Plasmon Bleaching Dynamics in Colloidal Gold-Iron Oxide Nanocrystal Heterodimers

被引：30

作者：

Comin, Alberto ^{[1
]}

Korobchevskaya, Kseniya

George, Chandramohan

Diaspro, Alberto

Manna, Liberato

机构：

[1] Ist Italiano Tecnol, NanoPhys Unit, I-16163 Genoa, Italy

来源：

NANO LETTERS | 2012年 / 12卷 / 02期

基金：

欧洲研究理事会;

关键词：

Nanocrystals; plasmon; carrier dynamics; gold/iron oxide hetero nanocrystals; CORE-SHELL NANOPARTICLES; METAL NANOPARTICLES; ULTRAFAST DYNAMICS; ELECTRON DYNAMICS; ENERGY RELAXATION; SIZE DEPENDENCE; HOT-ELECTRON; NANOSTRUCTURES;

D O I：

10.1021/nl2039875

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 heteroclimers 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-electron and electron-phonon relaxation times for the gold "nested" in the iron oxide domain in the heterodimers with respect to gold "only" 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.

引用

页码：921 / 926

页数：6

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