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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Rettz M. T.; W. Helbig; Quaiser S. A.; Stimming U.; Breuer N.; Vogel R. Science 1995, 267, 367–369.
Moffitt M.; Eisenberg A. Chemistry of Materials 1995, 7, 1178–.
Forster S. Ber. Bunsenges. Phys. Chem. 1997, 101, 1671–1678.
Antonietti M.; Thunemann A.; Wenz E. Colloid Polymer Science 1996, 274, 795–800.
Antonietti M.; Heinz S.; Schmidt M.; Rosenauer C. Macromolecules 1994, 27, 3276–2381.
Mayer A. B. R.; Mark J. E. Colloid Polymer Science 1997, 275.
Moller M.; Lenz R. W. Makromol Chemistry 1989, 190, 1153–0068.
Chan Y. N.C.; Craig G. S. W.; Schrock R.R.; Cohen R. E. Chemistry of Materials 1992, 4, 885–894.
Cummins C. C.; Schrock R. R.; Cohen R. E. Chemistry of Materials 1992, 4, 27–30.
Sankaran V.; Cummins C.C.; Schrock R. R.; Cohen R. E.; Silbey R. J. Journal of the American Chemical Society 1990, 112, 6858–6859.
Yue J.; Cohen R. E. Supramolecular Science 1994, 1, 117–122.
Yue J.; Sankaran V.; Cohen R. E.; Schrock R. R. Journal of the American Chemical Society 1993, 115, 4409–4410.
Ciebien J. F.; Clay R. T.; Sohn B. H.; Cohen R. E. New Journal of Chemistry 1998, 23, 685–691.
Ciebien J. F.; Cohen R. E.; Duran A. Supramolecular Science 1998,5,31–39.
Watkins J. J.; McCarthy T. J. Macromolecules 1995, 28, 4067–4074.
Berens A. R.; Huvard G. S.; Richard W. K.; Kunig F. W. Journal of Applied Polymer Science 1992, 46, 231–242.
Chapman B. R.; Gochanour C. R.; Paulaitis M. E. Macromolecules 1996, 29, 5635.
Vogt B. D.; Brown G. D.; RamachandraRao V. S.; Watkins J. J. Macromolecules 1999, 32, 7907–7912.
Watkins J. J.; Brown G. D.; RamachandraRao V. S.; Pollard M. A.; Russell T. P. Macromolecules 1999, 32, 7737–7740.
Acknowledgments
We thank Dr. Steve Smith at Procter & Gamble for the synthesis of the PS-b-PAA. Support from the Procter and Gamble Company (University Exploratory Research Program), the David and Lucile Packard Foundation and the Materials Research Science and Engineering Center at the University of Massachusetts is gratefully acknowledged.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Brown, G.D., Watkins, J.J. Carbon Dioxide–Dilated Block Copolymer Templates for Nanostructured Materials. MRS Online Proceedings Library 584, 169–174 (1999). https://doi.org/10.1557/PROC-584-169
Published:
Issue Date:
DOI: https://doi.org/10.1557/PROC-584-169