Characterization of Multiphase Polypyrrole/Vanadium Oxide Nano Composites for a.c. Conductivity and Dielectric Properties

Abstract

Vanadium oxide: Phase-1 and Phase-2 nano powers were synthesized from vanadium pentoxide in the presence of glucose using hydrothermal technique. The polypyrrole/vanadium oxide (PV P-1 and PV P-2) nano composites were synthesized with 15, 30, 45 and 60 weight percents of vanadium oxide: Phase-1 and Phase-2 in pyrrole, by the chemical polymerization (oxidation) method. The SEM micrographs of vanadium oxide: Phase-1 and Phase-2 nano powders have shown mixture of nano belts & rods and PV P-1 & PV P-2 nano composites indicate that the composites have cluster formation with almost spherical nature particles and form elongated chains at some places. Conductivity versus frequency plots shown that exponential increase for conductivity. The value of s increases to 1.13x10-3 S/cm for 15 wt. % of VO2 P-1 in polypyrrole & to 2.43x10-3 S/cm for 30 wt. % of VO2 P-2 in polypyrrole at 1 MHz.

Comparative Study on Structural, Dielectric Behavior and AC Conductivity of PPY-PVA Incorporated with TiO2 Fine and Nano Particles

“…It was observed that Dielectric constants of PPY-PVA-fine TiO 2 composites are large at lower frequency region which could be due to polarization effect. 22,[33][34][35][36][37][38][39][40][41][42][43][44][45][46] The Dielectric plot revealed that Dielectric constants were decreased with increase in frequency and attained almost constant value which could be due to lack of charge response for applied frequency at higher frequency region (Maxwell-Wagner polarization). 42,43 Dielectric polt established that Dielectric constants have been increased with increase in concentration of TiO 2 fine particles this might be due to high density and existance of polron and bi-polaron states.…”