Chemically Isolating Hot Spots on Concave Nanocubes

We report a simple and general strategy for selectively exposing and functionalizing the sharp corners of concave nanocubes, which are the SERS 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...

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Veröffentlicht in:	Nano Letters 2012-12, Vol.12 (12), p.6218-6222
Hauptverfasser:	Rycenga, Matthew, Langille, Mark R, Personick, Michelle L, Ozel, Tuncay, Mirkin, Chad A
Format:	Artikel
Sprache:	eng
Schlagworte:	catalysis (homogeneous), solar (photovoltaic), bio-inspired, charge transport, mesostructured materials, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly) Coating Condensed matter: structure, mechanical and thermal properties Corners Cross-disciplinary physics: materials science rheology Cubes Etching Exact sciences and technology Exposure Hot spots Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties Materials science Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Nanostructure Physics Silicon dioxide Strategy Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties)
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Beschreibung
Zusammenfassung:	We report a simple and general strategy for selectively exposing and functionalizing the sharp corners of concave nanocubes, which are the SERS 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.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl3032235