Synthesis and characterization of Poly (ortho-aminophenol-co-para-toluidine) and its application as semiconductor thin film

Abstract

Hydrochloric acid doped poly (ortho-aminophenol–co-para-toluidine) as a conjugated semiconducting copolymer is synthesized in acidic medium via the oxidative polymerization method. The spin coating technique is applied to deposit with appropriate adhesion of doped copolymer thin film. The resulting doped poly (ortho-aminophenol–co-para-toluidine) (POAPT) thin film is characterized by the various techniques to explore its structural, morphological, and optical properties. Density-functional theory (DFT) calculations were implemented utilizing Cambridge Serial Total Energy Package (CASTEP) from Accelrys based on a plane-wave pseudopotential. The optical dispersion of poly (ortho-aminophenol–co-para-toluidine) thin film is expressed in the single oscillator terms of Wemple–Didomenico (WD) model. The parameters Eg is 2.02 eV, n and k (at 2.36 eV) are 1.73 and 3.27×10-8, respectively, n∞ is 1.633, λo is 172.65 nm and So is 2.126 nm-2. Based on the resulting data of optical analysis and conductivity the doped poly (ortho-aminophenol–co-para-toluidine) thin film was found to have promising applications in optoelectronic devices area.