INFLUENCE OF MODE OF SYNTHESIS ON THE SENSING PROPERTIES OF PD-POLYANILINE NANOCOMPOSITE TOWARDS METHANOL VAPOURS
Published: 2008
Author(s) Name: Anjali A. Athawale, Prachi P. Katre and S.V. Bhagwat
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Abstract
Pd-polyaniline nanocomposites are found to be highly selective sensors for the methanol vapours. The response
is found to be rapid and reversible. However, the mode of synthesis is observed to affect the magnitude of
response as well as response time. The nanocomposites were synthesized by a two step method involving the
formation of Pd nanoparticles followed by the polymerization of nanosol to obtain the nanocomposite. Pd
nanoparticles were prepared by two different methods namely thermal reduction (reflux) and g radiolysis. The
selectivity of the nanocomposites was investigated by exposing them to mixtures of methanol-ethanol and
methanol – isopropanol. The two composites were found to exhibit exactly identical response as that for pure
methanol except that the response time is much longer. The mechanism of sensing has been explained on
the basis of FT-IR spectroscopy.
Key words: Palladium-polyaniline nanocomposites, thermal reduction, r-radiolysis
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