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

Author:

T Ramesh ReddyORCID,Subrahmanyam A. R.,Ravindar Reddy M.,Siva Kumar J.,Jaipal Reddy M.,Venkata Ramana K.

Abstract

An In situ oxidative chemical polymerization technique was used to prepare thin films of PPY, PVA, and PPY-PVA blend doped with variable concentrations of TiO2 fine- and nano-particles further investigated by X-ray diffractometer (XRD) and impedance spectrometer to study structural, dielectric, and AC conducting behavior. XRD spectra established that sharp and high intense peaks of PPY-PVA- fine TiO2 films indicated more crystallinity, which might be due to higher compactness and modification in interplanar spacing. Dielectric plots revealed that PPY-PVA-nano TiO2 films exhibited higher dielectric constants and lower dielectric loss compared to films of PPY-PVA- fine TiO2 in shorter frequency region, suggesting that these films are more suitable for charge storage devices. Conductivity plots revealed that AC conductivity of pure PPY was low (4.8 × 10−3 S cm−1 at 313 0 K) and was increased to 5.3 × 10−3 S cm−1 by addition of PVA. AC conductivities of PPY-PVA-nano TiO2 thin films are relatively higher (7.43 × 10−3 S cm−1 to 1.14 × 10−2 S cm−1) than PPY-PVA-fine TiO2 films (6.35 × 10−3 to 9.78 × 10−3 S cm−1) with increasing frequency and temperature, which could be due to large surface area to volume ratio of nano-size dopant. This suggests that PPY-PVA-nano TiO2 thin films may be used for sensing various gasses.

Publisher

The Electrochemical Society

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