NITROGEN-OXIDES SENSING CHARACTERISTICS OF ZN2SNO4 THIN-FILM

A thin film of Sb-doped Zn2SnO4 with spinel-type structure was deposit ed on an alumina substrate by sputtering from multi-targets of constit uent metals, followed by annealing at 1000 degrees C in air for 1 h. T he film showed fairly good sensing characteristics to nitrogen dioxide over the range from 0 to 300 ppm at 600 degrees C, though the interfe rence by nitrogen monoxide and iso-butane was rather large. The durabi lity of the film in a reductive atmosphere at 600 degrees C was proved . The electrical resistance of the film was found to respond well to t he total concentration of nitrogen oxides in an engine exhaust. (C) 19 98 Elsevier Science S.A. All rights reserved.