Journal
NANO LETTERS
Volume 12, Issue 8, Pages 4380-4384Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl3021957
Keywords
Gold nanoparticles; dumbbells; self-assembly; interparticle interactions; steric hindrance
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Funding
- Spanish MINECO [MAT2010-15374]
- EU (NANODIRECT) [CP-FP 213948-2]
- Juan de la Cierva Fellowship from the Spanish MINECO
- Flemish Fund for Scientific Research-Flanders
- European Union under the Framework 7 program under Integrated Infrastructure Initiative [262348 ESMI]
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In the formation of colloidal molecules, directional interactions are crucial for controlling the spatial distribution of the building blocks. Anisotropic nanoparticles facilitate directional clustering via steric constraints imposed by each specific shape, thereby restricting assembly along certain directions. We show in this Letter that the combination of patchiness (attraction) and shape (steric hindrance) allows assembling gold nanodumbbell building blocks into crosslike dimers with well-controlled interparticle distance and relative orientation. Steric hindrance between interacting dumbbell-like particles opens up a new synthetic approach toward low-symmetry plasmonic clusters, which may significantly contribute to understand complex plasmonic phenomena.
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