论文期刊

Synthesis of colloidal gold nanobones with tunable negative curvatures at end surface and their application in SERS, Journal of Nanoparticle Research




作者: J. Zhu*, Q. Zhang, C.H. Zhang, G.J. Weng, J. Zhao, J.J. Li, J.W. Zhao*
发表/完成日期: 2017-11-23
期刊名称: Journal of Nanoparticle Research
期卷: 19
相关文章:
论文简介
In this work, gold nanobones with the length
from 50 to 70 nm were synthesized by a seed-mediated
method. The plasmonic optical properties and the roles
of gold seed amount in regulating the negative curvatures
of the end surfaces of the gold nanobones have
also been studied. Compared with the gold nanorods, a
new middle surface plasmon resonance (SPR) peak
appears in the absorption spectra due to the negative
curvatures on the end surfaces of the gold nanobones.
What is more, the surface enhanced Raman scattering
(SERS) activities of gold nanobones are much stronger
than that of gold nanorods. By controlling the amount of
the gold seed, the wavelength of the middle SPR peak
can be adjusted between 560 and 650 nm, and the
corresponding negative curvature of the end surfaces
could also be fine tuned. When the amount of gold seed
reaches saturation, the end surfaces of nanobones have
the strongest negative curvature, which results in the
greatest SERS activity. This improved SERS has been
attributed to the negative curvature-induced formation
of the antenna dimers. The orientation of plasmon coupling
between the antenna dimers is perpendicular to the
nanobones. Thus, the hot spots at the ends of nanobones
could always be created when the excitation beam
polarization is either parallel or perpendicular to the
nanobones. This negative curvature-dependent SERS
enhancement lays the foundation for the extensive application
of gold nanobones in SERS.