ISOBUTANE GAS-SENSING CHARACTERISTICS OF ZINC-TIN COMPLEX OXIDE SYSTEM

Bulk gas sensors composed of various atomic ratios of ZnO and SnO2 wer e fabricated and their gas sensing characteristics were investigated, After powder mixtures of ZnO and SnO2 together with equal weights of c amphor were pressed into disks, they were sintered at 1200 degrees C f or 3 h in air. The relationship between the atomic ratio of ZnO and Sn O2 and the gas sensing characteristics was investigated, As a result o f the measurements of the conductance of these gas sensors upon exposu re to 2vol% i-C4H10 gas, the sensor consisting of Zn : Sn = 0.68 : 0.3 2 was found to have the highest sensitivity. After the atmosphere was changed from i-C4H10 to air, the conductance returned to almost the in itial level within 1 min.