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Controlled Assembly of Highly Raman‐Enhancing Silver Nanocap Arrays Templated by Porous Anodic Alumina Membranes
Author(s) -
Qiu Teng,
Zhang Wenjun,
Lang Xianzhong,
Zhou Yongjin,
Cui Tiejun,
Chu Paul K.
Publication year - 2009
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.200900577
Subject(s) - materials science , fabrication , raman scattering , membrane , nanostructure , raman spectroscopy , porosity , nanoscopic scale , anode , nanotechnology , deposition (geology) , chemical engineering , electrode , optics , composite material , chemistry , medicine , paleontology , biochemistry , physics , alternative medicine , engineering , pathology , sediment , biology
A convenient nanoscale technique is reported for the fabrication of highly ordered hemispherical silver nanocap arrays templated by porous anodic alumina (PAA) membranes as robust and cost‐efficient surface‐enhanced Raman scattering (SERS) substrates. This geometry produces a high Raman signal due to its periodic hexagonal arrangements and control of the gap between the nanostructures in the sub‐10‐nm regime. The surface structure can be tuned further to optimize the enhancement factor according to optional PAA fabrication and silver deposition parameters. Finite‐difference time‐domain calculations indicate that the structure may possess excellent SERS characteristics due to the high density and abundance of hot spots.