Optical and topological characterization of gold nanoparticle dimers linked by a single DNA double strand.
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.
Institut Langevin, ESPCI ParisTech, CNRS UMR 7587, INSERM U979, 10 rue Vauquelin, 75005 Paris, France.
Mickaël P
MP
Busson
Brice
B
Rolly
Brian
B
Stout
Nicolas
N
Bonod
Eric
E
Larquet
Albert
A
Polman
Sébastien
S
Bidault
D003198:Computer Simulation; D004247:DNA / Q000737:chemistry*; D019281:Dimerization; D006046:Gold / Q000737:chemistry*; D008422:Materials Testing; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D012031:Refractometry
D006046:Gold; D004247:DNA