Journal
NANO LETTERS
Volume 12, Issue 12, Pages 6218-6222Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3032235
Keywords
Anisotropic nanoparticle; hot spot; surface-enhanced Raman scattering; concave nanocube
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Funding
- DoD/NSSEFF Program/Naval Postgraduate School [N00244-09-1-0012, N00244-09-1-0071]
- AFOSR [FA9550-09-1-0294]
- National Science Foundation's MRSEC program at the Materials Research Center of Northwestern University [DMR-0520513, DMR-1121262]
- Non-equilibrium Energy Research Center (NERC), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000989]
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We report a simple and general strategy for selectively exposing and functionalizing the sharp corners of concave nanocubes, which are the SEAS hot spots for such structures. This strategy takes advantage of the unique shape of the concave cubes by coating the particles with silica and then etching it away to expose only the corner regions, while maintaining the silica coating in the concave faces. These corner regions can then be selectively modified for improved enhancement and signal response with SERS.
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