Scalable and Precise Synthesis of Thiolated Au10鈥?2, Au15, Au18, and Au25 Nanoclusters via pH Controlled CO Reduction

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• 作者：Yong Yu ; Xi Chen ; Qiaofeng Yao ; Yue Yu ; Ning Yan ; Jianping Xie
• 刊名：Chemistry of Materials
• 出版年：2013
• 出版时间：March 26, 2013
• 年：2013
• 卷：25
• 期：6
• 页码：946-952
• 全文大小：353K
• 年卷期：v.25,no.6(March 26, 2013)
• ISSN：1520-5002

文摘

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 (Au_10鈥?2, 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鈥搗is, 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鈥搒hell structure with two binding modes of the thiol ligands. The synthetic strategy developed in this study produced three small thiolated Au NCs (Au_10鈥?2, Au₁₅, and Au₁₈) in large quantities that are not available in the current NC synthesis due to the lack of direct and scalable synthetic protocols.

Keywords:

gold nanoclusters; CO reduction; pH-dependent redox potential; size tunable; large scale synthesis