Gas Sensitivity and Sensing Mechanism Studies on Au-Doped TiO(2) Nanotube Arrays for Detecting SF(6) Decomposed Components

The analysis to SF(6) decomposed component gases is an efficient diagnostic approach to detect the partial discharge in gas-insulated switchgear (GIS) for the purpose of accessing the operating state of power equipment. This paper applied the Au-doped TiO(2) nanotube array sensor (Au-TiO(2) NTAs) to detect SF(6) decomposed components. The electrochemical constant potential method was adopted in the Au-TiO(2) NTAs' fabrication, and a series of experiments were conducted to test the characteristic SF(6) decomposed gases for a thorough investigation of sensing performances. The sensing characteristic curves of intrinsic and Au-doped TiO(2) NTAs were compared to study the mechanism of the gas sensing response. The results indicated that the doped Au could change the TiO(2) nanotube arrays' performances of gas sensing selectivity in SF(6) decomposed components, as well as reducing the working temperature of TiO(2) NTAs.