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Size Dependence on Preparation Temperature of Thiol-Coated Gold Nanoparticles Determined by SAXS

K. Erlacher, J.M. Jørgensen, J.S. Pedersen, K.V. Gothelf
Bruker-AXS Inc., US

Keywords:
SAXS, colloids, nano particle

Abstract:
Monolayer protected gold colloids were synthesized by the Schiffrin procedure, with fixed amounts of the reactants but at various temperatures. It was expected that the colloids become bigger at elevated preparation temperatures. In order to extend the temperature range in which the colloids can be synthesized, three different methods of synthesizing the colloids in the absence of water were carried out. The presence and the sizes of the colloids can be ideally analyzed using the method of small-angle x-ray scattering (SAXS). A laboratory SAXS system (NanoSTAR) consisting of Goebel Mirrors, three pinhole collimation and a 2 Dimensional detector (Bruker AXS Inc.) was used for these experiments. A clear trend towards bigger colloid sizes at elevated temperatures was obtained.

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