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Science 27 June 2008:
Vol. 320. no. 5884, pp. 1748 - 1752
DOI: 10.1126/science.1159950
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Reports

Ordered Mesoporous Materials from Metal Nanoparticle–Block Copolymer Self-Assembly

Scott C. Warren,1,2 Lauren C. Messina,2 Liane S. Slaughter,2 Marleen Kamperman,1 Qin Zhou,2 Sol M. Gruner,3 Francis J. DiSalvo,2 Ulrich Wiesner1*

The synthesis of ordered mesoporous metal composites and ordered mesoporous metals is a challenge because metals have high surface energies that favor low surface areas. We present results from the self-assembly of block copolymers with ligand-stabilized platinum nanoparticles, leading to lamellar CCM-Pt-4 and inverse hexagonal (CCM-Pt-6) hybrid mesostructures with high nanoparticle loadings. Pyrolysis of the CCM-Pt-6 hybrid produces an ordered mesoporous platinum-carbon nanocomposite with open and large pores (≥10 nanometers). Removal of the carbon leads to ordered porous platinum mesostructures. The platinum-carbon nanocomposite has very high electrical conductivity (400 siemens per centimeter) for an ordered mesoporous material fabricated from block copolymer self-assembly.

1 Department of Materials Science and Engineering, Cornell University, Ithaca, NY 14853, USA.
2 Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
3 Department of Physics, Cornell University, Ithaca, NY 14853, USA.

* To whom correspondence should be addressed. E-mail: ubw1{at}cornell.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Single Nanocrystals of Platinum Prepared by Partial Dissolution of Au-Pt Nanoalloys.
M. Schrinner, M. Ballauff, Y. Talmon, Y. Kauffmann, J. Thun, M. Moller, and J. Breu (2009)
Science 323, 617-620
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Science. ISSN 0036-8075 (print), 1095-9203 (online)