SrTiO3-TiO2 heterostructured nanotubes array for selective acetone sensing

Efficient detection of acetone is essential for medical applications. In this context, we are reporting acetone selective SrTiO3-TiO2 sensor. Initially, TiO2 nanotube array was synthesized by the electrochemical anodization and then treated with Sr(OH)2 solution through the hydrothermal reaction. The morphology and crystallinity of the SrTiO3-TiO2 nanotubes were investigated. The Au/SrTiO3-TiO2/Ti sensor exhibited its natural selectivity towards acetone and showed a high response (99.5%/50 ppm) at 150°C under 80% relative humidity. The sensor exhibited a remarkable 51.2% response even for 0.5 ppm acetone. The stability and hydrophobicity of SrTiO3 result in consistency during repeated cycle study of the sensor.