Plasmon Bleaching Dynamics in Colloidal Gold鈥揑ron Oxide Nanocrystal Heterodimers
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- 作者：Alberto Comin ; Kseniya Korobchevskaya ; Chandramohan George ; Alberto Diaspro ; Liberato Manna
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：February 8, 2012
- 年：2012
- 卷：12
- 期：2
- 页码：921-926
- 全文大小：336K
- 年卷期：v.12,no.2(February 8, 2012)
- ISSN：1530-6992
文摘
Colloidal nanocrystal heterodimers composed of a plasmonic and a magnetic domain have been widely studied as potential materials for various applications in nanomedicine, biology, and photocatalysis. One of the most popular nanocrystal heterodimers is represented by a structure made of a Au domain and a iron oxide domain joined together. Understanding the nature of the interface between the two domains in such type of dimer and how this influences the energy relaxation processes is a key issue. Here, we present the first broad-band transient absorption study on gold/iron oxide nanocrystal heterodimers that explains how the energy relaxation is affected by the presence of such interface. We found faster electron鈥揺lectron and electron鈥損honon relaxation times for the gold 鈥渘ested鈥?in the iron oxide domain in the heterodimers with respect to gold 鈥渙nly鈥?nanocrystals, that is, free-standing gold nanocrystals in solution. We relate this effect to the decreased electron screening caused by spill-out of the gold electron distribution at gold/iron oxide interface.