Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 399, Issue -, Pages 1-5Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.02.040
Keywords
Turkevich synthesis; Gold nanoparticles; Plasmon resonance; DOSY; NMR spectroscopy; Gold-citrate aggregates
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Funding
- FRIA
- Belgian FRS-FNRS
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The citrate reduction of gold(III) in water is one of the most commonly used synthetic pathways for the preparation of gold colloids. In order to gain insight into the formation of gold nanoparticles (GNPs) using this method, the synthesis of GNPs was undertaken under different experimental conditions and monitored in operando by UV-Vis spectroscopy. These experiments highlight that citrate should be polydeprotonated and that Au(III) should not be polyhydroxylated in order to obtain GNPs with a narrow size distribution. Samples taken during the reaction were also characterized by Nuclear Magnetic Resonance Spectroscopy (NMR) to monitor the various reaction products as a function of time. Diffusion Ordered SpectroscopY (DOSY) experiments allowed us to identify slow diffusing citrate - Au(I) or Au(O) complexes which could play a role in the formation of GNPs. (C) 2013 Elsevier Inc. All rights reserved.
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