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Cooperative surface‐enhanced Raman spectroscopy enhancement in Au nanorod/SiO 2 nanoparticle solutions
Author(s) -
Nam Jihye,
Duy Pham Khac,
Seo Chunhee,
Eom Sangwon,
Minh Duong Nguyen,
Lee Jisun,
Sim Jae Hyun,
Chung Hoeil,
Kang Youngjong
Publication year - 2019
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.5654
Subject(s) - nanorod , rhodamine 6g , raman spectroscopy , crystal violet , surface plasmon resonance , materials science , nanoparticle , surface enhanced raman spectroscopy , analytical chemistry (journal) , plasmon , raman scattering , nanotechnology , chemistry , optoelectronics , optics , molecule , medicine , physics , organic chemistry , pathology , chromatography
Surface‐enhanced Raman spectroscopy (SERS) signals in liquid state are significantly enhanced by utilizing cooperative interaction between metal surface plasmon and dielectric resonance. Raman signals from the diluted solutions are very weak even if they are amplified by SERS using Au nanorods. When SiO 2 nanoparticles are added together with Au nanorods, however, Raman intensity increased by three order comparing with that of system containing only Au nanorods. Finite‐difference time‐domain simulations show that SiO 2 nanoparticles exhibit dipolar electric resonance, which is strongly enhanced by interacting with the surface plasmon of Au nanorods. The size and concentration of SiO 2 nanoparticles are optimized to 354 nm in diameter and 4.5 vol%. Under the optimized condition, SERS intensity decrease with concentration of analyte (rhodamine 6G or crystal violet) is much slower for the system containing both Au nanorods and SiO 2 nanoparticles than that of the system containing only Au nanorods. The detection limit is 10 −10 M for both aqueous rhodamine 6G and crystal violet solutions.