Bandgap determination of chemically doped polyaniline materials from reflectance measurements

Spectroscopic techniques are very useful for characterizing semiconducting and conducting materials. The optical properties (specially reflection spectra) of polyaniline mix with metal Mn and Fe with different compositionin bulk form were studied. The reflection spectra of these materials are recorded by a Hitachi spectro-photometer model (330), at room temperature, in the wavelength range 300-600 nm. From the analysis of reflection spectra, polyaniline mix with metal Mn and Fe have been found to have energy bandgap which decreases with increase of concentration of iron. An effort has also been made to study the structure formation using XRD techniques.