Formation of Stable Ag-Nanoparticle Aggregates Induced by Dithiol Cross-Linking

Formation of Stable Ag-Nanoparticle Aggregates Induced by Dithiol Cross-Linking

Aggregation of thiol-stabilized silver nanoparticles induced by 1,6-hexane dithiol was studied in situ by dynamic light scattering. The aggregates were observed to reach a finite size in the 100−200 nm range depending on the applied conditions. Growth kinetics were shown to be linked to the dynamics...

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Veröffentlicht in:The journal of physical chemistry. B 2006-07, Vol.110 (26), p.12954-12958
Hauptverfasser: Ahonen, Päivi, Laaksonen, Timo, Nykänen, Antti, Ruokolainen, Janne, Kontturi, Kyösti
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container_issue 26
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container_title The journal of physical chemistry. B
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creator Ahonen, Päivi
Laaksonen, Timo
Nykänen, Antti
Ruokolainen, Janne
Kontturi, Kyösti
description Aggregation of thiol-stabilized silver nanoparticles induced by 1,6-hexane dithiol was studied in situ by dynamic light scattering. The aggregates were observed to reach a finite size in the 100−200 nm range depending on the applied conditions. Growth kinetics were shown to be linked to the dynamics of the thiol-exchange reaction. A model for the aggregation process was developed on the basis of a simple diffusion-kinetic approach assuming an elementary kinetic reaction at the surfaces and a spherical diffusion field surrounding the aggregates. The rate constant for the thiol exchange reaction was found to vary between 0.6 and 4.0 × 10-4 s-1, and the activation energy was 46 ± 10 kJ mol-1.
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title Formation of Stable Ag-Nanoparticle Aggregates Induced by Dithiol Cross-Linking
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