Extremely high stability of glutathionate-protected Au25 clusters against core etching

被引：355

作者：

Shichibu, Yukatsu

Negishi, Yuichi

Tsunoyama, Hironori

Kanehara, Masayuki

Teranishi, Toshiharu

Tsukuda, Tatsuya ^{[1
]}

机构：

[1] Inst Mol Sci, Res Ctr Mol Scale Nanosci, Myodaiji, Okazaki 4448585, Japan

[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan

[3] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

来源：

SMALL | 2007年 / 3卷 / 05期

关键词：

clusters; core/shell materials; etching; glutathione; gold;

D O I：

10.1002/smll.200600611

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The etching reactivity of glutathionate (SG) protected Au n(SG)m clusters, where (n,m)=(10,10), (15,13), (18, 14), (22,16), (25,18), (29,20), (33, 22), and (39, 24) by free glutathione (GSH) under aerobic condition, was analyzed. It was observed that the colors of the solution of smaller Aun(SG)m cluster (core size n<25) faded after the addition of free GSH and became cloudy after three hours, while those for larger clusters (n≥25) did not exhibited appreciable color changes. The Au25(SG)18 and Au39(SG)25 showed the highest stability during storage in water for two weeks at ambient temperature. The high stability of Au25(SG)18 against core etching was contributed by chemical inertness arising from full protection by the SG ligands.

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页码：835 / 839

页数：5

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