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Carbon Dioxide – Dilated Block Copolymer Templates for Nanostructured Materials

Published online by Cambridge University Press:  10 February 2011

Garth D. Brown  and
James J. Watkins
Garth D. Brown
Affiliation:
Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003
James J. Watkins
Affiliation:
Department of Chemical Engineering, University of Massachusetts, Amherst, MA 01003
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Abstract

Periodic polymer/metal (Pt or Ag) and polymer/semiconductor (PbS) nanocomposites are prepared using block copolymers dilated with carbon dioxide (CO2) as templates. Specifically, organometallic compounds (metal precursors) are dissolved into supercritical CO2 and infused into polystyrene-block-poly(acrylic acid) or polystyrene-block-poly(vinylpyridine) copolymers. Upon infusion, the acid or pyridine block selectively binds the metal precursor. The excess is removed from the polystyrene phase by subsequent CO2 extraction. Reduction of the bound organometallic with hydrogen or hydrogen sulfide yields the desired metal or semiconductor clusters, which are confined to the precursor-binding domain and remain positioned on the copolymer lattice. The composites are characterized by transmission electron microscopy, x-ray scattering and electron diffraction.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 584 , 1999 , 169
Copyright
Copyright © Materials Research Society 2000

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