Nanostructured Gold Films for SERS by Block Copolymer-Templated Galvanic Displacement Reactions
Autor(en): | Wang, Yong Becker, Michael Wang, Li Liu, Jinquan Scholz, Roland Peng, Juan Goesele, Ulrich Christiansen, Silke Kim, Dong Ha Steinhart, Martin |
Stichwörter: | Chemistry; Chemistry, Multidisciplinary; Chemistry, Physical; CRYSTAL VIOLET; Materials Science; Materials Science, Multidisciplinary; NANOPARTICLES; Nanoscience & Nanotechnology; Physics; Physics, Applied; Physics, Condensed Matter; PYRIDINE; ROUTE; SCATTERING; Science & Technology - Other Topics; SPECTRA; SPECTROSCOPY; SURFACE-ENHANCED RAMAN | Erscheinungsdatum: | 2009 | Herausgeber: | AMER CHEMICAL SOC | Journal: | NANO LETTERS | Volumen: | 9 | Ausgabe: | 6 | Startseite: | 2384 | Seitenende: | 2389 | Zusammenfassung: | Up to now, little effort has been made to exploit large-area high-throughput patterning by block copolymer (BCP) lithography to generate nanostructured substrates with periods well below 100 nm for surface-enhanced Raman scattering (SERS). We show that simple BCP-templated galvanic displacement reactions yield dense arrays of mushroom-shaped gold nanopillars with a period of 50 nm. The nanoporous BCP films used as templates were obtained by swelling-induced reconstruction of reverse micelle monolayers deposited on silicon wafers. Coupling of adjacent mushroom caps almost impinging on each other combined with their strong local curvature results in a high spatial density of hot spots in the narrow gaps between them. Thus, substrates characterized by high SERS efficiencies are obtained. |
ISSN: | 15306984 | DOI: | 10.1021/nl900939y |
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geprüft am 10.05.2024