Preparation of H2 and LPG gas sensor

Abstract Among the various metal oxide additives tested, Ag 2 O is outstanding in promoting the sensing properties of γ-Fe 2 O 3 element to H 2 in air. The γ-Fe 2 O 3 element loaded with 6 wt.% Ag 2 O is very sensitive to H 2 at 320 °C, while it is also sensitive to many other gases, especially C 2 H 5 OH. The element is highly sensitive and selective to H 2 and LPG, after it is modified with the surface-coat of Al 2 O 3 containing 1.5 wt.% PtO. The response of this element to H 2 and C 4 H 10 is rather rapid (only 4 and 6 s, respectively), and its resistance only changes 8.9% even when the ambient relative humidity varies broadly (from 10 to 98%). So the element is very useful to detect the leakage of coal gas or LPG in domestic appliances.