期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 557, 期 -, 页码 106-115出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2018.02.045
关键词
Gold nanoparticles; Chitosan; UV-vis spectroscopy; Atomic force microscopy; Transmission electron microscopy; Apparent activation energy
资金
- Horizon 2020 Materials Networking Project (H2020-TWINN-2015-Twinning)
- Alexander von Humboldt Foundation [BG05M2OP001-2.009-0028]
In this work colloidal gold nanoparticles (GNPs) are prepared using a citrate-reduction route, in which citric acid serves as reductive agent for the gold precursor HAuCl4. We demonstrate that a temperature variation on the one hand enables to tune the reaction rate of GNP formation and on the other hand allows modifying the morphology of the resulting metal nanoparticles. The use of chitosan, a biocompatible and biodegradable polymer with a multitude of functional amino and hydroxyl groups, facilitates the simultaneous synthesis and surface modification of GNPs in one pot. The resulting GNPs, which are stabilized by a network of chitosan and beta-ketoglutaric acid units, are characterized by UV-vis spectroscopy, atomic force microscopy (AFM), transmission electron microscopy (TEM) as well as fluorescence correlation spectroscopy (FCS) and reveal an average diameter of about 10 nm at the end of the synthesis. The kinetics of GNP formation is studied by calculating activation parameters based on UV-vis and AFM data such as the apparent activation energy, entropy and free energy applying the concept of the Finke-Watzky model and harmonic transition state theory.
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