Controlled etching of Au:SR cluster compounds

被引:223
作者
Schaaff, TG
Whetten, RL
机构
[1] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA
[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA
来源
JOURNAL OF PHYSICAL CHEMISTRY B | 1999年 / 103卷 / 44期
关键词
D O I
10.1021/jp993229d
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
When Au:SR cluster compounds (R = (CH2)(5)CH3) with an Au metallic cluster core mass of similar to 14 kDa (similar to 75 atoms, 1.1 nm equivalent diameter), are heated in neat dodecane-thiol solution under inert atmosphere, species with smaller Au core masses are formed, presumably by the removal of Au atoms from the outermost surface layer of the cluster's Au core. This process was monitored through laser desorption mass spectrometry, optical absorption spectroscopy, and X-ray diffraction, where all three methods indicate a substantial decrease (>50%, by mass or number of Au atoms) in the size of the cluster compound's inorganic core. The optical absorption spectra and laser desorption mass spectra of the compounds generated by etching are strikingly similar to compounds previously separated without an etching step. The dual function of the thiol as both stabilizing adsorbate and efficient etchant sets this cluster (or nanocrystal) system apart from other metallic and semiconductor systems.
引用
收藏
页码:9394 / 9396
页数:3
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