Synthesis, Characterization and H 2 S Gas Sensor Performance of Hydrothermal Prepared SnO 2 Films Nanostructures

• Published in: IOP conference series. Earth and environmental science 2021-06, Vol.790 (1), p.12085
• Main Authors: Shano, Ahmed M, Khudhur, Ahmed Mahmood, Hassan Abbas, Abdul Salam, Bakr, Nabeel A., Ali, Iftikhar M.
• Format: Article
• Language: English
• ISSN: 1755-1307; 1755-1315
• DOI: 10.1088/1755-1315/790/1/012085

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 SnO 2 films are polycrystalline in nature with tetragonal. The FESEM images of SnO 2 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 H 2 S toxic gas sensing properties of SnO 2 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.