Gold nanoparticles stabilized by thioether dendrimers
| Autor: | Marcel Mayor, Jens Peter Hermes, Damien Thompson, Thomas Pfohl, Torsten Peterle, Raphael Urbani, Fabian Sander |
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| Rok vydání: | 2011 |
| Předmět: |
Chemistry
Ligand Organic Chemistry Dispersity Nanoparticle Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Branching (polymer chemistry) 01 natural sciences Catalysis 0104 chemical sciences chemistry.chemical_compound Thioether Colloidal gold Transmission electron microscopy Dendrimer 0210 nano-technology |
| Zdroj: | Chemistry (Weinheim an der Bergstrasse, Germany). 17(48) |
| ISSN: | 1521-3765 |
| Popis: | Ligand-stabilized gold nanoparticles (Au NPs) are promising materials for nanotechnology with applications in electronics, catalysis, and sensors. These applications depend on the ability to synthesize stable and monodisperse NPs. Herein, the design and synthesis of two series of dendritic thioether ligands and their ability to stabilize Au NPs is presented. The dendrimers have 1,3,5-trisubstituted benzene branching units bridged by either meta-xylene or ethylene moieties. A comparison between the two ligands shows how both size control and the stability of the NPs are influenced by the nature of the ligand-NP wrapping interaction. The meta-xylene-bridged ligands provided NPs with a narrow size distribution centered around a diameter of 1.2?nm, whereas the NPs formed with ethylene-bridged dendrimers lack long-term stability with NP aggregation detected by UV/Vis spectroscopy and transmission electron microscopy. The bulkier tert-butyl-functionalized meta-xylene bridges form larger ligand shells that inhibit further growth of the NPs and thus provide a simple route to stable and monodisperse Au NPs that may find use as functional components in nanoelectronic devices. |
| Databáze: | OpenAIRE |
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