TiO2 Nanotube Array Sensor for Detecting the SF6 Decomposition Product SO2

Abstract

The detection of partial discharge through analysis of SF6 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 TiO2 nanotube array sensor for detecting the SF6 decomposition product SO2, and the application of the anodic oxidation method for the directional growth of highly ordered TiO2 nanotube arrays. The sensor response of 10–50 ppm SO2 gas is tested, and the sensitive response mechanism is discussed. The test results show that the TiO2 nanotube sensor array has good response to SO2 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.

Adsorptions of SO2, SOF2, and SO2F2 on Pt-modified anatase (101) surface: Sensing mechanism study

“…Results of preliminary gas-sensing experiments show that intrinsic TNTA and Pt-modified TNTA can be used to detect different concentrations of SO 2 , SOF 2 , and SO 2 F 2 under certain conditions. Intrinsic TNTA is suitable for detecting SO 2 (response: SO 2 > SOF 2 > SO 2 F 2 ), whereas Pt-modified TNTA is suitable for detecting SO 2 F 2 (response: SO 2 F 2 > SO 2 ≈ SOF 2 ) [9,10].…”

Comparative Study of Materials to SF6 Decomposition Components

“…To detect, evaluate, and diagnose the insulation status of SF 6 gas insulated equipment using the characteristics of SF 6 decomposition, a series of characteristic SF 6 decomposition components, SOF 2 , SO 2 F 2 , SO 2 , H 2 S, CF 4 , HF, and SF 6 , are detected by gas sensors, including metal functionalized single wall carbon nanotubes (SWCNTs) [1][2][3][4][5][6], TiO 2 nanotubes [7][8][9], and graphene gas sensors [10,11], as shown in Table 1. According to the theoretical calculation results, these three kinds of gas-sensing materials are not sensitive to the background gas SF 6 and decomposition component CF 4 .…”

Adsorption Mechanism of Typical Gases Exhaled by Lung Cancer Patients on the Anatase TiO2(101) Surface

“…The double numerical basis set plus polarization (DNP) functions were also adopted [16]. Energy convergence was set as 1.0 × 10 −5 Ha, with energy gradient and atom displacement as 0.002 Ha/Å and 0.005 Å, respectively.…”

“…The gas-sensing performances of such sensors can be enhanced by metal and nonmetal doping and, at the same time, realize the selective detection towards the components and contents of mixed gases [7][8][9][10][11]. In recent years, researches of TNTA gas sensors focus on the detection of some common gases such as CO, H 2 , O 2 , NH 3 , NO 2 , acetone, and ethanol [12][13][14][15][16][17], while, to the best of our knowledge, there are few reports about the application of TNTAs for the prognosis of lung cancer through the detection of some VOCs.…”