Synthesis of conductive polymethyl red film for electrochemical sensing application – poster

A. Adeosun, Abdullah M. Asiri and Hadi M. Marwani
Department of Chemistry, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia.
E-mail: dsnwaheed1@gmail.com

This study reported synthesis of polymethyl red thin film by electropolymerization technique for sensitive detection of 2-nitrophenol (2-NP), a known environmental pollutant and carcinogen. The synthesized conductive polymethyl red (PMR) film was characterized using field emission scanning electron microscopy, Fourier Transform Infrared spectroscopy, x-ray photoelectron spectroscopy, electron diffraction x-ray spectroscopy and cyclic voltammetry. Due to its high conductivity and electro-catalytic property, the synthesized PMR film catalyzed electro-reduction process of 2-NP at a potential of -0.5 V. The limit of detection and sensitivity of PMR thin film for 2-NP were 0.15 µM (S/N = 3) and 95.0 µAµM^-1cm^-2 respectively. The proposed sensor also showed highly reproducible, repeatable and stable current responses to 2-NP. Finally, suitability of PMR film in detection of 2-NP in real environmental samples was established. Based on the result of these electrochemical studies, PMR film is a promising electrochemical sensor for 2-NP for human health protection and environmental management.

Keywords: Thin film synthesis; linear sweep voltammetry; 2-nitrophenol detection; polymethyl red; Sensor