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This paper presents the fabrication and characterization of a flexible gas sensor based on TiO 2 nanotubes membrane, onto which array interdigitated gold electrodes in one side and a common heater in the backside were obtained using conventional microfabrication techniques. This was used to detect hydrogen sulphide within a concentration range of 6-38 ppm. The response to low concentrations of H 2 S at low temperature and good stability make the sensor a promising candidate for practical applications. These results support the proposal that the TiO 2 nanotubes membrane flexible sensors are promising in portable on-site detection based on low cost nanomaterials.