Abstract
Nanocrystalline gold is electrodeposited from a stable nontoxic bath, in which Au+ is stabilized by complex formation with 3-mercapto-1-propanesulfonic acid sodium salt. Nanoscaling is achieved by pulse techniques. The crystallite size is strongly dependent on physical and chemical process parameters, such as pulse duration, current density, bath temperature, type, and amount of additives; especially, we observe a decrease of the crystallite size down to 16 nm by the proper choice of current density and temperature, and down to 7 nm by the use of additives. The thermal stability of nanocrystalline gold is investigated by in situ high-temperature X-ray diffraction; nanogold exhibits a thermal stability up to 673 K. An activation energy of 37 kJ mol−1 is determined for the grain-growth kinetics.
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Acknowledgments
The present work is initiated and performed at the Universität des Saarlandes (Germany) in the framework of the Sonderforschungsbereich 277 (Grenzflächenbestimmte Materialien). For experimental assistance, we thank S. Kuhn.
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Yevtushenko, O., Natter, H. & Hempelmann, R. Influence of bath composition and deposition parameters on nanostructure and thermal stability of gold. J Solid State Electrochem 11, 138–143 (2007). https://doi.org/10.1007/s10008-006-0212-1
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DOI: https://doi.org/10.1007/s10008-006-0212-1