https://doi.org/10.1140/epjb/e2005-00255-7
Charge transport mechanism of vanadium pentoxide xerogel-polyaniline nanocomposite
Department of Materials Science,
Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
Corresponding author: a msskd@mahendra.iacs.res.in
Received:
9
September
2004
Revised:
25
May
2005
Published online:
18
August
2005
The nanocomposites of conducting polyaniline are prepared by intercalating into the layers of vanadium pentoxide (V2O5) xerogel. The intercalation is confirmed by the observation of lattice expansion of V2O5 xerogel. Dc conductivity of the gel follows Arrhenius type temperature dependence while the nanocomposites exhibit three dimensional variable range hopping. The ac conductivity and dielectric properties are extensively studied at low temperature up to the frequency of 10 MHz. Two semicircles in Cole-Cole plot of impedance are found for the nanocomposites. The ac conductivity spectra reveal three frequency regions. The frequency exponent in the lower frequency region is nearer to 2. The dielectric response exhibit broad spectra which are analyzed by Cole-Cole distribution function. The peak frequency of dielectric spectra appears at the first cross over frequency of conductivity spectra.
PACS: 71.20.Tx – Fullerenes and related materials; intercalation compounds / 73.63.-b – Electronic transport in nanoscale materials and structures / 72.80.Le – Polymers; organic compounds (including organic semiconductors) / 77.22.Gm – Dielectric loss and relaxation
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
