Study on the optical band gap of partially protonated polyaniline/LaFeO3 microsphere nanocomposite
Paper ID : 1128-ICNS
seyedeh faezeh hashemi karouei *1, Hossain Milani Moghaddam2
1physics, Mazandaran University, Babolsar, Iran
2Department of Solid State Physics, University of Mazandaran, Babolsar
In the present study, partially protonated polyaniline (Pani)/LaFeO3 (LFO) microsphere nanocomposites were successfully synthesized through in-situ chemical oxidative polymerization using ammonium persulphate as an oxidizing agent. Three different weight percentage of LFO (5, 10 and 15%) were used in Pani matrix to prepare nanocomposites. The resulting nanocomposite materials were characterized by X-ray diffraction (XRD), UV-Visible spectroscopy (UV-Vis), Fourier transform infrared (FTIR) and Field emission-scanning electron microscopy (FE-SEM). The results showed good crystallinity of LFO microspheres, whereas nanocomposites were amorphous. According to the FE-SEM analysis, LFO microspheres were dispersed randomly in the Pani matrix and completely covered by Pani nanoparticles. The particle size of the nanocomposites estimated 33-40 nm. The optical band gap determined from UV-vis absorption spectra and calculated with the Tauc model. All samples were partially protonated. The optical band gap was increased from 1.12 eV in Pani to 2.48 eV in 10 wt% of LaFeO3 in Pani matrix, respectively.
Optical band gap; Partially protonated polyaniline; LaFeO3 microsphere.
Status : Abstract Accepted (Poster Presentation)