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Eugenia Kumacheva: "Self-assembly of inorganic nanorods: a block copolymer paradigm"

Wann 17.09.2009
von 11:15 bis 12:15
Wo FRIAS Seminarraum, Alberstraße 19
Kontakttelefon +49 (761) 203 97418
Teilnehmer Universitäts öffentlich
Termin übernehmen vCal

Professor Eugenia Kumacheva
Department of Chemistry, University of Toronto, Canada


Self-assembly of inorganic nanorods: a block copolymer paradigm

Organized arrays of anisotropic nanoparticles (nanorods) show electronic and optical properties that originate from the coupling of shape-dependent properties of the individual nanorods. The organization of nanorods in a controllable predictable way provides a route to the fabrication of new materials and functional devices. Significant progress has been achieved in the self-assembly of nanorod arrays, yet the realization of different structures requires the change in the surface chemistry of the nanoparticles.

We developed a block copolymer approach to the self-assembly of metal nanorods by using a striking analogy between amphiphilic ABA triblock copolymers and the hydrophilic nanorods tethered with hydrophobic polymer molecules at both ends. The self-assembly was achieved solely by changing the solvent quality for the constituent blocks. The structures were mapped on the phase-like diagrams. The approach was extended to photothermally triggered self-assembly and to the utilization of conductive polymers. We achieved control over the optical properties of the self-assembled structures. This work provides a new route to the organization of anisotropic nanoparticles by using the strategies that are established for the self-assembly of block copolymers.