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Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array

A nanotube array and titanium dioxide technology, applied in the direction of material resistance, etc., can solve the problem of high power consumption, achieve the effect of reducing power consumption and improving portability

Inactive Publication Date: 2011-05-18
DALIAN UNIV OF TECH
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  • Application Information

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Problems solved by technology

Aiming at the problem of high power consumption of conventional metal oxide semiconductor formaldehyde sensors, the present invention utilizes the excellent physical and chemical properties of titanium dioxide nanotubes to develop a formaldehyde sensor that works at room temperature. Good selectivity for interfering gases such as ethanol and ammonia

Method used

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  • Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array
  • Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array
  • Room temperature formaldehyde gas sensor based on titanium dioxide nanotube array

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Embodiment Construction

[0011] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0012] TiO2 nanotube arrays were grown on metallic titanium substrates by electrochemical anodization. The experiment prepared an industrially pure titanium titanium metal substrate with a purity of 99.4%, and used abrasives to make it into a metal mirror material. Then it was polished, degreased with acetone, ultrasonically broken and cleaned with absolute ethanol, and deionized water for 10 minutes each time to remove grease, and dried in air at room temperature for later use in experiments. Before the anodizing experiment, the titanium surface was chemically treated with a mixed solution of sodium hydroxide (0.06 mol / L) and hydrogen peroxide (15 wt%). The anodic oxidation experiment was carried out in a cylindrical electrochemical reactor, using a two-electrode system, the power supply was a constant voltage DC ...

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Abstract

The invention discloses a room temperature formaldehyde gas sensor based on a titanium dioxide nanotube array, belonging to the technical field of electron gas sensitive devices. The room temperature formaldehyde gas sensor is characterized in that the titanium dioxide nanotube array is used as a sensitive element, two parallel metal electrodes are made on the titanium dioxide nanotube array; the working temperature of the sensor is between 15 DEG C and 30 DEG C, the relative humidity range of the working environment is 30-90 percent; and a sensor signal is used for measuring the change of a resistance value of the titanium dioxide nanotube array in an air atmosphere and a formaldehyde gas atmosphere using air as a background. The invention has the advantages of realizing that the content of trace formaldehyde gas in other two interference gases at room temperature is detected by using the titanium dioxide nanotube array with high specific surface area, greatly reducing the power consumption of the sensor during the use, and improving the convenience of using the sensor.

Description

technical field [0001] The invention belongs to the technical field of electronic gas sensitive devices, and relates to a formaldehyde gas sensor at room temperature based on titanium dioxide nanotube arrays. Background technique [0002] Formaldehyde is an organic volatile compound that is very harmful to human health. Therefore, it has always been a demand in the sensor field to develop a cheap and portable formaldehyde gas sensor. Conventional metal-oxide-semiconductor-based sensitive materials such as SnO 2 , WO 3 , LaFe 1-x Zn x o 3 , NiO, CdO-In 2 o 3 and ZnO formaldehyde sensor exhibited good sensing performance. However, the operating temperature of the sensor is required to be above 200°C, which greatly increases the demand for power consumption, which is extremely unfavorable for the portable use of the sensor. TiO nanotubes have attracted increasing attention in recent years due to their high specific surface area, high aspect ratio, and size-dependent eff...

Claims

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Application Information

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IPC IPC(8): G01N27/12
Inventor 李晓干吴健李春燕余隽唐祯安王兢闫卫平黄正兴孙芳洁
Owner DALIAN UNIV OF TECH
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