The effect of different SnO2 loading (0-25 wt.%) on the microstructural, electrical and gas sensing properties of ITO (indium tin oxide) nanocrystals synthesized by a non-aqueous sol-gel technique was evaluated. TEM, HRTEM and XRD characterization has shown that all samples have a uniform grain morphology and narrow particle size distribution, while a remarkable size reduction was observed with the increase of tin loading in the mixed oxide formulation. Redox properties of the samples were also characterized by H2-TPR. The gas sensing properties of ITO films towards CO (100-1000 ppm) and ethanol (50-400 ppm) have been investigated. On the basis of the characterization data, explanations of the observed sensing behaviour of ITO films are given
A study on the microstructure and gas sensing properties of ITO nanocrystals
NERI, Giovanni;BONAVITA, ANNA;MICALI, GIUSEPPE;RIZZO, Giuseppe;
2007-01-01
Abstract
The effect of different SnO2 loading (0-25 wt.%) on the microstructural, electrical and gas sensing properties of ITO (indium tin oxide) nanocrystals synthesized by a non-aqueous sol-gel technique was evaluated. TEM, HRTEM and XRD characterization has shown that all samples have a uniform grain morphology and narrow particle size distribution, while a remarkable size reduction was observed with the increase of tin loading in the mixed oxide formulation. Redox properties of the samples were also characterized by H2-TPR. The gas sensing properties of ITO films towards CO (100-1000 ppm) and ethanol (50-400 ppm) have been investigated. On the basis of the characterization data, explanations of the observed sensing behaviour of ITO films are givenPubblicazioni consigliate
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