Synthesis, Characterization and H2S Gas Sensor Performance of Hydrothermal Prepared SnO2 Films Nanostructures

Abstract In this work, tin oxide thin films were successfully synthesized by hydrothermal method and depositing on silicon substrates by spin coating technique at room temperature with thickness of about 325±5 nm. The structural, surface morphological, optical and gas sensor properties have been investigated. The XRD results showed that SnO2 films are polycrystalline in nature with tetragonal. The FESEM images of SnO2 clearly indicate that the oxide possesses has like cauliflower like shapes. The optical properties show that the optical energy gap follows allowed direct electronic transition calculated using Tauc’s equation. The H2S toxic gas sensing properties of SnO2 thin film are examined as a function of time and operating temperature. High sensitivity (197%) was attained at operating temperature of 200 °C with fast response and recovery times.