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Investigation of Gas Sensing Characteristics of TiO2 Nanotube Field-Effect Transistor

Hydrothermal TiO2 nanotubes are focused on as a functional material owing to their large surface-to-bulk ratio. We have revealed that the electric conduction of a TiO2 nanotube field-effect transistor (FET) is dominated by a double Schottky barrier formed between the TiO2 nanotubes. In this study, the gas sensing characteristics of the FET for ethanol at room temperature were investigated. The decrease of the drain current was observed in atmosphere with an ethanol concentration of 30 ppm. From the detailed analysis of the barrier height and the threshold voltage using the model of a double Schottky barrier, it was found that the barrier decreases and the carrier densities decrease through the adsorption of ethanol, which works as an electron acceptor.