School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China.
Biosens Bioelectron. 2011 Sep 15;27(1):160-6. doi: 10.1016/j.bios.2011.06.036. Epub 2011 Jul 7.
Nanoporous silver (NPS) and copper (NPC) obtained by dealloying AgAl and CuAl alloys, respectively, were used as both three-dimensional templates and reducing agents for the fabrication of nanoporous PtAg (NPS-Pt) and PtCu (NPC-Pt) alloys with hollow ligaments by a simple galvanic replacement reaction with H(2)PtCl(6). Electron microscopy and X-ray diffraction characterizations demonstrate that NPS and NPC with similar ligament sizes (30-50 nm) have different effects on the formed hollow nanostructures. For NPS-Pt, the shell of the hollow ligament is seamless. However, the shell of NPC-Pt is comprised of small pores and alloy nanoparticles with a size of ∼3 nm. The as-prepared NPS-Pt and NPC-Pt exhibit remarkably improved electrocatalytic activities towards the oxidation of ethanol and H(2)O(2) compared with state-of-the-art Pt/C catalyst, and can be used for sensitive electrochemical sensing applications. The hierarchical nanoporous structure also provides a good microenvironment for enzymes. After immobilization of glucose oxidase (GOx), the enzyme modified nanoporous electrode can sensitively detect glucose in a wide linear range (0.6-20 mM).
通过分别脱合金 AgAl 和 CuAl 合金得到的纳米多孔银 (NPS) 和铜 (NPC) 被用作制备具有中空链节的纳米多孔 PtAg (NPS-Pt) 和 PtCu (NPC-Pt) 合金的三维模板和还原剂，通过与 H(2)PtCl(6) 的简单电置换反应来实现。电子显微镜和 X 射线衍射表征表明，具有相似链节尺寸（30-50nm）的 NPS 和 NPC 对形成的中空纳米结构具有不同的影响。对于 NPS-Pt，中空链节的壳层是无缝的。然而，NPC-Pt 的壳层由具有约 3nm 尺寸的小孔和合金纳米颗粒组成。与最先进的 Pt/C 催化剂相比，所制备的 NPS-Pt 和 NPC-Pt 对乙醇和 H(2)O(2)的氧化表现出显著提高的电催化活性，并且可用于灵敏的电化学传感应用。分层纳米多孔结构也为酶提供了良好的微环境。固定化葡萄糖氧化酶 (GOx) 后，酶修饰的纳米多孔电极可以在宽线性范围内（0.6-20mM）灵敏地检测葡萄糖。
