Preparing method for Cu2O nano particle/TiO2 nano tube array composite heterojunction film

Abstract

The invention discloses a preparing method for a Cu2O nano particle / TiO2 nano tube array composite heterojunction film, and belongs to the technical field of semiconductor nano structure preparing. Firstly, an anode oxidization method is adopted for preparing a highly-orderly and dense-arrangement titanium dioxide nano tube array, a cupric acetate precursor solution enters a nano tube through an immersing manner, finally, the precursor is decomposed through heat treatment, p type Cu2O nano particles are obtained and loaded into the nano tube wall, and the Cu2O nano particle / TiO2 nano tube array heterojunction film with the visible-light response is formed. The beneficial effects that the method is simple, cost is low, repeatability is good, and large-scale production can be achieved are achieved; and the obtained heterojunction has wide application prospects in the aspects of photocatalysis, sensors and solar batteries.

Description

technical field [0001] The invention belongs to the technical field of preparation of semiconductor nanostructures, in particular to a narrow-band semiconductor Cu 2 O nanoparticles and broadband semiconductor TiO 2 A method for preparing a composite heterojunction film formed by a nanotube array. Background technique [0002] Due to its excellent chemical and physical properties, TiO as a wide bandgap semiconductor 2 , has a wide range of research and applications in many aspects, such as photocatalysis, solar cells, lithium-ion batteries, gas sensors, water splitting and hydrogen production. At present, the recognized "gold catalyst" in the field of catalysis is made of rutile / anatase TiO 2 Nanoparticle composition. [0003] Currently, there are two main issues restricting TiO 2 Further development and application in photocatalysis and other fields: First, its wide bandgap (~3.2eV) makes it photocatalytic only in the ultraviolet band, but cannot respond to most of the...

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Problems solved by technology

[0003] Currently, there are two main issues restricting TiO 2 Further development and application in photocatalysis and other fields: First, its wide bandgap (~3.2eV) makes it photocatalytic only in the ultraviolet band, but cannot respond to most of the energy in sunlight , which greatly limits its application; methods such as doping and recombination to generate heterojunctions are usually used to shorten its forbidden band width

This brings up the second problem, that is, how to choose a suitable doping method. At present, semiconducting heterojunctions are generally prepared by chemical co-precipitation. Although the method is simple, the preparation is a powder material. The separation and recovery steps require additional resources; while the electrodeposition method prepares heterojunctions, in the process of electrode oxidation, the growth of heterojunctions is related to current density, electrode spacing, electrode immersion depth, and electrolyte uniformity. , ambient temperature and other conditions are closely related, it is difficult to solve the uniformity problem of a large number of samples, and it is not suitable for industrial production of TiO 2 Heterojunction photocatalyst and other products

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