Design and development of SnO decorated BaTiO3 heterostructure device platform for ethanol vapor detection

Herein, we reported the SnO decorated BaTiO₃ heterostructure as well as pristine BaTiO₃ based ethanol gas sensing properties examined. Barium titanate (BaTiO₃) and tin oxide (SnO) materials have been successfully synthesized by the hydrothermal alkaline solution technique. Structural investigations carried out by X-ray diffraction (XRD) analysis suggested the cubic phase of BaTiO₃ and the tetragonal SnO phase of the materials. Transmission electron microscopy (TEM) suggested irregular nanospheres of BaTiO₃ and micro sheets of SnO. The macroporous nature of BaTiO₃ and mesoporous nature of SnO were confirmed through Brunauer–Emmett–Teller (BET) analysis.   The fabricated device of BaTiO₃/SnO heterostructure shows sensor response of 10% with the fast response/recovery time of 1.9/1.6 s at the operating temperature of 150 °C for 500 ppm of ethanol vapor. The highest performance for the BaTiO₃/SnO heterostructure device was found to be sensor performance of 343% for 500 ppm of ethanol vapor with fast response time of 2.4 s at the operating temperature of 250 °C and it shows excellent sensor response at higher temperature.