期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 1, 期 35, 页码 5567-5576出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc30824c
关键词
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资金
- Natural Science Foundation of Shaanxi Province [2012JQ6006]
- National Natural Science Foundation of China [51171139, 51201122]
- Doctoral Fund for New Teachers [20120201120049, 20110201120039]
- Tengfei Talent Project of Xi'an Jiaotong University
- New Century Excellent Talents in University (NCET)
- Scientific New Star Program in Shaanxi Province [2012KJXX-03]
- Fundamental Research Funds for the Central Universities
Understanding of the influence of nanotextured surface topographies on surface-enhanced Raman scattering (SERS) is still rather limited, even after intensive research in recent years; this is mainly due to the absence of a synthesis system to control the surface morphologies on metal meso-/nanoparticles. Here, a facile particle-mediated aggregation protocol was reported to synthesize a series of uniform gold mesoparticles with a nanotextured rough surface. The surface topographies can be precisely controlled by varying the temperatures and concentrations of dopa and Au ions. For example, the tips can be well changed from half-sphere to spike, and then to blade, and the size of the tips also can be tuned, such that the thickness of the blade-like tips can be artificially controlled from 9 to 14 nm. Single-particle SERS analysis reveals that the uniform Au mesoparticles with highly nanotextured topography have enhancement factors greater than 1.0 x 10(8) with narrow distribution. The effect of the precisely controlled mesoparticle topographies on SERS properties was deeply studied using Raman analysis and finite-difference time-domain (FDTD) simulation. The result indicated that a strong electric field will be induced at the tips and slits on the flower-like mesoparticle surface by the confined light in the cavities between the petals. As such, the current protocol opens up avenues for the fabrication of structurally reproducible mesosuperstructure-based SERS sensors.
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