期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 121, 期 14, 页码 8002-8013出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b01424
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资金
- Sapienza University of Rome, Ateneo Sapienza [2015/C26A15H5J9, 2015/C26A15LRMA]
- European Union's Seventh Framework Programme for research, technological development, and demonstration under the NMI3-II Grant [283883]
Hydrophilic gold and silver nanoparticles stabilized with 2-diethylaminoethanethiol hydrochloride (DEA) have been prepared and characterized. AuNPs-DEA and AgNPs-DEA with mean diameter below 10 nm have been characterized by means of dynamic light scattering and field emission scanning electron microscopy techniques. Nuclear magnetic resonance (NMR) studies allowed to assess translational mobility, aggregation equilibrium in function of pH variations and presence of chemisorbed and physisorbed thiol molecules; in particular ethyl groups on DEA ligands are free to rotate, suggesting a rather loose packing of the thiols on the nanopartide surface. NMR results were compared with X-ray photoelectron spectroscopy, near-edge X-ray absorption fine structure, and X-ray absorption spectroscopy. The complementary information acquired allowed to obtain information on the interaction at the interface between the organic thiol ligand and metal nanopartides (NPs) at atomic level as well as on the molecular structure. The influence of the thickness of the functionalizing layer on the stability of NPs has been studied and opened new insight on the local structure surrounding the NPs.
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