Journal
NANO LETTERS
Volume 12, Issue 2, Pages 921-926Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl2039875
Keywords
Nanocrystals; plasmon; carrier dynamics; gold/iron oxide hetero nanocrystals
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Funding
- ERC [240111]
- European Research Council (ERC) [240111] Funding Source: European Research Council (ERC)
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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.
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