A complementary study of surface-enhanced Raman scattering and metal
nanorod arrays
J. L. Yao, G. P. Pan, K. H. Xue, D. Y. Wu, B. Ren, D. M. Sun, J. Tang,
X. Xu and Z. Q. Tian*
*State Key Laboratory for Physical Chemistry of Solid
Surfaces and Institute of Physical Chemistry, Xiamen University, Xiamen
361005, China
Abstract: The two-dimensional arrays of various metal nanowires
with diameters ranging from 15 to 70 nm have been fabricated by electrodepositing
metals of Cu, Ag, Au, Ni, and Co into the nanoholes of the anodic aluminum
oxide (AAO) films, followed by partial removal of the film. The strong
surface-enhanced Raman scattering (SERS) effects were observed from
the metal nanowire arrays including Ni, Co metals that were normally
considered to be non-SERS active substrates. It has been shown that
metal nanowire arrays can serve as very good SERS active substrates,
especially for transition metals. The SERS intensity of the probe molecule
adsorbed at the nanowires depends critically on the length of the nanowires
explored at the surface. And the band frequency is very sensitive to
the diameter, which reflects the change in the electronic property of
metal nanowires. Applying this probe molecule strategy, SERS could develop
into a diagnostic tool of metal nanowires (nanorods).
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