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Growth of Silver Nanowires from Controlled Silver Chloride Seeds and Their Application for Fluorescence Enhancement Based on Localized Surface Plasmon Resonance

Authors
Bae, SunwoongHan, HyejiBae, Jin GookLee, Eun YeolIm, Sang HyukKim, Do HyunSeo, Tae Seok
Issue Date
6-6월-2017
Publisher
WILEY-V C H VERLAG GMBH
Keywords
Ag nanowires; fluorescence enhancement; localized surface plasmon resonance; microfluidic droplets; seed-mediated synthesis
Citation
SMALL, v.13, no.21
Indexed
SCIE
SCOPUS
Journal Title
SMALL
Volume
13
Number
21
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/83156
DOI
10.1002/smll.201603392
ISSN
1613-6810
Abstract
A Polyol method has granted low-cost and facile process-controllability for silver-nanowire (Ag-NW) synthesis. Although homogenous and heterogeneous nucleation and growth during Ag-NW synthesis are possible using polyol methods, heterogeneous nucleation and growth of Ag NW guarantees highly selective growth of nanostructures using silver chloride (AgCl) seeds, which provides a stable source of chloride ions (Cl-) and thermodynamic reversibility. In this paper, a microdroplet has been adopted to synthesize uniform AgCl seeds with different diameter that are used for seed-mediated Ag-NW synthesis. The concentration of two precursors (AgNO3 and NaCl) in the droplets is modulated to produce different sizes of AgCl seeds, which determines the diameter and length of Ag NWs. The process of the seed-mediated growth of Ag NWs has been monitored by observing the peak shift in the time-resolved UV-vis extinction spectrum. Furthermore, the distinct plasmonic property of Ag NWs for transverse and longitudinal localized-surface-plasmon-resonance (LSPR)-mediated fluorescence enhancement is utilized. The high aspect ratio and sharp tips work as simple antennas that induce the enhanced fluorescence emission intensity of a fluorophore, which can be applied in the fields of biological tissue imaging and therapy.
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