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Science 13 April 2007:
Vol. 316. no. 5822, pp. 261 - 264
DOI: 10.1126/science.1139131
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Reports

Plastic and Moldable Metals by Self-Assembly of Sticky Nanoparticle Aggregates

Rafal Klajn,1* Kyle J. M. Bishop,1* Marcin Fialkowski,1 Maciej Paszewski,1 Christopher J. Campbell,1 Timothy P. Gray,2 Bartosz A. Grzybowski1,2{dagger}

Deformable, spherical aggregates of metal nanoparticles connected by long-chain dithiol ligands self-assemble into nanostructured materials of macroscopic dimensions. These materials are plastic and moldable against arbitrarily shaped masters and can be thermally hardened into polycrystalline metal structures of controllable porosity. In addition, in both plastic and hardened states, the assemblies are electrically conductive and exhibit Ohmic characteristics down to ~20 volts per meter. The self-assembly method leading to such materials is applicable both to pure metals and to bimetallic structures of various elemental compositions.

1 Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA.
2 Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.

* These authors contributed equally to this work.

{dagger} To whom correspondence should be addressed. E-mail: grzybor{at}northwestern.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)