Journal
NANO LETTERS
Volume 10, Issue 12, Pages 5006-5013Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl103161q
Keywords
Gold mesostructures; sea urchin-like; surface topography; self-assembly; SERS
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Funding
- Alexander-von Humboldt Foundation
- National Basic Research Program of China [2010CB635101]
- Fundamental Research Funds for the Central Universities [08142008]
- National Natural Science Foundation of China [50901056, 50834003]
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We report a facile particle mediated aggregation protocol to synthesize sea urchin-like gold mesoparticles with tailored surface topography via a secondary nucleation and growth process. Surprisingly, these multitip Au mesoparticles are capable of self-assembling into monolayer or multiple layer arrays on Si substrates with a convincing reproducibility and homogeneity over large areas. Raman measurements show that these individual sea urchin-like multitipped gold mesoparticles exhibit a high enhancement of surface-enhanced Raman scattering (SERS). In addition, the sea urchin-like mesoparticle arrays display a further enhancement of SERS by 1 or 2 orders of magnitude over the individual mesoparticle due to the formation of additional hot spots between the particles. The current protocol stands out as a potentially interesting approach for the fabrication of technologically important SERS-based sensors.
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