Serial Silver Clusters Biomineralized by One Peptide

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• 作者：Yanyan Cui ; Yaling Wang ; Ru Liu ; Zhipeng Sun ; Yueteng Wei ; Yuliang Zhao ; Xueyun Gao
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：November 22, 2011
• 年：2011
• 卷：5
• 期：11
• 页码：8684-8689
• 全文大小：876K
• 年卷期：0
• ISSN：1936-086X

文摘

The artificial peptide with amino acid sequence CCYRGRKKRRQRRR was used to biomineralize serial Ag clusters. Under different alkaline conditions, clusters with red and blue emission were biomineralized by the peptide, respectively. The matrix-assisted laser desorption/ionization time-of-flight mass spectra implied that the red-emitting cluster sample was composed of Ag₂₈, while the blue-emitting cluster sample was composed of Ag₅, Ag₆, and Ag₇. The UV–visible absorption and infrared spectra revealed that the peptide phenol moiety reduced Ag⁺ ions and that formed Ag clusters were captured by peptide thiol moieties. The phenol reduction potential was controlled by the alkalinity and played an important role in determining the Ag cluster size. Circular dichroism observations suggested that the alkalinity tuned the peptide secondary structure, which may also affect the Ag cluster size.