College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Anal Chem. 2013 May 21;85(10):5040-6. doi: 10.1021/ac400292n. Epub 2013 May 3.
A series of novel bimetallic PtCu nanochains have been synthesized through a water-based mild chemical route, and their compositions (Pt(x)Cu(1-x)) can be conveniently tuned at the mesoscopic scale by a facile dealloying process. These nanomaterials have been characterized by transmission electron microscope (TEM), high-resolution TEM (HRTEM), X-ray powder diffraction (XRD), and elemental analysis. They have different compositions (Pt88Cu12, Pt75Cu25, and Pt50Cu50) but have similar morphology. Electrochemical activity of these nanomaterials is compared to Pt and nanochains of Pt when they are chemically modified onto a glassy carbon electrode. Electrochemical measurements demonstrate that the sensors made by these PtCu nanomaterials are very sensitive and selective for glucose detection due to the wiring of dispersed crystals, porous nanostructure, clean surface, and synergetic electronic effects of the alloyed atoms. Among them, the modified electrode made of Pt75Cu25 shows the best performance. The superior catalytic activity and selectivity make nanomaterials, via the green synthesis, very promising for applications in direct biosensing of glucose.
通过水相温和的化学路线合成了一系列新型双金属 PtCu 纳米链，通过简便的脱合金过程可以在介观尺度上方便地调整它们的组成（Pt(x)Cu(1-x)）。这些纳米材料通过透射电子显微镜（TEM）、高分辨率 TEM（HRTEM）、X 射线粉末衍射（XRD）和元素分析进行了表征。它们具有不同的组成（Pt88Cu12、Pt75Cu25 和 Pt50Cu50），但具有相似的形态。将这些纳米材料化学修饰到玻璃碳电极上后，比较了它们与 Pt 和 Pt 纳米链的电化学活性。电化学测量表明，由于分散晶体的布线、多孔纳米结构、清洁的表面以及合金原子的协同电子效应，这些 PtCu 纳米材料制成的传感器对葡萄糖检测具有很高的灵敏度和选择性。其中，由 Pt75Cu25 修饰的电极表现出最佳性能。优异的催化活性和选择性使得通过绿色合成的纳米材料非常有希望应用于葡萄糖的直接生物传感。
