Abstract
Gold nanoparticles (Au-NPs) were prepared by a surfactant-free single-phase reduction of hydrogen tetrachloroaurate(III) hydrate in the presence of different organic thiol ligands. Sizes, size distributions, and crystallinity of the Au-NPs were determined by high-resolution transmission electron microscopy and powder X-ray diffraction, whereas thermogravimetric analysis provided information on the organic ligand-to-gold ratios as well as amounts of contaminants. A systematic decrease in size with increasing conical bulk of the thiolate ligand is observed but large size distributions and contamination of the generated Au-NPs prohibit detailed mechanistic studies. A first-generation Fréchet dendron thiol produced the smallest and cleanest Au-NPs of the narrowest size distribution.
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Acknowledgements
The authors thank the National Science and Engineering Research Council (NSERC) of Canada, the Canadian Foundation for Innovation (CFI), the Ontario Innovation Trust (OIT), the Ontario Centres of Excellence (OCE), and Barrick Gold for funding. McLachlan thanks NSERC for undergraduate summer research awards (USRA). We are also grateful to Fred Pearson at McMaster University for TEM measurements.
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Jia, W., McLachlan, J., Xu, J. et al. Size and purity of gold nanoparticles changes with different types of thiolate ligands. J Therm Anal Calorim 100, 839–845 (2010). https://doi.org/10.1007/s10973-010-0711-2
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DOI: https://doi.org/10.1007/s10973-010-0711-2