Tunable Self-assembly of Au-nanoparticles with Near-Perfect Monodispersity

Details Tunable Self-assembly of Au-nanoparticles with Near-Perfect Monodispersity Tunable Self-assembly of Au-nanoparticles with Near-Perfect Monodispersity

2006-03-29

arxiv.org/abs/cond-mat/0603785v1

Physics

Condensed Matter

Materials Science

10 pages, 3 Figures

Scientific paper

Au nanoparticles with near perfect monodispersity in shape and size self-assemble, very slowly and at room temperature, on polystyrene films for film thickness < 4R_{g}$, R_{g} being unperturbed polymer gyration radius. Nanoparticle shape and size can be tuned, without sacrificing monodispersity, by changing polymer film thickness. Self-assembly is caused by enhanced two-dimensional diffusion of sputter-deposited Au clusters on a distribution of surface energy variations, sharply defined and with tunable dimensions, corresponding to low cohesion between gyration spheres on film surface. Lowering of cohesion and enhanced surface diffusion are clearly related to confinement-induced gyration sphere layering along film depth.

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