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Polypyrrole(PPy) thin films were deposited on stainless steel and ITO coated glass substrate at a constant deposition potential of 0.8 V versus saturated calomel electrode(SCE) by using the electrochemical polymerization method.The PPythin filmswere deposited at room temperatureat variousmonomer concentrations ranging from 0.1 M to 0.3 M pyrrole.The structural and optical properties of the polypyrrole thin films were investigated using an X-ray diffractometer(XRD),FTIR spectroscopy,scanning electron microscopy(SEM),and ultraviolet– visible(UV–vis) spectroscopy.The XRD results show that polypyrrole thin films have a semi crystalline structure.Higher monomer concentration results in a slight increase of crystallinity.The polypyrrole thin films deposited at higher monomer concentration exhibit high visible absorbance.The refractive indexes of the polypyrrole thin films are found to be in the range of 1 to 1.3 and vary with monomer concentration as well as wavelength.The extinction coefficient decreases slightly with monomer concentration.The electrochemically synthesized polypyrrole thin film shows optical band gap energy of 2.14 eV.
Polypyrrole (PPy) thin films were deposited on stainless steel and ITO coated glass substrates at a constant deposition potential of 0.8 V versus saturated calomel electrode (SCE) by using the electrochemical polymerization method. PPythin filmswere deposited at room temperatureat variousmonomer concentrations ranging from 0.1 M to 0.3 M pyrrole. The structural and optical properties of the polypyrrole thin films were investigated using an X-ray diffractometer (XRD), FTIR spectroscopy, scanning electron microscopy (SEM), and ultraviolet-visible (UV- XRD results show that polypyrrole thin films have a semi crystalline structure. Heavy monomer concentration results in a slight increase of crystallinity. Polypyrrole thin films deposited at higher monomer concentration exhibit high visible absorbance. The refractive indexes of the polypyrrole thin films are found to be in the range of 1 to 1.3 and vary with monomer concentration as well as wavelength. The extinction coe fficient decreases slightly with monomer concentration. The electrochemically synthesized polypyrrole thin film shows optical band gap energy of 2.14 eV.