Sol-gel nanocomposite films as gas sensing and active optical materials
Assoc. Prof. Alessandro Martucci
The University of Padua, Italy
Wednesday 15th February 2006, 3.30PM, Seminar Room AR103, Graduate Research Centre.
Functional nanocomposite films have been obtained by doping sol-gel films with different functional nanoparticles. Highly luminescent
waveguides have been obtained by doping ZrO2-SiO2 hybrid organic-inorganic sol-gel films with semiconductor
quantum dots (CdSe, CdSe@CdS and CdSe@ZnS). Silver sensitised, erbium doped glass films have been synthesised using a combined
sol-gel and ion exchange route. These films displayed different Er3+ photoluminescence behaviour depending on silver
aggregation state. Nanoporous SiO2 films doped with NiO or Co3O4 nanocrystals showed both
optochemical and chemoresistive gas sensing properties. The nanoporosity of the sol-gel matrix provides a path for the gas
molecules to reach the functional ultrafine particles embedded in the glass matrix, whereas the reacting metal oxide nanoparticles
are responsible for the reversible change in resistance to different gases like H2, CO and humidity, as well as a
reversible change in the optical transmittance in the VIS-NIR range when exposed to CO.
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