Chemistry Faculty Publications

Document Type

Article

Abstract

We employ femtosecond transient absorption spectroscopy to get an insight into ultrafast processes occurring at the interface of type II ZnSe/CdS heterostructured nimocrystals fabricated via colloidal routes and comprising a barbell-like arrangement of ZnSe tips and CdS nanorods. Our study shows that resonant excitation of ZnSe tips results in an unprecedently fast transfer of excited Electrons into CdS domains of nanobarbells (<0.35 ps), whereas selective pumping of CdS components loads to a relatively slow injection of photoinduced holes into ZnSe tips (tau(h) = 95 ps). A qualitative thermodynamic description of observed electron processes within the classical limit of Marcus theory was used to identify a specific charge transfer regime associated with the ultrafast electron injection into CdS. Potential photocatalytic applications of the observed fast separation of carriers along the main axis of ZnSe/CdS barbells are discussed.

Publication Date

4-2010

Publication Title

ACS Nano

Volume

4

Issue

4

Start Page No.

1837

End Page No.

1844

DOI

10.1021/nn100229x

Included in

Chemistry Commons

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