Titanium oxide nano tube and preparing method thereof

Abstract

The invention relates to a Ti oxide nano tube and preparing method. Its character: using TiO2 of various crystal shapes as raw material, and making ultrasonic processing, hydrothermal reaction and after treatment in NaOH solution to obtain titanic acid nano tube, and then baking to form TiO2 nano tube with anatase structure. The TiO2 nano tube has uniform appearance, small tube diameter and large specific surface area. It has wide applied prospect in the fields of photocatalysis, environmental purification, solar cell, gas and wet sensitive materials, etc. It has low energy consumption, simple device, and easy controlled condition, easy to realize large-scale industrial production.

Description

technical field [0001] The invention relates to a titanium oxide nanotube and a preparation method thereof, belonging to the technical field of nanomaterial preparation. Background technique [0002] In 1991, Japanese scientist Iijima discovered carbon nanotubes. Due to their special chemical, physical and mechanical properties, carbon nanotubes have attracted the attention of scientists from all over the world. Carbon nanotubes usually need to be produced at high temperature. Following carbon nanotubes, nanomaterials with one-dimensional structures such as nanotubes, nanowires, and nanorods have become research hotspots. [0003] TiO 2 It is an oxide semiconductor material with a wide range of uses, and has broad application prospects in photocatalysis, environmental purification, catalyst carriers, lithium-ion batteries, gas sensors, and solar cells. TiO 2 There are three crystal forms, namely anatase, rutile and brookite. Due to TiO 2 Wide range of applications, peopl...

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Problems solved by technology

Synthesis of TiO by Template Method 2 The morphology of nanotubes is directly affected by the uniformity and thickness of the pore structure of the template. At the same time, the synthesis process also has a great influence on the product, and the condition control requirements are relatively strict. For example, the morphology of the product is very sensitive to the time of impregnation. To obtain Nanotubes, the impregnation time is very short, usually a few seconds, so it is difficult to achieve industrial mass production

The shorter the immersion time, the thinner the tube wall obtained, and the longer the immersion time, only nanowires can be obtained, and the obtained nanotubes are usually amorphous TiO 2 , and the tube wall is usually composed of nanoparticles, due to the limitation of the template, the diameter of the nanotube is relatively large, and the specific surface area is relatively small, and the sol-gel method usually requires expensive organic alkoxides as raw materials. High cost, not suitable for mass production

[0006] Organogel method: M.Adachi et al. used organic alkoxides of titanium as raw materials and organic ammonium surfactants as templates to synthesize TiO through a sol-gel process. 2 Nanotubes (Chemistry Letters, Chemistry Letters, 2000, page 942), the process of this method is more complicated, and the condition control is harsher, and the nanotubes prepared are usually amorphous structures, and the raw materials used are mostly organic matter, and are more expensive, so it is not suitable for mass production

[0007] Electrochemical anodic oxidation method: Recently, the Journal of Materials Research (Journal of Materials Research, 2001, Volume 16, page 3331) reported the preparation of TiO by electrochemical anodic oxidation 2 Nanotube arrays are used for gas-sensing or humidity-sensing elements. The diameter of the prepared nanotubes is relatively thick, and the tube walls are made of nano-TiO 2 Particle composition, the specific surface area is relatively small, which limits its application field

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