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TiO2 nanotube array sensor for detecting the SF6 decomposition product SO2.

Zhang X, Zhang J, Jia Y, Xiao P, Tang J - Sensors (Basel) (2012)

Bottom Line: The detection of partial discharge through analysis of SF(6) gas components in gas-insulated switchgear, is significant for the diagnosis and assessment of the operating state of power equipment.The present study proposes the use of a TiO(2) nanotube array sensor for detecting the SF(6) decomposition product SO(2), and the application of the anodic oxidation method for the directional growth of highly ordered TiO(2) nanotube arrays.The sensor response of 10-50 ppm SO(2) gas is tested, and the sensitive response mechanism is discussed.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China. zhxx@cqu.edu.cn

ABSTRACT
The detection of partial discharge through analysis of SF(6) gas components in gas-insulated switchgear, is significant for the diagnosis and assessment of the operating state of power equipment. The present study proposes the use of a TiO(2) nanotube array sensor for detecting the SF(6) decomposition product SO(2), and the application of the anodic oxidation method for the directional growth of highly ordered TiO(2) nanotube arrays. The sensor response of 10-50 ppm SO(2) gas is tested, and the sensitive response mechanism is discussed. The test results show that the TiO(2) nanotube sensor array has good response to SO(2) gas, and by ultraviolet radiation, the sensor can remove attached components very efficiently, shorten recovery time, reduce chemical poisoning, and prolong the life of the components.

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TiO2 nanotube array sensor stability testing curve.
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f10-sensors-12-03302: TiO2 nanotube array sensor stability testing curve.

Mentions: According to the experimental method and process in Section 2.3, when the temperature was at 200 °C, the sensor stability test towards the SF6 decomposition component SO2 was conducted. The test results are shown in Figure 10. Before the sensor stability test, the TiO2 nanotube array sensor resistance remained basically unchanged when flowing pure N2 was injected. When injected with 50 ppm SO2 gas, the sensor resistance changed dramatically and achieved stability immediately. When injected with N2 after a certain period, the sensor resistance gradually returned to the initial value. The above experiment was tested three times, and we found that the sensor response of SO2 gas is invariable, and every time through nitrogen cleaning, the resistance of sensor can be returned to the initial value. Thus it is shown that the sensor has good stability. The sensor was tested agian after two months, when we repeated the 50 ppm SO2 gas experiment once again, and found that the sensor response falls, and resistance can’t return to the initial value, showing that the sensor has experienced chemical poisoning. Ultraviolet light is used for illumination and quick reduction of the resistance of the sensor. When stability is achieved, the resistance becomes smaller than the initial one. By passing nitrogen gas again, the sensor resistance increases gradually, and finally achieves stability. The sensor resistance returns to the initial value; when we performed the 50 ppm SO2 gas experiment two times, the sensor response reaches the level of the two months ago. That is, through the ultraviolet irradiation, the SO2 gas molecules adsorbed on the sensor can be washed away completely. Therefore, the TiO2 nanotube array achieves complete desorption results.


TiO2 nanotube array sensor for detecting the SF6 decomposition product SO2.

Zhang X, Zhang J, Jia Y, Xiao P, Tang J - Sensors (Basel) (2012)

TiO2 nanotube array sensor stability testing curve.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3376569&req=5

f10-sensors-12-03302: TiO2 nanotube array sensor stability testing curve.
Mentions: According to the experimental method and process in Section 2.3, when the temperature was at 200 °C, the sensor stability test towards the SF6 decomposition component SO2 was conducted. The test results are shown in Figure 10. Before the sensor stability test, the TiO2 nanotube array sensor resistance remained basically unchanged when flowing pure N2 was injected. When injected with 50 ppm SO2 gas, the sensor resistance changed dramatically and achieved stability immediately. When injected with N2 after a certain period, the sensor resistance gradually returned to the initial value. The above experiment was tested three times, and we found that the sensor response of SO2 gas is invariable, and every time through nitrogen cleaning, the resistance of sensor can be returned to the initial value. Thus it is shown that the sensor has good stability. The sensor was tested agian after two months, when we repeated the 50 ppm SO2 gas experiment once again, and found that the sensor response falls, and resistance can’t return to the initial value, showing that the sensor has experienced chemical poisoning. Ultraviolet light is used for illumination and quick reduction of the resistance of the sensor. When stability is achieved, the resistance becomes smaller than the initial one. By passing nitrogen gas again, the sensor resistance increases gradually, and finally achieves stability. The sensor resistance returns to the initial value; when we performed the 50 ppm SO2 gas experiment two times, the sensor response reaches the level of the two months ago. That is, through the ultraviolet irradiation, the SO2 gas molecules adsorbed on the sensor can be washed away completely. Therefore, the TiO2 nanotube array achieves complete desorption results.

Bottom Line: The detection of partial discharge through analysis of SF(6) gas components in gas-insulated switchgear, is significant for the diagnosis and assessment of the operating state of power equipment.The present study proposes the use of a TiO(2) nanotube array sensor for detecting the SF(6) decomposition product SO(2), and the application of the anodic oxidation method for the directional growth of highly ordered TiO(2) nanotube arrays.The sensor response of 10-50 ppm SO(2) gas is tested, and the sensitive response mechanism is discussed.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China. zhxx@cqu.edu.cn

ABSTRACT
The detection of partial discharge through analysis of SF(6) gas components in gas-insulated switchgear, is significant for the diagnosis and assessment of the operating state of power equipment. The present study proposes the use of a TiO(2) nanotube array sensor for detecting the SF(6) decomposition product SO(2), and the application of the anodic oxidation method for the directional growth of highly ordered TiO(2) nanotube arrays. The sensor response of 10-50 ppm SO(2) gas is tested, and the sensitive response mechanism is discussed. The test results show that the TiO(2) nanotube sensor array has good response to SO(2) gas, and by ultraviolet radiation, the sensor can remove attached components very efficiently, shorten recovery time, reduce chemical poisoning, and prolong the life of the components.

Show MeSH
Related in: MedlinePlus