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Cyclodextrins Stabilize TOPO-(CdSe)ZnS Quantum Dots In Water

Published online by Cambridge University Press:  17 March 2011

Jun Feng ,
Yong-Hyun Kim ,
S. B. Zhang ,
Shi-You Ding ,
Melvin P. Tucker ,
Garry Rumbles  and
Michael E. Himmel
Jun Feng
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, [email protected]
Yong-Hyun Kim
Affiliation:
Centers for National Bioenergy and Basic Science, Golden, Colorado 80401
S. B. Zhang
Affiliation:
Centers for National Bioenergy and Basic Science, Golden, Colorado 80401
Shi-You Ding
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, [email protected]
Melvin P. Tucker
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, [email protected]
Garry Rumbles
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, [email protected]
Michael E. Himmel
Affiliation:
National Renewable Energy Laboratory, Golden, Colorado 80401, [email protected]
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Abstract

Chemical action between cyclodextrins (CDs) and TOPO-(CdSe)ZnS quantum dots (QDs) generates a water-soluble solution of CD-QDs. Hydrophobic TOPO molecules on surface of the QDs are compatible to thread through the pockets of CDs and make the hydroxyl group on end of CDs to approach the ZnS surface, and then cause the interaction between ZnS and the hydroxyls. In this paper, Photoluminescence of the γ-CD-QD solution appeared about 15 nm of red movement compared with that of the QDs in hexane; 58% replacement of the crystal coordinate bond of Zn-S with that of Zn-O in the ZnS shell was demonstrated by using first-principles density functional theory and the red shift of the photoluminescence of CD-QDs; and –0.11eV of the energy gain of the exchange model was calculated by using an effective mass (EM) model. CD-QDs will provide water-soluble QDs with conjugational group for biology and molecule-device applications.

Keywords

CyclodextrinsQuantum dotsCyclodextrin-quantum dotswater-soluble
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 823: Symposium W – Biological and Bioinspired Materials and Devices , 2004 , W4.5
Copyright
Copyright © Materials Research Society 2004

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