An electrochemical sensor based on Pt/g-C3N4/polyaniline nanocomposite for detection of Hg2+

• Main Authors: Mahmoudian, M. R., Alias, Y., Woi, Pei Meng, Yousefi, R., Basirun, W. J.
• Format: Article
• Published: Elsevier 2020
• Subjects: Q Science (General); QD Chemistry
• Online Access: http://eprints.um.edu.my/36521/

The synthesis of Pt/g-C3N4/polyaniline nanocomposites (Pt/g-C3N4/PAn NCs) via the direct reduction of Pt (II) in the presence of L-cysteine as the reducing agent is presented in this study. X-ray diffraction analysis showed that the Pt cations were reduced to metallic Pt in the presence of L-cysteine. Field emission scanning electron microscope images confirmed a low agglomeration of metallic Pt when synthesized in the presence of g-C3N4. Electrochemical impedance spectroscopy results showed that the low conductivity of g-C3N4 is compensated with the presence of polyaniline (PAn). A glassy carbon electrode modified with the Pt/g-C3N4/PAn NCs showed high selectivity and sensitivity for the detection of Hg2+. The presence of active sites in the g-C3N4 and PAn enhanced the adsorption of Hg2+. The voltammetric response was linear in the concentration range of 1-500 nM Hg2+, with the detection limit of 0.014 nM (at S/N = 3). (C) 2020 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.