Gold Nanolenses Self-Assembled by DNA Origami

Nanolenses are self-similar chains of metal nanoparticles, which can theoretically provide extremely high field enhancements. Yet, the complex structure renders their synthesis challenging and has hampered closer analyses so far. Here, DNA origami is used to self-assemble 10, 20, and 60 nm gold nano...

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Bibliographic Details
Published inACS photonics Vol. 4; no. 5; pp. 1123 - 1130
Main Authors Heck, Christian, Prinz, Julia, Dathe, André, Merk, Virginia, Stranik, Ondrej, Fritzsche, Wolfgang, Kneipp, Janina, Bald, Ilko
Format Journal Article
LanguageEnglish
Published American Chemical Society 17.05.2017
Subjects
nanolenses
DNA origami
plasmonics
SERS
gold nanoparticles
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Summary:Nanolenses are self-similar chains of metal nanoparticles, which can theoretically provide extremely high field enhancements. Yet, the complex structure renders their synthesis challenging and has hampered closer analyses so far. Here, DNA origami is used to self-assemble 10, 20, and 60 nm gold nanoparticles as plasmonic gold nanolenses (AuNLs) in solution and in billions of copies. Three different geometrical arrangements are assembled, and for each of the three designs, surface-enhanced Raman scattering (SERS) capabilities of single AuNLs are assessed. For the design which shows the best properties, SERS signals from the two different internal gaps are compared by selectively placing probe dyes. The highest Raman enhancement is found for the gap between the small and medium nanoparticle, which is indicative of a cascaded field enhancement.
ISSN:2330-4022
2330-4022
DOI:10.1021/acsphotonics.6b00946