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Surface enhanced Raman scattering of molecules related to highly ordered gold cavities
Author(s) -
Gu Zhuomin,
Tian Shu,
Zhou Qun,
Wei Wenjuan,
Zhao Lili,
Li Xiaowei,
Zheng Junwei
Publication year - 2013
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.4384
Subject(s) - raman scattering , colloidal gold , raman spectroscopy , molecule , nanoparticle , bromide , polystyrene , substrate (aquarium) , materials science , nanotechnology , cationic polymerization , chemistry , chemical engineering , polymer chemistry , inorganic chemistry , optics , organic chemistry , polymer , composite material , physics , oceanography , geology , engineering
We presented a controlled particles‐in‐cavity (PIC) pattern for surface‐enhanced Raman scattering (SERS) detection. The periodic gold cavity array was fabricated by electrodeposition using highly ordered polystyrene spheres as a template. The as‐prepared gold cavities can be used as a SERS active substrate with significant spectral enhancement and reproducibility, which was evaluated by SERS signals using 4‐mercaptobenzoic acid (4‐MBA) as probe molecules. The surface of these gold cavities was further functionalized with cetyltrimethylammonium bromide molecules, which may immobilize the 4‐MBA‐modified silver nanoparticles in the gold cavity to form a PIC structure via the electrostatic interaction. We have demonstrated that there exists a pH window for the immobilization of the nanoparticles inside cavities. Therefore, the silver nanoparticles can be selectively immobilized into the functionalized gold cavities under the optimized pH value of the media. Further enhancement of the Raman scattering of the labeled molecules can be achieved due to the interconnection between the silver nanoparticles and gold cavity. Copyright © 2013 John Wiley & Sons, Ltd.