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Since Zwilling and co-workers first introduced the electrochemical anodization method to prepare TiO 2  nanotubes in 1999, it has attracted a lot of researches due to its outstanding gas response and selectivity, making it widely used in gas detection field. This review presents an introduction to the sensor applications of TiO 2  nanotube arrays (TNTAs) in sulfur hexafluoride (SF 6 )-insulated equipment, which is used to evaluate and diagnose the insulation status of SF 6 -insulated equipment by detecting their typical decomposition products of SF 6 : sulfur dioxide (SO 2 ), thionyl fluoride (SOF 2 ), and sulfuryl fluoride (SO 2 F 2 ). The synthesis and sensing properties of TiO 2  nanotubes are discussed first. Then, it is followed by discussing the theoretical sensing to the typical SF 6  decomposition products, SO 2 , SOF 2 , and SO 2 F 2 , which analyzes the sensing mechanism at the molecular level. Finally, the gas response of pure and modified TiO 2  nanotubes sensor to SO 2 , SOF 2 , and SO 2 F 2  is provided according to the change of resistance in experimental observation.

Preparation and Application of TiO2 Nanotube Array Gas Sensor for SF6-Insulated Equipment Detection: a Review