Investigation of the fractal behavior of the polypyrrole

Summary form only given. Polypyrrole(PPy) made by chemical polymarization is not perfectly surface smooth. The PPy thin layer was studied in terms of fractal dimension geometry to understand the properties of surface of the PPy. Measurement of the fractal dimension, Ds , of PPy is reported using small-angle X-ray scattering up to Porod´s region. Preliminary results indicate that the scattering intensity I is power-law decay, I(q) /spl tilde/ q/sup -/spl prop//, for values of the scattering vector q between 0.03 and 0.58 /spl Aring//sup -1/. The exponent /spl prop/ is smaller than four given by Porod,s law. Ds is found to be 3.67 in agreement with surface fractals, and conditions compatible with the formation of electrochemical polymarization of low fractal dimension resulted in relatively smooth films, while condition that yielded high fractal dimension resulted in rougher layers. This technique is therefore applicable to the optimisation of PPy thin layer.