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Issue 5, 2019
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Silver nano-needles: focused optical field induced solution synthesis and application in remote-excitation nanofocusing SERS

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Abstract

Tapered metallic nanostructures that harbor surface plasmons are highly interesting for nanophotonic applications because of their waveguiding and field-focusing properties. Here, we developed a focused optical field induced solution synthesis for unique crystallized silver nano-needles. Under the focused laser spot, inhomogeneous Ag monomer concentration is created, which triggers the uniaxial growth of silver nanostructures along the radial direction with decreasing rate, forming nano-needle structures. These nano-needles are several micrometers long, with diameter attenuating from hundreds to tens of nanometers, and terminated by a sharp apex only a few nanometers in diameter. Moreover, nano-needles with atomically smooth surfaces show excellent performance for plasmonic waveguiding and unique near-field compression abilities. This nano-needle structure can be used for effective remote-excitation detection/sensing. We also demonstrate the assembling and picking up of nano-needles, which indicate potential applications in intracellular endoscopy, high resolution scanning tips, on-chip nanophotonic devices, etc.

Graphical abstract: Silver nano-needles: focused optical field induced solution synthesis and application in remote-excitation nanofocusing SERS

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Article information


Submitted
02 Sep 2018
Accepted
12 Oct 2018
First published
16 Oct 2018

Nanoscale, 2019,11, 2153-2161
Article type
Paper

Silver nano-needles: focused optical field induced solution synthesis and application in remote-excitation nanofocusing SERS

P. Li, D. Pan, L. Yang, H. Wei, S. He, H. Xu and Z. Li, Nanoscale, 2019, 11, 2153
DOI: 10.1039/C8NR07141A

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