SYNTHESIS OF IODINE DOPED n-BMA THIN FILMS VIA PLASMA POLYMERIZATION TECHNIQUE: EFFECT ON OPTICAL PROPERTIES

Abstract

In order to understand the variation of surface morphology and optical properties due to modification, an attempt has been made to synthesize iodine-doped n-butyl methacrylate thin films through plasma polymerization technique. Field emission scanning electron microscope images displayed that the surface of the modified plasma polymerized n-butyl methacrylate (PPnBMA) thin films became smooth after iodine doping. Atomic force microscopic analysis reveals that with increasing doping time from 0[Formula: see text]min to 60[Formula: see text]min the surface root-mean-square roughness value is decreased from 0.68[Formula: see text]nm to 0.51[Formula: see text]nm, which suggests that roughness of the PPnBMA thin film surface quite improved due to iodine doping. UV-Vis absorption spectroscopic analyses exhibited that iodine doping noticeably decreased both the direct and indirect energy bandgap values of PPnBMA thin film. The effect of doping by iodine on absorption coefficient, extinction coefficient, etc. of these thin films have been also discussed.