Spectroscopic analysis of Pure and Ferrocene Doped Polysulfone using X-Ray Diffraction , UV- Visible and FT-IR Techniques

Abstract

    In the present study the improvement in dielectric and electrical properties of polysulfone, due to doping of ferrocene was studied. For the study of structural and optical characterization of  pure and ferrocene doped foil samples of polysulfone, the  spectroscopic analysis techniques like X-Ray diffraction, FT-IR and UV- Visible techniques were used in the present study. The samples of pure and ferrocene doped polysulfone in the form of foil were prepared by isothermal immersion technique. The sensitization of ferrocene was carried out by mixing the 10 mg, 50 mg and 100 mg of ferrocene with 4 gm of pure polysulfone..  The FT-IR characterization study indicates the development of an additional absorption peak at 1407 cm-1 due to doping with ferrocene, whereas other peaks of pure polysulfone remain apparent in doped samples also, but  with broadening and gradually reduction in transmittance with the increase of  doping ratio.  The optical band gap was calculated by UV-visible spectroscopy. In case of UV spectra, out of two absorption regions present in undoped sample, one band merge and only one sharp absorbance peak appears in sensitized samples. It is identified that the UV absorption increases, while band gap decreases with increase in the dopant concentration. The XRD diffractograms of pure and doped samples consists of both sharp and diffused peaks and corresponds to crystalline and amorphous regions respectively. The XRD study confirms structural modification of polysulfone due to change in  crystallite size and d-spacing. It was  diagnosed that crystallite size and d-spacing  decreases with increase in degree of sensitization. The reduction in transmittance of FT-IR peaks, band gap and  crystallite size of polysulfone with increase of doping concentration explains a charge transfer complex (CTC) formation between dopant and polymer matrix. These results confirm the improvement of dielectric and electrical properties of polysulfone due to doping of ferrocene.