Impact of the Crosslinker's Molecular Structure on the Aggregation of Gold Nanoparticles

Michael Deffner, Florian Schulz, Holger Lange
2017 Zeitschrift fur physikalische Chemie (Munchen. 1991)  
AbstractWe studied the aggregation of AuNP induced by small aromatic molecules under different conditions. In water, the aggregation was found to be difficult to control. Phase transfer of the particles into toluene by using oleylamine as a ligand allows for a more controlled and reliable synthesis. Using nonane-1,9-dithiol as a control, our experiments demonstrate that the molecular structure of the linker has a decisive influence on the aggregation. Aromatic dithiols yielded spherical
more » ... d spherical aggregates in the range of 100 nm, whereas the aliphatic linker produced large aggregates in the µm range. The length of the aromatic linker (2 vs. 3 phenylene units) strongly affected aggregation kinetics and the structure of the produced aggregates. With UV/Vis and DLS based experiments it was possible to distinguish the process of ligand layer formation and aggregation. Our results will help to develop syntheses of defined spherical aggregates and possibly more complex structures.
doi:10.1515/zpch-2016-0865 fatcat:xzytmh27zbd2jgdgzvjulssxbi