Soreta Tesfaye Refera, Strutwolf Jorg, O'Sullivan Ciara K
Nanobiotechnology and Bioanalysis Group, Department of Chemical Engineering, Universitat Rovira I Virgili, Avinguda Països Catalans, 26, 43007, Tarragona, Spain.
Langmuir. 2007 Oct 9;23(21):10823-30. doi: 10.1021/la7006777. Epub 2007 Sep 12.
The vast majority of reports of self-assembled monolayers (SAMs) on metals focus on the use of gold. However, other metals, such as palladium, platinum, and silver offer advantages over gold as a substrate. In this work, palladium is electrochemically deposited from PdCl2 solutions on glassy carbon electrodes to form a substrate for alkanethiol SAMs. The conditions for deposition are optimized with respect to the electrolyte, pH, and electrochemical parameters. The palladium surfaces have been characterized by scanning electron microscopy (SEM) and the surface roughness has been estimated by chronocoulometry. SAMs of alkane thiols have been formed on the palladium surfaces, and their ability to suppress a Faradaic process is used as an indication for palladium coverage on the glassy carbon. The morphology of the Pd deposit as characterized by SEM and the blocking behavior of the SAM formed on deposited Pd delivers a consistent picture of the Pd surface. It has been clearly demonstrated that, via selection of experimental conditions for the electrochemical deposition, the morphology of the palladium surface and its ability to support SAMs can be controlled. The work will be applied to create a mixed monolayer of metals, which can subsequently be used to create a mixed SAM of a biocomponent and an alkanethiol for biosensing applications.
绝大多数关于金属表面自组装单分子层（SAMs）的报道都集中在金的应用上。然而，其他金属，如钯、铂和银，作为基底比金具有更多优势。在本工作中，钯从PdCl2溶液中电化学沉积在玻碳电极上，形成用于烷硫醇自组装单分子层的基底。沉积条件针对电解质、pH值和电化学参数进行了优化。通过扫描电子显微镜（SEM）对钯表面进行了表征，并通过计时电量法估算了表面粗糙度。在钯表面形成了烷硫醇自组装单分子层，其抑制法拉第过程的能力被用作钯在玻碳上覆盖程度的指标。通过扫描电子显微镜表征的钯沉积物形态以及在沉积钯上形成的自组装单分子层的阻断行为，给出了钯表面的一致情况。已经清楚地表明，通过选择电化学沉积的实验条件，可以控制钯表面的形态及其支持自组装单分子层的能力。这项工作将应用于创建金属混合单分子层，随后可用于创建生物组分和烷硫醇的混合自组装单分子层，用于生物传感应用。
