Porous nickel ferrite for semiconducting gas sensor

Abstract

The sensitivity to some reducing gases (acetone, ethanol, methane and liquefied petroleum gas-LPG) of doped nickel ferrite, Ni0.99Co 0.01 MnxFe2-xO4-δ (x ≤ 0.01 and 0.02), was investigated. Starting from nitrates, as raw materials, the samples were prepared by selfcombustion method. The investigations of the samples were carried out by X-ray diffraction, scanning electron microscopy and gas sensitivity measurements of the electrical resistivity. The gas sensitivity largely depends on the composition, temperature and the test gas species. Especially, the mixed ferrite with Ni0.99Co0.01 Mn 0.02Fe1.98O4-δ composition is sensitive and selective for the detection of acetone gas. © 2005 IOP Publishing Ltd.