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Phase Separation on Mixed-Monolayer-Protected Metal Nanoparticles: A Study by Infrared Spectroscopy and Scanning Tunneling Microscopy

Authors

  • Andrea Centrone Dr.,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, Fax: (+1) 617-324-2500
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  • Ying Hu Dr.,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, Fax: (+1) 617-324-2500
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  • Alicia M. Jackson,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, Fax: (+1) 617-324-2500
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  • Giuseppe Zerbi Prof.,

    1. Politecnico di Milano, Dip. Chimica, Materiali, Ing. Chimica “G. Natta”, P.za L. da Vinci 32, 20133 Milano, Italy
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  • Francesco Stellacci Prof.

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA, Fax: (+1) 617-324-2500
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  • This work was financially supported by the National Science Foundation (NIRT DMR-0303973). F.S. is grateful to the Packard Foundation, 3M, and DuPont for their young investigators awards. A.C. acknowledges support from the Rocca Foundation.

Abstract

original image

On the surface: Mixed monolayers, which on flat surfaces phase-separate into randomly shaped domains, spontaneously form ordered rings of alternating composition when assembled around the core of a monolayer-protected gold nanoparticle (see figure). It is shown that it is possible to use infrared spectroscopy, a simple and common technique, to prove the existence of these phase-separated domains on nanoparticles.

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