Journal
NANO LETTERS
Volume 11, Issue 11, Pages 5060-5065Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2032052
Keywords
Nanoparticle dimers; plasmon coupling; DNA self-assembly; cryo-electron microscopy; darkfield microscopy; Mie theory
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Funding
- CNRS
- Agence Nationale de la Recherche [ANR 11 BS10 002 02]
- NWO
- Dutch ministry of Economic Affairs
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We demonstrate that symmetric or asymmetric gold nanoparticle dimers with substantial scattering cross sections and plasmon coupling can be produced with a perfectly controlled chemical environment and a high purity using a single DNA linker as short as 7 nm. A statistical analysis of the optical properties and morphology of single dimers is performed using darkfield and cryo-electron microscopies. These results, correlated to Mie theory calculations, indicate that the particle dimers are stretched in water by electrostatic interactions.
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