Superfluid to Mott Insulator Quantum Phase Transition in a Permanent
Dr Dario Buso
Centre for Micro-Photonics,
Swinburne University of Technology
Friday 7 March 2008, 3:30 pm, EN101
(Ground Floor, EN Building), Hawthorn.
The work presented is focused
on the application of the Sol-Gel technique in the realization of
thin inorganic layers containing metal and semiconductor nanoparticles
capable of reversibly detecting gas phase analytes. Three synthetic
approaches were adopted, each of them characterized by a systematic
increase of the final materials morphology, structure and micro-structure
In the first approach, named In-situ synthesis, the nanoparticles
growth has been promoted during formation of the porous matrix through
controlled annealing. The second approach, named Ex-situ synthesis,
comprised of the separate synthesis of the nanoparticles and subsequent
insertion inside the porous support. The third protocol consisted
in creating monolayers of nanoparticles on the surface of a substrate,
followed by coating with the desired sol-gel matrix.
The layers have then been tested as gas sensors exploiting different
interfaces: optical, conductometric and surface acoustic wave. In
all cases a reversible detection of the target gaseous species has
been observed, and it has been possible to correlate the materials
structure / micro-structure to the respective gas sensing performance.
The materials engineering was essential in order for nanocomposites
with the desired optical and chemical properties applicable to gas
sensing devices to be obtained.
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