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Self-Organization of Semiconductor Quantum Nanocrystals on Carbon Single-Wall Nanotubes into Close-Packed Linear Arrays

Published online by Cambridge University Press:  01 February 2011

C. Engtrakul
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
J. M. Nedeljkovic
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
Y.-H. Kim
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
S. P. Ahrenkiel
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
K. E. H. Gilbert
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
J. L. Alleman
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
S. B. Zhang
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
O. I. Micic
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
A. J. Nozik
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
M. J. Heben
Affiliation:
Center for Basic Sciences, National Renewable Energy Laboratory, Golden, CO 80401
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Abstract

We report the synthesis of organized colloidal semiconductor nanocrystal / carbon singlewalled nanotube hybrid nanostructures. The synthetic protocol described here avoids the need for covalent chemical modification of carbon nanotube (CNT) surfaces. Specifically, InP quantum dots (QDs) and CdSe QDs were found to strongly adsorb onto the surfaces of carbon single-walled nanotubes (SWNTs) by gentle heating in organic solvents. Transmission electron microscopy (TEM) was used to characterize the semiconductor nanocrystal (NC) / SWNT assemblies, and revealed that the surfaces of the SWNT bundles template the adsorption of the NCs from solution. Small QDs were found to randomly absorb onto SWNTs, while larger QDs self-assembled into long linear chains. The nature of binding and ordering was investigated by simply considering van der Waals (vdW) forces for both NC-SWNT and NC-NC interactions. Quantum rods (QRs) were also found to adsorb along the nanotube surfaces. These findings have important implications for the synthesis of NC / SWNT hybrid nanostructures.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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Self-Organization of Semiconductor Quantum Nanocrystals on Carbon Single-Wall Nanotubes into Close-Packed Linear Arrays
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