An electrochemical sensor based on Pt/g-C3N4/polyaniline nanocomposite for detection of Hg2+
Document Type
Article
Publication Date
8-1-2020
Abstract
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.
Keywords
Electrochemical sensor, Voltammetric sensing, g-C3N4, L-cysteine, Hg cation
Divisions
CHEMISTRY
Funders
FRGS [Grant No: FP071-2018A],RU Geran-Fakulti Program [Grant No: GPF064B-2018],Ministry of Higher Education, Malaysia [Grant No: PG093-2015B],Universiti Malaya [Grant No: PR003-2018A]
Publication Title
Advanced Powder Technology
Volume
31
Issue
8
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS