Structure of Tiopronin-Protected Silver Nanoclusters in a One-Dimensional Assembly

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• 作者：J. Daniel Padmos ; Robert T. M. Boudreau ; Donald F. Weaver ; Peng Zhang
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：October 29, 2015
• 年：2015
• 卷：119
• 期：43
• 页码：24627-24635
• 全文大小：525K
• ISSN：1932-7455

文摘

The preparation and characterization of all-thiol-protected noble-metal nanoclusters represent significant advancements in the field of nanomaterials. One of the emerging trends in the study of silver nanoclusters in particular, is the generation of sulfide-type silver at their surfaces as a result of surface protection by thiols. Here, X-ray absorption spectroscopy (XAS) was used to identify the structure and composition of 2 nm tiopronin-protected silver nanoclusters arranged in one-dimensional chains. Silver K-edge XAS multipath refinements and wavelet-transformed XAS analysis found that the nanoclusters comprised small metal cores surrounded by thick sulfide-type shells. This further demonstrates that the sulfide-type shell is a prevalent surface structure throughout silver nanoclusters protected by thiols. In addition, the antibacterial activities of the nanoclusters were also examined; they were found to be active against both Gram-positive and Gram-negative bacteria, thereby shedding light on the effects of both the surface structure and the special arrangement of the nanoclusters.