Acoustic Vibration Modes and Electron–Lattice Coupling in Self-Assembled Silver Nanocolumns

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• 作者：J. Burgin ; P. Langot ; A. Arbouet ; J. Margueritat ; J. Gonzalo ; C. N. Afonso ; F. Vallé ; e ; A. Mlayah ; M. D. Rossell ; G. Van Tendeloo
• 刊名：Nano Letters
• 出版年：2008
• 出版时间：May 2008
• 年：2008
• 卷：8
• 期：5
• 页码：1296 - 1302
• 全文大小：846K
• 年卷期：v.8,no.5(May 2008)
• ISSN：1530-6992

文摘

Using ultrafast spectroscopy, we investigated electron–lattice coupling and acoustic vibrations in self-assembled silver nanocolumns embedded in an amorphous Al₂O₃ matrix. The measured electron–lattice energy exchange time is smaller in the nanocolumns than in bulk silver, with a value very close to that of isolated nanospheres with comparable surface to volume ratio. Two vibration modes were detected and ascribed to the breathing and extensional mode of the nanocolumns, in agreement with numerical simulations.