Synthesis and optical characterization of acid-doped polyaniline thin films

Abstract

Polyaniline has attracted much interest among researchers because of its reasonably good conductivity, stability, ease of preparation, affordability and redox properties compared to other organic compounds. In this work, Polyaniline (PANI) thin films were synthesized by chemical oxidative polymerization of aniline in the presence of Hydrochloric acid using Ammonium peroxydisulfate as an oxidizing agent. The synthesised PANI thin films, doped with Tetraoxosulphate VI acid (H2SO4) and Citric acid, were characterised using UV-Vis spectroscopy to investigate the variations in the optical properties. The thin films were found to be of the same thickness (0.2µm) and their absorption spectra revealed two absorption peaks at around 300nm and 650nm for the pure PANI and the sample doped with Citric acid while that doped with H2SO4 had its peaks at 300 nm and 880nm. Doping reduced the direct band gap of the PANI from 2.75eV to 2.4eV.

Impact of dopant ratio on the energy harvesting activity of polyaniline modified counter electrodes for Pt‐free dye‐sensitized solar cells

“…Stronger absorption of this band represents the protonation of the synthesized material. [ 31 ] The band positions, intensity, and intensity ratios (A 2 /A 1 ) of the second band (A 2 ) to the first band (A 1 ) of the synthesized PANI samples are listed in Table 2. The values of A 2 /A 1 for P‐2.3 are larger compared to others indicating the high doping level of this sample.…”

Sintesis Polianilin (PANI) yang di Doping Besi (III) Oksida Menggunakan Metode Fotopolimerisasi

“…Penelitian tentang polimer konduktif telah banyak dilakukan beberapa tahun terakhir dikarenakan sifat termal, listrik dan magnetik yang unik serta pengaplikasiannya dalam teknologi modern, bahan untuk perangkat elektronik dan bahan sensor kimia. Polimer konduktif yang sering digunakan untuk bahan sensor kimia adalah polypyrrole, polythyophene, dan polyaniline [1].…”

“…Skema rangkaian Four Point ProbeKonduktivitas suatu bahan atau sampel dapat diperoleh dengan menggunakan persamaan berikut: …………………………. (1).…”