| 摘要 |
PURPOSE:To improve humidity resistance with high sensitivity being maintained, by providing a catalyst layer, which comprises one or more insulating materials that are selected among Al2O3, SiO2, and ZrO2 including one or more noble metals selected from Pt, Pd, Rh, Ir, and Ru in addition to Ag, on the surface of a gas response body comprising a metal oxide semiconductor. CONSTITUTION:A catalyst material, wherein a specified amount of Al2O3 powder is added in the aqueous solution of palladium chloride and sufficiently mixed, and a catalyst material, wherein a specified amount of Al2O3 powder is added into the aqueous solution of silver nitrate and sufficiently mixed, are mixed. Said mixture is dried and then made to be powder. The powder is burned and a catalyst including Pd and Ag is prepared. Said catalyst is applied to the outer surface of a gas response body 3 and burned, a tubular catalyst layer 4 is formed, and an element body 5 is manufactured. Then the element body 5 is mounted on an insulating plate 7, through which 6 terminals 6... are pierced and supported. A heater coil 8 is inserted in an insulating pipe 2 of the body 5. Both ends of the coil are connected to two pieces of the terminals 6. Two lead wires 9... are connected to a pair of facing electrodes 11 (12) of the element body 5. The other ends of the lead wires are connected to the remaining terminals 6.... Thus a gas detecting element is assembled. |
