Ultra-long palladium nanoworms by polymer grafts

Titelangaben

Bokern, Stefan ; Volz, Kerstin ; Agarwal, Seema ; Greiner, Andreas:
Ultra-long palladium nanoworms by polymer grafts.
In: Journal of Nanoparticle Research. Bd. 14 (2012) Heft 8 . - 1041.
ISSN 1572-896X
DOI: https://doi.org/10.1007/s11051-012-1041-z

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Abstract

Chemically and morphologically stable, non-aggregating palladium nanoworms with diameters of 2 nm and lengths of up to 10 nm with a graft-to polystyrene shell were synthesized in a straight-forward one-phase system, and proof for the mechanism of formation is presented. The synthesis has been achieved by the application of omega-2,2'-bipyridyl-polystyrene as stabilizer, which led to a "graft-to'' structure of palladium nanoworms with polystyrene shell. The nanoworms have been characterized by TEM, XRD, and coupled GPC-UV/Vis measurement. It was possible to show that the formation of nanoworms proceeds by agglomeration of spherical palladium nanoparticles. This mechanism was transferred to omega-thiol-polystyrene as stabilizer, which results in either spherical nanoparticles (low ratio Pd:Polymer, <2 nm diameter) or high aspect ratio nanoworms (high ratio Pd: Polymer, up to 10 x 120 nm), proving that the formation of palladium nanoworms was not exclusive for pyridine/amine-based ligands.