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Synthesis of Core-Shell Gold Nanoparticles with Maltose-Modified Poly(Ethyleneimine)

  • The synthesis of ultrafine gold nanoparticles in presence of maltose-modified hyperbranched poly(ethyleneimines) (PEI) is described. The polymer acted as both a reducing and stabilising agent in the particle formation process. The nanoparticles were characterized by means of dynamic light scattering (DLS), transmission electron microscopy (TEM), analytical ultracentrifugation (AUC), small-angle x-ray scattering (SAXS), and small-angle neutron scattering (SANS). The mechanism of nanoparticle formation can be described in two steps. The reduction process of the Au3+ ions located in the inner coil region of the hyperbranched PEI led to the formation of a compact gold core, and is accompanied by a collapse of the polymer coil. Therefore, in the subsequent reduction process a gold-polymer hybrid shell is formed. By using the PEI of higher molar mass, core-shell gold nanoparticles of about 3.6 nm size with a more narrow size distribution and special fluorescence behavior could be synthesized.

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Author:Anja Koeth, Brigitte Tiersch, Dietmar Appelhans, Michael Gradzielski, Helmut CölfenGND, Joachim KoetzORCiDGND
ISSN:0193-2691 (print)
Parent Title (English):Journal of dispersion science and technology
Publisher:Taylor & Francis Group
Place of publication:Philadelphia
Document Type:Article
Year of first Publication:2012
Year of Completion:2012
Release Date:2017/03/26
Tag:Gold nanoparticles; gold-polymer hybrid shell; maltose-modified poly(ethyleneimine)
First Page:52
Last Page:60
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Peer Review:Referiert