Controlled Living Nanowire Growth: Precise Control over the Morphology and Optical Properties of AgAuAg Bimetallic Nanowires
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- 作者：Martin Mayer ; Leonardo Scarabelli ; Katia March ; Thomas Altantzis ; Moritz Tebbe ; Mathieu Kociak ; Sara Bals ; F. Javier Garc铆a de Abajo ; Andreas Fery ; Luis M. Liz-Marz谩n
- 刊名：Nano Letters
- 出版年：2015
- 出版时间：August 12, 2015
- 年：2015
- 卷：15
- 期：8
- 页码：5427-5437
- 全文大小：635K
- ISSN：1530-6992
文摘
Inspired by the concept of living polymerization reaction, we are able to produce silver鈥揼old鈥搒ilver nanowires with a precise control over their total length and plasmonic properties by establishing a constant silver deposition rate on the tips of penta-twinned gold nanorods used as seed cores. Consequently, the length of the wires increases linearly in time. Starting with 鈭?10 nm 脳 32 nm gold cores, we produce nanowire lengths up to several microns in a highly controlled manner, with a small self-limited increase in thickness of 鈭? nm, corresponding to aspect ratios above 100, whereas the low polydispersity of the product allows us to detect up to nine distinguishable plasmonic resonances in a single colloidal solution. We analyze the spatial distribution and the nature of the plasmons by electron energy loss spectroscopy and obtain excellent agreement between measurements and electromagnetic simulations, clearly demonstrating that the presence of the gold core plays a marginal role, except for relatively short wires or high-energy modes.