H2S-sensitive thin film fabricated from hydrothermally synthesized SnO2 sol

Abstract

A porous thin film of SnO₂ prepared on an alumina substrate by using hydrothermally synthesized SnO₂ sol shows excellent sensitivity to dilute H₂S in air together with good response transient characteristics when calcined at 700 °C. The pore size of the film increases uniformly with calcination temperature, and this well developed porous structure appears to be responsible for the excellent H₂S sensing characteristics.