Authors Köth, A. ; Tiersch, B. ; Appelhans, D. ; Gradzielski, M. ; Cölfen, H. ; Koetz, J.
Title Synthesis of core shell gold nanoparticles with maltose-modified poly(ethyleneimine)
Date 01.01.2012
Abstract 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 characterised 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 behaviour could be synthesised.
Journal Journal of Dispersion Science and Technology 32 (2012) 52-60

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