Metal nanoparticle - block copolymer composite assembly and disassembly

Z.H. Li, H. Sai, S.C. Warren, M.M.G. Kamperman, H. Arora, S.M. Gruner, U. Wiesner

Research output: Contribution to journalArticleAcademicpeer-review

45 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)5578-5584
JournalChemistry of materials
Volume21
Issue number23
DOIs
Publication statusPublished - 2009

Keywords

  • separated diblock copolymers
  • mesoporous molecular-sieves
  • lyotropic liquid-crystals
  • gold nanoparticles
  • thiol monolayer
  • hybrid
  • silica
  • mesophases
  • location
  • mixtures

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