Herein, a nanocomposite of Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)/reduced graphene oxide (PEDOT:PSS/rGO) has been synthesized and modified with L-Cysteine (CySH) peptide in order to reveal the selective and sensitive determination of lead Pb(II) ions using electrochemical modality in the range of concentration 1–70 ppb. The PEDOT-PSS/rGO/CySH nanocomposite was characterized with X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), and electrochemical characterizations. Further, the electrochemical sensor was designed on glassy carbon electrode as PEDOT-PSS/rGO/CySH@GCE as an electroactive material which exhibited highly selective and sensitive sensing response for Pb(II) ions sensing. The limit of detection for Pb(II) was found to be 0.09 ppb, which is significantly better than the maximum Pb contamination limit in potable water (48 nM (10 parts per billion) advised by World Health Organization (WHO) and earlier reported studies as well.

本文中，已经合成了聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）/还原氧化石墨烯（PEDOT：PSS / rGO）的纳米复合材料，并用L-半胱氨酸（CySH）肽修饰，以揭示选择性和选择性。在浓度为1–70 ppb的范围内使用电化学方法灵敏地测定铅Pb（II）离子。通过X射线衍射（XRD），拉曼光谱，原子力显微镜（AFM）和电化学表征对PEDOT-PSS / rGO / CySH纳米复合材料进行了表征。此外，电化学传感器在玻璃碳电极上设计为PEDOT-PSS / rGO / CySH @ GCE，作为一种电活性材料，对Pb（II）离子感测表现出高度选择性和灵敏的感测响应。发现Pb（II）的检出限为0.09 ppb，