ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Plasma-assisted synthesis of MnO₂–polyaniline composite for electrochemical sensing of dopamine

Sadik Cogal, Gamze Celik Cogal, and Aysegul Uygun Oksuz

Department of Chemistry, Faculty of Arts and Science, Burdur Mehmet Akif Ersoy University, Burdur, Turkey

E-mail: sadik_cogal@yahoo.com

Received: 28 November 2020  Accepted: 8 March 2021

Abstract:

An electrochemical-sensing platform for determination of dopamine (DA) was fabricated using MnO₂–polyaniline (MnO₂–PANI) composite. The MnO₂–PANI composite was prepared through in situ radio-frequency plasma polymerization of aniline monomer over MnO₂ under rotating conditions and followed by external iodine doping to boost conductivity of final I₂–MnO₂–PANI sample. The structural and morphological analyses of the composite were carried out using Fourier-transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy. Differential pulse voltammetry was used as an effective electrochemical method for detection of dopamine. I₂–MnO₂–PANI composite-based sensor shows enhanced electrocatalytic activity and high selectivity towards DA in the presence of its major interferences, which are ascorbic acid and uric acid. The sensor showed a linear detection range from 12.4 to 185.2 μM with a detection limit of 2.4 μM. The sensor also exhibited long-term stability and reproducibility. Plasma process offers facile and fast production of electrode materials.

Keywords: Plasma polymerization; MnO2; Polyaniline; Dopamine; And sensor

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-021-01596-w

Chemical Papers 75 (10) 5163–5171 (2021)