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).

本研究介绍了在L-半胱氨酸作为还原剂存在下，通过直接还原Pt（II）合成Pt / gC ₃ N ₄ /聚苯胺纳米复合材料（Pt / gC ₃ N ₄ / PAn NCs）。X射线衍射分析表明，在L-半胱氨酸存在下，Pt阳离子被还原为金属Pt。场发射扫描电子显微镜图像证实了在存在gC ₃ N ₄的情况下合成时，金属Pt的聚集度低。电化学阻抗谱结果表明，聚苯胺（PAn）可以补偿gC ₃ N ₄的低电导率。用Pt / gC修饰的玻璃碳电极₃ N ₄ / PAn NCs对Hg ²⁺的检测具有很高的选择性和灵敏度。gC ₃ N ₄和PAn中活性位点的存在增强了Hg ²⁺的吸附。伏安响应在1–500 nM Hg ²⁺的浓度范围内是线性的，检出限为0.014 nM（在S / N = 3时）。