| 论文简介 |
The surface-enhanced Raman signals of 4-Aminobenzenethiol (4-ABT) adsorbed on the surface of triangular Au-
AuAg hierarchical-multishell nanostructure have been investigated. Here, the approach to produce core-cavity-
shell sandwich nanostructures presented as Au-AuAg is the same as preparing metal nanoparticles with hollow
morphology, in which the galvanic replacement reaction takes place between silver and chloroauric acid. In this
paper, we directly mix 4-ABT with gold nanoparticles and drop it on glass slides to study the effect of nanopar-
ticles on signal enhancement of Raman spectrum, avoiding the cumbersome process of preparing metal-
molecular-metal three-layer structureas reported. A significant increase inthe SERSintensity of b 2 mode around
1140 cm −1 was observed, which could quantify the concentration of 4-ABT indirectly. In a certain range, the
Raman intensity gradually increases with the increasing intermediate gap, which has a strong relationship
with dipole plasmon hybridization of core-dielectric-shell sandwich nanostructure. Moreover, Raman spectrum
results show that the Au-AuAg substrate can produce signal intensity about 3.8 × 10 2 times stronger than that of
4-ABT alone and the detection limit was as low as 0.1 μM in solution.
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