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Cyclodextrin driven hydrophobic/hydrophilic transformation of semiconductor nanoparticles

Appl. Phys. Lett. 86, 033108 (2005); doi:10.1063/1.1854739

Published 13 January 2005

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Jun Feng, Shi-You Ding, Melvin P. Tucker, and Michael E. Himmel
National Bioenergy Center, National Renewable Energy Laboratory, Golden, Colorado 80401

Yong-Hyun Kim, S. B. Zhang, Brian M. Keyes, and Garry Rumbles
Basic Sciences Center, National Renewable Energy Laboratory, Golden, Colorado 80401
Quantum dots (QDs) have been the subject of considerable study in theoretical physics, and water soluble QDs now appear to have numerous applications in biological tagging, molecular electronic devices, and nanoscale engineering. The work reported here supports the notion that the aliphatic chains of the trioctylphosphine oxide molecules decorating these (CdSe)ZnS core-shell QDs are stabilized by the hydrophobic cyclodextrin (CD) lumen. Photoluminescence studies show a redshift of over 15  nm in the emission wavelength of the QDs upon complexation with the CD, and first-principles calculations reveal an exothermic exchange of the S in the ZnS shell with the CD hydroxyl oxygen. Unlike simple water-driven surface transformations, the directed bonding of hydroxyl groups to the ZnS shell results in stable structures, verified by photoluminescence and Fourier transform infrared spectroscopy. ©2005 American Institute of Physics
History: Received 14 July 2004; accepted 24 November 2004; published 13 January 2005
Permalink: http://link.aip.org/link/?APPLAB/86/033108/1
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KEYWORDS and PACS

Keywords
PACS
  • 68.65.Hb
    Quantum dots (structure and nonelectronic properties)
  • 68.35.Rh
    Phase transitions and critical phenomena (solid surfaces/interfaces)
  • 78.67.Hc
    Optical properties of quantum dots
  • 78.55.Et
    Photoluminescence in II–VI semiconductors
  • 78.67.Bf
    Optical properties of nanocrystals and nanoparticles
  • 61.46.+w
    Structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
  • YEAR: 2005

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0003-6951 (print)   1077-3118 (online)
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