The sensitive composite material was prepared by doping Pd and some metal o
xides such as MgO into SnO2-In2O3-TiO2 matrix material. The technique for f
abricating the direct-heating-type sensor and a surface-modifying process w
ere employed to prepare the CH, gas sensor. Its sensitive properties and wo
rking mechanism are presented. (C) 2000 Elsevier Science S.A. All rights re
served.