ZnO:Sb based screen printed thick-film H-2, CO and CH4 gas sensors wer
e fabricated. Films were realized on an alumina substrate by mixing Zn
O with lead borosilicate glass frits as a binder and Sb as a catalyst.
It was observed that the ZnO:Sb based sensors were more sensitive to
these gases than the pure ZnO sensors. The conductance of the sensor i
ncreased linearly with the square root of the gas concentration. The d
ependence of the sensitivity on the amount of the additive (Sb) is dis
cussed. The sensors have a response time of 10 a. Material characteriz
ation was carried out by using bulk X-ray diffraction (XRD) and surfac
e morphology by scanning electron microscopy (SEM). (C) 1998 Elsevier
Science S.A. All rights reserved.