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Title: Scalable and precise synthesis of thiolated Au10-12, Au 15, Au18, and Au25 nanoclusters via pH controlled CO reduction
Authors: Yu, Y.
Chen, X.
Yao, Q.
Yu, Y.
Yan, N.
Xie, J. 
Keywords: CO reduction
gold nanoclusters
large scale synthesis
pH-dependent redox potential
size tunable
Issue Date: 26-Mar-2013
Citation: Yu, Y., Chen, X., Yao, Q., Yu, Y., Yan, N., Xie, J. (2013-03-26). Scalable and precise synthesis of thiolated Au10-12, Au 15, Au18, and Au25 nanoclusters via pH controlled CO reduction. Chemistry of Materials 25 (6) : 946-952. ScholarBank@NUS Repository.
Abstract: Large-scale production of thiolated Au nanoclusters (NCs) of tunable sizes is pivotal to realizing their practical applications. Here, we present a simple one-pot synthesis method for gram-scale production of various discrete-sized Au NCs (Au10-12, Au15, Au18, and Au25) protected by different thiol ligands. The key design in our method is to use a gaseous reducing agent, carbon monoxide (CO), to support a mild reaction environment for a slow and well-controlled growth of Au NCs. The pH of the reaction solution was further used to fine-tune the reduction kinetics for the NC growth, leading to the formation of various sized Au NCs. The monodispersity of our products was verified by a number of characterization techniques (e.g., UV-vis, electrospray ionization (ESI)-MS, and X-ray photoelectron spectroscopy (XPS)). NMR spectroscopy was also used to investigate the structure of as-synthesized thiolated Au NCs, which suggested that Au18(SG) 14 NCs adopt a core-shell structure with two binding modes of the thiol ligands. The synthetic strategy developed in this study produced three small thiolated Au NCs (Au10-12, Au15, and Au 18) in large quantities that are not available in the current NC synthesis due to the lack of direct and scalable synthetic protocols. © 2013 American Chemical Society.
Source Title: Chemistry of Materials
ISSN: 08974756
DOI: 10.1021/cm304098x
Appears in Collections:Staff Publications

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