In this paper, an electrochemical aptamer sensor was proposed for the highly sensitive detection of mercury ion (Hg²⁺). Carbon nanofiber (CNF) was prepared by electrospinning and high‐temperature carbonization, which was used for the loading of platinum nanoparticles (PtNPs) by the hydrothermal method. The Pt@CNF nanocomposite was modified on the surface of carbon ionic liquid electrode (CILE) to obtain Pt@CNF/CILE, which was further decorated by gold nanoparticles (AuNPs) through electrodeposition to get Au/Pt@CNF/CILE. Self‐assembling of the thiol‐based aptamer was further realized by the formation of Au‐S bond to get an electrochemical aptamer sensor (Aptamer/Au/Pt@CNF/CILE). Due to the specific binding of aptamer probe to Hg²⁺ with the formation of T‐Hg²⁺‐T structure, a highly sensitive quantitative detection of Hg²⁺ could be achieved by recording the changes of current signal after reacting with Hg²⁺ within the concentration range from 1.0 × 10⁻¹⁵ mol/L to 1.0 × 10⁻⁶ mol/L and the detection limit of 3.33 × 10⁻¹⁶ mol/L (3σ). Real water samples were successfully analyzed by this method.

中文翻译：

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电化学适体传感器，用于通过Au / Pt @碳纳米纤维修饰的电极高度灵敏地检测汞离子

本文提出了一种电化学适体传感器，用于高灵敏度检测汞离子（Hg ²⁺）。碳纳米纤维（CNF）是通过静电纺丝和高温碳化制备的，用于通过水热法负载铂纳米颗粒（PtNPs）。在碳离子液体电极（CILE）的表面上修饰Pt @ CNF纳米复合材料，以获得Pt @ CNF / CILE，然后通过电沉积进一步用金纳米粒子（AuNPs）装饰得到Au / Pt @ CNF / CILE。通过形成Au-S键以获得电化学适体传感器（Aptamer / Au / Pt @ CNF / CILE），进一步实现了基于硫醇的适体的自组装。由于适体探针与Hg ²⁺特异性结合并形成T-Hg ²⁺‐T结构，通过在1.0×10 ^-15 mol / L至1.0×10 ^-6 mol / L的浓度范围内记录与Hg ²⁺反应后的电流信号变化，可以实现高灵敏度的Hg ²⁺定量检测。L的检出限为3.33×10 ^-16 mol / L（3σ）。用这种方法成功地分析了真实的水样。