Advanced Photon Source , Argonne National Laboratory , Lemont , Illinois 60439-4854 , United States.
Chemistry Department, Faculty of Science , Assiut University , Assiut 71516 , Egypt.
ACS Appl Mater Interfaces. 2018 Jun 27;10(25):21103-21112. doi: 10.1021/acsami.8b02900. Epub 2018 Jun 15.
A new electrosynthetic approach for the fabrication of three-dimensional bicontinuous nanoporous platinum-based (3D-BC-NP-Pt(Au)) electrodes is described. Binary Pt-Ag alloys are first electrodeposited on gold substrates from appropriately formulated plating solutions. Following annealing and dealloying, a new family of nanoporous platinum-based electrodes emerges whose morphology, porosity, and chemical compositions depend on electrodeposition parameters and plating solution composition. Scanning electron microscopy images reveal an interesting and distinctive nanoporous gold-like microstructure with pores and ligaments in the 10-30 nm range arranged in a bicontinuous fashion throughout the thickness of the film. X-ray photoelectron spectroscopy (XPS) confirms that the as-formed electrodeposited films are silver-rich platinum binary alloys. Interestingly, XPS also reveals that after annealing and dealloying, the electrodes are actually ternary alloys containing platinum, gold, and a small amount of residual silver that remains after dealloying. Electrochemical measurements are consistent with this result and disclose a high surface area with roughness factors of 15-24. The ability to successfully conduct electrochemical measurements in biofouling solutions via a unique biosieving-like mechanism is demonstrated by exposure of the unique 3D bicontinuous nanoporous platinum-based electrode to fibrinogen in phosphate buffer and in a solution containing red blood cells. The work described herein has the potential to enrich the fields of electrochemical sensing and biosensing via the introduction of new 3D bicontinuous nanostructured porous platinum-based electrodes that can be easily and reliably fabricated.
一种新的电化学合成方法被用于制备三维连续纳米多孔铂基（3D-BC-NP-Pt(Au)）电极。首先，从适当配制的电镀液中在金基底上电沉积二元 Pt-Ag 合金。随后进行退火和脱合金处理，一种新的纳米多孔铂基电极家族便应运而生，其形态、孔隙率和化学成分取决于电沉积参数和电镀液组成。扫描电子显微镜图像揭示了一种有趣且独特的纳米多孔金样微观结构，其孔径和连接体在 10-30nm 范围内呈连续排列，贯穿整个薄膜厚度。X 射线光电子能谱（XPS）证实了所形成的电沉积薄膜是富含银的铂二元合金。有趣的是，XPS 还表明，退火和脱合金后，电极实际上是含有铂、金和少量脱合金后残留银的三元合金。电化学测量结果与这一结果一致，并显示出高的比表面积和 15-24 的粗糙度因子。通过独特的生物筛样机制，在含有纤维蛋白原的磷酸盐缓冲液和含有红细胞的溶液中，将独特的 3D 连续纳米多孔铂基电极暴露于其中，证明了其在生物污垢溶液中进行电化学测量的能力。本文所述的工作有可能通过引入新型的 3D 连续纳米多孔铂基电极来丰富电化学传感和生物传感领域，这些电极易于制造且可靠。
