Characterization of nanosized TiO2 based H2S gas sensor

The present investigation deals with the fabrication of H₂S gas sensor based on semiconducting oxide,TiO₂. Among the various metal oxide additives tested, Al₂O₃ is outstanding in promoting the sensing properties of nanosized TiO₂ based H₂S gas sensor. XRD pattern of TiO₂ /Al₂O₃ shows complete phase formation with anatase structure and grain growth 45 nm. The TiO₂ sensor loaded with 5 wt% Al₂O₃ and 0.5 wt% Pd shows increase in sensitivity to H₂S. The cross sensitivity of 0.5 wt% Pd:5 wt% Al₂O₃ doped TiO₂ also checked for CO, LPG and H₂ gases. The highest sensitivity for low concentration of H₂S was observed using TiO₂ based mixed Al₂O₃ and Pd. The H₂S sensor shows high sensitivity and undesirable cross sensitivity effect using TiO₂/Al₂O₃/Pd as sensing materials.