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Web‐above‐a‐Ring (WAR) and Web‐above‐a‐Lens (WAL): Nanostructures for Highly Engineered Plasmonic‐Field Tuning and SERS Enhancement
Author(s) -
Lee Soohyun,
Lee Sungwoo,
Son Jiwoong,
Kim JaeMyoung,
Lee Junghwa,
Yoo Sungjae,
Haddadnezhad MohammadNavid,
Shin Jieun,
Kim Jeongwon,
Nam JwaMin,
Park Sungho
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202101262
Subject(s) - nanoring , materials science , plasmon , nanotechnology , nanostructure , raman scattering , kirkendall effect , raman spectroscopy , optoelectronics , optics , physics , metallurgy
Synthetic strategies of web‐above‐a‐ring (WAR) and web‐above‐a‐lens (WAL) nanostructures are reported. The WAR has a controllable gap between the nanoring core and a nanoweb with nanopores for the effective confinement of electromagnetic field in the nanogap and subsequent surface‐enhanced Raman scattering (SERS) of Raman dyes inside the gap with high signal reproducibility, which are attributed to the generation of circular 3D hot zones along the rim of Pt@Au nanorings with wrapping nanoweb architecture. More specifically, Pt@Au nanorings are adopted as a plasmonic core for structural rigidity and built porous nanowebs above them through a controlled combination of galvanic exchange and the Kirkendall effect. Both nanoweb and nanolens structures are also formed on Pt@Au nanoring, which is WAL. structure. Remarkably, plasmonic hot zone, nanopores, and hot lens are formed inside a single WAL nanostructure, and these structural components are orchestrated to generate stronger SERS signals.