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Metal Nanoparticle−Block Copolymer Composite Assembly and Disassembly

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Zihui Li^†‡, Hiroaki Sai^†§, Scott C. Warren‡, Marleen Kamperman§, Hitesh Arora

, Sol M. Gruner#

and Ulrich Wiesner*§

^‡ Department of Chemistry and Chemical Biology

^§ Department of Materials Science and Engineering

School of Chemical and Bimolecular Engineering

^# Department of Physics

Cornell High Energy Synchrotron Source (CHESS)

Cornell University, Ithaca, New York 14853

Chem. Mater., 2009, 21 (23), pp 5578–5584

DOI: 10.1021/cm9020673

Publication Date (Web): November 6, 2009

*To whom correspondence should be addressed. E-mail address: ubw1@cornell.edu., †

These authors contributed equally to this work

Section:

Plastics Fabrication and Uses

Abstract

Ligand-stabilized platinum nanoparticles (Pt NPs) were self-assembled with poly(isoprene-block-dimethylaminoethyl methacrylate) (PI-b-PDMAEMA) block copolymers to generate organic−inorganic hybrid materials. High loadings of NPs in hybrids were achieved through usage of N,N-di-(2-(allyloxy)ethyl)-N-3-mercaptopropyl-N-methylammonium chloride as the ligand, which provided high solubility of NPs in various solvents as well as high affinity to PDMAEMA. From NP synthesis, existence of subnanometer Pt NPs was confirmed by high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) images. Estimations of the Pt NP ligand headgroup density based on HAADF-STEM images and thermogravimetric analysis (TGA) data yielded results comparable to what has been found for alkanethiol self-assembled monolayers (SAMs) on flat Pt {111} surfaces. Changing the volume fraction of Pt NPs in block copolymer−NP composites yielded hybrids with spherical micellar, wormlike micellar, lamellar, and inverse hexagonal morphologies. Disassembly of hybrids with spherical, wormlike micellar, and lamellar morphologies generated isolated metal NP−based nanospheres, cylinders, and sheets, respectively. Results suggest the existence of powerful design criteria for the formation of metal-based nanostructures from designer blocked macromolecules.

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