Pt:SnO2 thin films for gas sensor characterized by atomic force microscopy and x-ray photoemission spectromicroscopy

SnO2 thin films have been grown by radio frequency reactive sputtering method in order to be used as a gas sensor. Subsequently Pt has been added to the SnO2 films to increase the sensitivity to carbon monoxide gas. Two different substrates have been used: rough and mechanically polished alumina. The morphology of the film has been characterized by atomic force microscopy, whereas the chemical composition was analyzed by x-ray photoemission spectromicroscopy. Pt:SnO2 clusters with widths of 500-600 nm were observed on the rough alumina, whereas on the mechanically polished alumina, the Pt:SnO2 film was smoother. X-ray photoemission spectromicroscopy measurements show for Pt:SnO2 films on rough alumina substrates different charging in different areas of the sample. The response curve to carbon monoxide is 30% higher for rough alumina. (C) 1996 American Vacuum Society.

Published in:
Journal of Vacuum Science & Technology B, 14, 2, 1527-1530
Ist studio nuovi mat elettron,i-73100 lecce,italy. univ lecce,dipartimento sci mat,i-73100 lecce,italy. ecole polytech fed lausanne,inst phys appl,ch-1015 lausanne,switzerland. Cricenti, A, CNR,IST STRUTTURA MAT,VIA E FERMI 38,I-00044 FRASCATI,ITALY.
ISI Document Delivery No.: UH890

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