Methods of controlling nanoparticle growth

C - Chemistry – Metallurgy – 22 – F

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C22F 3/00 (2006.01)

Patent

CA 2521251

The invention provides new types of plasmon-driven growth mechanism for silver nanostructures involving the fusion of triangular nanoprisms. This mechanism, which is plasmon excitation-driven and highly cooperative, produces bimodal particle size distributions. In these methods, the growth process can be selectively switched between bimodal and unimodal distributions using dual beam illumination of the nanoparticles. This type of cooperative photo-control over nanostructure growth enables synthesis of monodisperse nanoprisms with a preselected edge length in the 30-120 nm range simply by using one beam to turn off bimodal growth and the other (varied over the 450-700 nm range) for controlling particle size.

L'invention porte sur de nouveaux types de mécanismes d'étirement commandé par le plasmon pour des nanostructures en argent impliquant la fusion de nanoprismes triangulaires. Ce mécanisme, qui est commandé par excitation du plasmon et hautement coopératif, produit des distributions granulométriques bimodales. Dans ces procédés, le processus d'étirement peut être sélectivement commuté entre des distributions bimodales et unimodales par éclairage à double faisceau des nanoparticules. Ce type de photo-commande coopérative sur l'étirement d'une nanostructure permet la synthèse de nanoprismes monodispersés avec une longueur marginale présélectionnée comprise entre 30 et 120 nm simplement en utilisant un faisceau pour arrêter l'étirement bimodal et l'autre (variant entre 450 et 700 nm) pour contrôler la grosseur des particules.

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