INVESTIGATION ON STRUCTURAL, MORPHOLOGICAL, THERMAL AND OPTICAL PROPERTIES OF BLEND PPY- PVA THIN FILMS DOPED WITH NANO TiO2 PARTICLES

Abstract

Poly Vinyl Alcohol (PVA), Poly Pyrrole (PPY), and PPY-PVA blend thin films loaded with varying concentrations of nano TiO2 particles were prepared by using the in-situ chemical oxidative polymerization technique. Prepared films have undergone several characterization techniques i.e., XRD, UV- Spectroscopy, SEM, and DSC to study their structural, morphological, optical, and thermal properties. SEM images revealed that the surface morphology of PPY has been significantly modified upon the addition of PVA and nano TiO2 particles and observed the presence of pores on the surface. XRD spectra disclose that the amorphous nature of PPY whereas semi-crystalline nature of PVA and the amorphous nature of PPY-PVA blend thin film, also revealed that the concentration of dopant imparts the crystallinity to the nanocomposite thin films. The DSC thermographs confirmed that the shifting of melting temperature towards the higher temperature side in PPY-PVA blend thin film compared to pure PPY and PVA and the addition of dopant has changed melting points towards slightly lower temperature side. Direct band gap values of prepared thin films have been calculated by plotting UV graphs, and these were diminished as rising in the concentration of dopant which supports the conductivity level of thin films.

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

“…In PPY-PVA-nano TiO 2 films, dopant particles get distributed throughout PPY-PVA matrix effectivly compared to fine particles which might be due to their large surface area to z E-mail: trameshreddy31@gmail.com ECS Journal of Solid State Science and Technology, 2024 13 033007 volume ratio of nano TiO 2 particles. 25,26 XRD spectra of PPY-PVAnano TiO 2 established that peaks have been broadened and having less intense compared to PPY-PVA-fine TiO 2 films which might be due to modification in interplanar spacing. 24,[30][31][32] Dielectric studies.-Thin films of PPY-PVA doped with different concentrations of TiO 2 fine particles have been investigated by Impedence spectroscopy in frequency range 100 Hz-5 MHz at room temperature and plotted graph between frequency verses Dielectric constant and frequency verses Dielectric loss depicted (Figs.…”

“…Finally, a black coloured PPY-PVA-TiO 2 thin film was obtained after evaporating excess water. 25,26 PPY-PVA-TiO 2 thin films were prepared by varying concentrations of TiO 2 fine particles like 2%, 3% and 4% using same procedure. Another set of PPY-PVA-TiO 2 thin films have been prepared by varying concentrations of nano TiO 2 particles (like 1%, 2%, 3% and 4% of TiO 2 ) by the same procedure.…”