Title
Controlled living nanowire growth : precise control over the morphology and optical properties of AgAuAg bimetallic nanowires Controlled living nanowire growth : precise control over the morphology and optical properties of AgAuAg bimetallic nanowires
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Washington ,
Subject
Physics
Source (journal)
Nano letters / American Chemical Society. - Washington
Volume/pages
15(2015) :8 , p. 5427-5437
ISSN
1530-6984
ISI
000359613700087
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Inspired by the concept of living polymerization reaction, we are able to produce silvergoldsilver 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 ∼210 nm × 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 ∼4 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.
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Full text (open access)
https://repository.uantwerpen.be/docman/irua/ccb46d/129687.pdf
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