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Science 13 October 2006:
Vol. 314. no. 5797, pp. 274 - 278
DOI: 10.1126/science.1128045
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Reports

Self-Assembly of CdTe Nanocrystals into Free-Floating Sheets

Zhiyong Tang,1* Zhenli Zhang,1 Ying Wang,2 Sharon C. Glotzer,1,2{dagger} Nicholas A. Kotov1,2,3{dagger}

In their physical dimensions, surface chemistry, and degree of anisotropic interactions in solution, CdTe nanoparticles are similar to proteins. We experimentally observed their spontaneous, template-free organization into free-floating particulate sheets, which resemble the assembly of surface layer (S-layer) proteins. Computer simulation and concurrent experiments demonstrated that the dipole moment, small positive charge, and directional hydrophobic attraction are the driving forces for the self-organization process. The data presented here highlight the analogy of the solution behavior of the two vastly different classes of chemical structures.

1 Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109–2136, USA.
2 Department of Materials Science and Engineering, University of Michigan, Ann Arbor, MI 48109–2136, USA.
3 Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109–2136, USA.

* Present address: National Center for Nanoscience and Technology, Beijing 100080, China.

{dagger} To whom correspondence should be addressed. E-mail: kotov{at}umich.edu (N.A.K.); sglotzer{at}umich.edu (S.C.G.)

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Micro- and nanoparticles self-assembly for virtually defect-free, adjustable monolayers.
N. Aubry, P. Singh, M. Janjua, and S. Nudurupati (2008)
PNAS 105, 3711-3714
   Abstract »    Full Text »    PDF »
Formation of Tellurium Nanocrystals during Anaerobic Growth of Bacteria That Use Te Oxyanions as Respiratory Electron Acceptors.
S. M. Baesman, T. D. Bullen, J. Dewald, D. Zhang, S. Curran, F. S. Islam, T. J. Beveridge, and R. S. Oremland (2007)
Appl. Envir. Microbiol. 73, 2135-2143
   Abstract »    Full Text »    PDF »


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