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H2S gas sensitive sensor and preparation method of Co-doped TiO2 nano-tube array films

A technology of nanotube array and gas sensor, which is applied in the field of electronic gas sensor, which can solve the problems of device difficulty and limit the application of sensors, and achieve the effects of short response/recovery time, simple preparation process, and improved gas sensor performance

Active Publication Date: 2017-05-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] with ordinary nano-TiO 2 material compared to TiO 2 The nanotube array has a larger specific surface area and stronger adsorption capacity, so it should have a higher gas sensitivity response capability, but it is difficult to device, which limits the application of this type of sensor

Method used

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Experimental program
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Effect test

Embodiment 1

[0037] The preparation of embodiment 1 sensor

[0038] The titanium foil (0.01 mm) was ultrasonically cleaned in acetone, ethanol, and deionized water for 10 min in order to remove the oil on the surface of the titanium foil, and finally dried naturally for later use. The pretreated titanium foil was connected to the positive electrode of the power supply, and the platinum electrode was connected to the negative electrode, and the distance between the two electrodes was 2.5 cm. Place the two poles in the electrolyte, which contains 0.55 wt% NH 4 An ethylene glycol solution of F and 20 wt% deionized water was anodized at 30 V for 2 h at room temperature.

[0039] After the anodic oxidation, cobalt chloride was added to the electrolyte to make the concentration 0.05 M, and the nanotube array was soaked for 1 h. After the reaction, the prepared sample was washed with deionized water, dried naturally and placed in a horse. In the Furnace, in the air atmosphere, the temperature w...

Embodiment 2

[0042] The preparation of embodiment 2 sensor

[0043] The titanium foil (0.01 mm) was ultrasonically cleaned in acetone, ethanol, and deionized water for 10 min in order to remove the oil on the surface of the titanium foil, and finally dried naturally for later use. The pretreated titanium foil was connected to the positive electrode of the power supply, and the platinum electrode was connected to the negative electrode, and the distance between the two electrodes was 2.5 cm. Place the two poles in the electrolyte, which contains 0.55 wt% NH 4 An ethylene glycol solution of F and 20 wt% deionized water was anodized at 30 V for 2 h at room temperature.

[0044] After the anodic oxidation, cobalt chloride was added to the electrolyte to make the concentration 0.1 M, and the nanotube array was soaked for 2 h. After the reaction, the prepared sample was washed with deionized water, dried naturally and placed in a horse. In the Furnace, in the air atmosphere, the temperature wa...

Embodiment 3

[0047] The preparation of embodiment 3 sensor

[0048] The titanium foil (0.01 mm) was ultrasonically cleaned in acetone, ethanol, and deionized water for 10 min in order to remove the oil on the surface of the titanium foil, and finally dried naturally for later use. The pretreated titanium foil was connected to the positive electrode of the power supply, and the platinum electrode was connected to the negative electrode, and the distance between the two electrodes was 2.5 cm. Place the two poles in the electrolyte, which contains 0.55 wt% NH 4 An ethylene glycol solution of F and 20 wt% deionized water was anodized at 30 V for 2 h at room temperature.

[0049] After the anodic oxidation, cobalt chloride was added to the electrolyte to make the concentration 0.1 M, and the nanotube array was soaked for 3 h. After the reaction, the prepared sample was washed with deionized water, dried naturally and placed in a horse. In the Furnace, in the air atmosphere, the temperature wa...

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Abstract

The invention discloses a H2S gas sensitive sensor and a preparation method of Co-doped TiO2 nano-tube array films, and belongs to the technical field of electronic gas sensitive devices. According to the preparation method, TiO2 nano-tube arrays are prepared by the aid of an anodic oxidation method, transition metal is doped into the TiO2 nano-tube arrays, secondary treating of the TiO2 nano-tube arrays is omitted, complete transparent TiO2 nano-tube array films can be obtained, and the nano gas sensitive sensor is prepared by the aid of the array films and has good sensitivity and selectivity for hydrogen sulfide gas. The method is simple in preparation process, the prepared sensor has high selectivity and short response / recovery time for the hydrogen sulfide gas, and device of the gas sensitive sensor is achieved and has market development prospect.

Description

technical field [0001] The invention belongs to the technical field of electronic gas sensors, and in particular relates to a Co-doped TiO 2 Nanotube Array Film H 2 S gas sensor and its preparation method. Background technique [0002] As we all know, hydrogen sulfide is a poisonous gas with the smell of rotten eggs, which can affect the human nervous system and can be fatal when the concentration reaches 250 ppm. Therefore, it is very important to develop a gas sensor with fast response and high sensitivity to hydrogen sulfide gas. According to the principle of response, gas sensors are mainly divided into semiconductor gas sensors, contact combustion gas sensors and electrochemical gas sensors, among which semiconductor gas sensors have the most extensive application range. [0003] Semiconducting metal oxides are one of the main materials for the preparation of hydrogen sulfide gas sensors. In recent years, In 2 o 3 , ZnO, SnO 2 and Co 3 o 4 Metal oxide materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/12
CPCG01N27/125
Inventor 沈文浩童欣陈小泉
Owner SOUTH CHINA UNIV OF TECH
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