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).
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