Alternating voltage-induced electrochemical synthesis of colloidal Au nanoicosahedra
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A simple method of alternating voltage-induced electrochemical synthesis has been developed to synthesize highly dispersed colloidal Au nanoicosahedra of 14 ± 3 nm in size. This simple and effective method uses a common transformer to apply a zero-offset alternating voltage to a pair of identical Au electrodes that are immersed in an electrolyte solution containing ligands. The obtained Au nanoicosahedra in this work are among the smallest Au icosahedra synthesized in aqueous solutions. A series of experimental conditions have been studied, such as voltage, the electrolyte identity and concentration, stabilizer identity and concentration, and reaction temperature. The mechanistic study indicates that Au nanoicosahedra are produced on electrode surfaces through an intermediate state of AuO x . The kinetic rate constant of these Au icosahedra in catalyzing the reduction of 4-nitrophenol with sodium borohydride is found much larger than the literature values of similar Au nanocrystals. In addition, the synthesis of Au–Pd-alloyed NCs has also been attempted.
KeywordsColloidal nanocrystals Electrochemical synthesis Gold Icosahedra Minerals processing
This material is based upon work supported by the Startup Fund for YY from the Colorado School of Mines.
- Bard AJ, Faulkner LR (2001) Electrochemical methods: fundamentals and applications, 2nd edn. Wiley, New YorkGoogle Scholar
- Henning AM, Watt J, Miedziak PJ, Cheong S, Santonastaso M, Song MH, Takeda Y, Kirkland AI, Taylor SH, Tilley RD (2013) Gold–palladium core–shell nanocrystals with size and shape control optimized for catalytic performance. Angew Chem Int Ed 52(5):1477–1480. doi: 10.1002/anie.201207824 CrossRefGoogle Scholar
- Huang CC, Lai WC, Tsai CY, Yang CH, Yeh CS (2012) Reversible synthesis of Sub-10 nm spherical and icosahedral gold nanoparticles from a covalent Au(CN)2-precursor and recycling of cyanide to form ferric ferrocyanide for cell staining. Chemistry 18(13):4107–4114. doi: 10.1002/chem.201103024 CrossRefGoogle Scholar
- Hughes MD, Xu YJ, Jenkins P, McMorn P, Landon P, Enache DI, Carley AF, Attard GA, Hutchings GJ, King F, Stitt EH, Johnston P, Griffin K, Kiely CJ (2005) Tunable gold catalysts for selective hydrocarbon oxidation under mild conditions. Nature 437(7062):1132–1135. doi: 10.1038/nature04190 CrossRefGoogle Scholar
- Liu J, Huang W, Chen S, Hu S, Liu F, Li ZL (2009) Facile electrochemical dispersion of bulk Rh into hydrosols. Int J Electrochem Sci 4(9):1302–1308Google Scholar
- Turova N (2011) Inorganic chemistry in tables, vol IV. English translation of the Russian edition (Vissh. Khim. Kolledzh Rus. Acad. Nauk), MMCME, Moscow Center For Continuous Mathematical Education, 2009, ISBN 978-5-94057-451-4. Springer, Moscow. doi: 10.1007/978-3-642-20487-6