Fabrication method of hydrogen sensor based on composite titania nanotubes

A technology of titanium dioxide and nanotubes, which is applied in the field of hydrogen sensor preparation based on composite TiO2 nanotubes, can solve problems such as high working temperature and limited sensor application fields, and achieve the effects of convenient operation, reasonable process steps, and novel design

Inactive Publication Date: 2011-12-28
SOUTHEAST UNIV
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Problems solved by technology

[0006]TiO2 nanotube array hydrogen sensors have good sensitivity and selectivity, but require high operating temperature, which limits the Application fields of class sensors

Method used

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  • Fabrication method of hydrogen sensor based on composite titania nanotubes
  • Fabrication method of hydrogen sensor based on composite titania nanotubes
  • Fabrication method of hydrogen sensor based on composite titania nanotubes

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Embodiment 1

[0029] The hydrogen sensor preparation method based on composite titanium dioxide nanotubes of the present invention comprises the following steps:

[0030] Step 1, the high-purity titanium sheet is pretreated, which includes the following steps:

[0031] 1.1. The oxide layer on the surface of the pure titanium sheet to be treated is removed by conventional mechanical processing. The high-purity titanium sheet is a disc with a flat diameter of 17 mm and a thickness of 0.5 mm.

[0032] The high-purity titanium sheet is an industrial pure titanium sheet with a purity of 99.9%-99.9999%. In the actual processing process, mechanical grinding is used to remove the oxide layer on the surface of the pure titanium sheet to be processed, and collectively, 600# and 1000# water sandpaper are used sequentially Perform mechanical grinding to remove the oxide layer on the pure titanium surface.

[0033] 1.2. Soak the machined high-purity round titanium sheet in a hydrochloric acid solution...

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Abstract

A preparation method of a titanium dioxide nanotube based hydrogen sensor comprises steps of: pretreatment on high purity titanium sheets; a first anodic oxidization on titanium sheets; a second anodic oxidization on the titanium sheets; an annealing treatment on titanium sheets with TiO2 nanotubes grown on, after the second anodic oxidization; deposition of precious metals Pt and Pd on the TiO2 nanotubes treated with the high temperature annealing to obtain the hydrogen sensor. A preparation technology of the method is simple, conveniently operated and reasonably designed; the TiO2 nanotube array hydrogen sensor has good sensitivity and selectivity, but requires a high operating temperature, so as to restrict application fields of the sensor. Noble metal coatings of platinum and palladium are compounded on the TiO2 nanotubes; the noble metal coatings have strong absorptivity to H2 and dissociation on H2 absorbed thereon, so as to accelerate interaction between dissociated H and the TiO2 nanotube surfaces, further enhance TiO2 sensitivity to H2, and effectively promote practicability process of the TiO2 nanotube array based hydrogen sensor.

Description

[0001] technical field [0002] The invention belongs to the technical field of hydrogen sensor preparation, in particular to a composite TiO-based 2 Nanotube hydrogen sensor preparation method. [0003] Background technique [0004] In recent years, due to the wide application of hydrogen in fuel cells, chemicals, semiconductors, food processing and petroleum industries, people have paid great attention to the safety of its use, and the existing oxide semiconductor hydrogen sensors have high energy consumption. , low sensitivity and other shortcomings, and it is not suitable for hydrogen monitoring in complex environments, so the development of room temperature hydrogen sensors with high sensitivity, high selectivity and high stability is one of the problems that need to be urgently solved in the hydrogen application industry. [0005] with nano TiO 2 powder compared to TiO 2 Nanotubes have larger specific surface area and stronger adsorption capacity, thus exhibiting h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12C25D11/26B82Y40/00B82Y30/00C25D5/10C25D3/50
Inventor 刘松琴朱文静刘晓瑞
Owner SOUTHEAST UNIV
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