur, a certain amount of benzene needs to be added to the electrolyte to increase the sulfur Solubility (S.G.Chen, M.Paulose, C.Ruan, G.K.Mor, O.K.Varghese, D.Kouzoudis, C.A.Grimes, J.Photochem.Photobiol., A2006, 177, 177-184), or at 110 or 50 ℃ and Ultrasound is assisted to improve the solubility of sulfur, but it is unavoidable that excessive sulfur is deposited on the surface of the array film, which reduces the photoelectric conversion efficiency (Chenglin Wang, Lan Sun, HongYun, Jing Li, Yuekun Lai, Changjian Lin, Nanotechnology, 2009, 20: 295601 )

These methods are either highly toxic, or the process is complicated, and high temperature is required to synthesize, so they are not suitable for industrial application.

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