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Communication

Size-Dependent Electron Injection from Excited CdSe Quantum Dots into TiO₂ Nanoparticles

Supporting Info

István Robel,^†^¶ Masaru Kuno,*^†^‡ and Prashant V. Kamat*^†^‡^§

Radiation Laboratory, Department of Chemistry and Biochemistry, Department of Chemical and Biomolecular Engineering, and Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556

J. Am. Chem. Soc., 2007, 129 (14), pp 4136–4137

DOI: 10.1021/ja070099a

Publication Date (Web): March 21, 2007

†

Radiation Laboratory.

Department of Physics.

In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.

‡

Department of Chemistry and Biochemistry.

Department of Chemical and Biomolecular Engineering.

, pkamat@nd.edu

Abstract

Electron injection from excited CdSe quantum dots into TiO₂ nanoparticles can be easily modulated by controlling the particle size. Femtosecond transient absorption studies indicate that the rate constant for electron transfer from the thermalized s-state of CdSe quantum dots increases with decreasing particle size. The energy difference between the conduction bands of the two semiconductor systems acts as a driving force for the electron transfer in the normal Marcus region. An increase in the interparticle electron transfer rate constant by 3 orders of magnitude (from 10⁷ to 10¹⁰ s^-1) has been achieved by decreasing the CdSe particle diameter from 7.5 to 2.4 nm.

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Published In Issue April 11, 2007
Received January 5, 2007

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Communication

Size-Dependent Electron Injection from Excited CdSe Quantum Dots into TiO₂ Nanoparticles