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Jang, Ji-Hyun
Nano Crystal Lab (NCL)
Research Interests
  • Graphene, photoelectrochemical (PEC) H2 generation, ORR/OER, SERS,3D-Nanostructures, supercapacitors, thermoelectric materials

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An optimal substrate design for SERS: dual-scale diamond-shaped gold nano-structures fabricated via interference lithography

Cited 15 times inthomson ciCited 12 times inthomson ci
Title
An optimal substrate design for SERS: dual-scale diamond-shaped gold nano-structures fabricated via interference lithography
Author
Ahn, Hyo-JinThiyagarajan, PradheepJia, LinKim, Sun-IYoon, Jong-ChulThomas, Edwin L.Jang, Ji-Hyun
Keywords
Different length scale; Finite-difference time-domain (FDTD) methods; Gold Nanoparticles; Gold nanostructures; Interference lithography; Light-trapping; Multipoles; Plasmon oscillations; Plasmonic; Scale structures; SERS enhancement; Sers enhancement factors; Small size particles; Substrate design; Surface enhanced Raman Scattering (SERS)
Issue Date
2013
Publisher
ROYAL SOC CHEMISTRY
Citation
NANOSCALE, v.5, no.5, pp.1836 - 1842
Abstract
Dual-scale diamond-shaped gold nanostructures (d-DGNs) with larger scale diamond-shaped gold nanoposts (DGNs) coupled to smaller scale gold nanoparticles have been fabricated via interference lithography as a highly reliable and efficient substrate for surface enhanced Raman scattering (SERS). The inter-and intra-particle plasmonic fields of d-DGNs are varied by changing the periodicity of the DGNs and the density of gold nanoparticles. Because of the two different length scales in the nanostructures, d-DGNs show multipole plasmonic peaks as well as dipolar plasmonic peaks, leading to a SERS enhancement factor of greater than 10(9). Simulations are carried out by finite-difference time-domain (FDTD) methods to evaluate the dependence of the inter-and intra-particle plasmonic field and the results are in good agreement with the experimentally obtained data. Our studies reveal that the combination of two different length scales is a straightforward approach for achieving reproducible and great SERS enhancement by light trapping in the diamond-shaped larger scale structures as well as efficient collective plasmon oscillation in the small size particles.
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DOI
http://dx.doi.org/10.1039/c3nr33498h
ISSN
2040-3364
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