Open AccessInterfacial Charge Carrier Dynamics in Core−Shell Au-CdS Nanocrystals
Author(s) -
Ting-Ting Yang,
Wei-Ta Chen,
YungJung Hsu,
K J Wei,
Tai-Yuan Lin,
Tai-Wei Lin
Publication year - 2010
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/jp103294c
Subject(s) - nanocrystal , materials science , photocurrent , photocatalysis , charge carrier , electron transfer , shell (structure) , electron , nanotechnology , nanoparticle , chemical physics , analytical chemistry (journal) , photochemistry , chemistry , optoelectronics , physics , composite material , biochemistry , chromatography , quantum mechanics , catalysis
The interfacial charge carrier dynamics for core−shell Au-CdS nanocrystals with various shell thicknesses were investigated and presented. Due to the difference in band structures between Au and CdS, a pronounced photoinduced charge separation took place at the interface of Au and CdS, resulting in the electron-charged Au core and the hole-enriched CdS shell. The electron-charging of Au core in Au-CdS nanocrystals was revealed with the corresponding XPS analysis and photocurrent measurement. Time-resolved PL spectra were measured to quantitatively analyze the electron transfer event between CdS shell and Au core for Au-CdS nanocrystals. An increase in the electron-transfer rate constant was observed for Au-CdS nanocrystals with increasing shell thickness, probably due to the less pronounced electron−hole interaction of thicker CdS, which enabled a fuller extent of participation of photoexcited electrons in the charge separation process. On the other hand, the hole-enriched CdS shell of Au-CdS nanocrystals...
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