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Journal of Nanotechnology
Volume 2014, Article ID 285857, 7 pages
http://dx.doi.org/10.1155/2014/285857
Research Article

Noncovalent Attachment of PbS Quantum Dots to Single- and Multiwalled Carbon Nanotubes

1Department of Chemistry, University of Idaho, Renfrew Hall, Moscow, ID 83844, USA
2Center for Catalysis and Surface Science, Northwestern University, 2137 Tech Drive, Evanston, IL 60208-3000, USA

Received 8 June 2013; Revised 31 January 2014; Accepted 1 February 2014; Published 10 March 2014

Academic Editor: Bobby G. Sumpter

Copyright © 2014 Anirban Das et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Attachment of PbS quantum dots (QD) to single-walled carbon nanotubes (SWNT) and multiwalled carbon nanotubes (MWCNT) is described; wherein commercially obtained PbS-QD of size 2.7 nm, stabilized by oleic acid, are added to a suspension of single- or multiwalled carbon nanotubes (CNT) prefunctionalized noncovalently with 1,2-benzenedimethanethiol (1,2-BDMT) in ethanol. The aromatic part of 1,2-BDMT attaches to the CNT by π-π stacking interactions, noncovalently functionalizing the CNT. The thiol part of the 1,2-BDMT on the functionalized CNT replaces oleic acid on the surface of the QD facilitating the noncovalent attachment of the QD to the CNT. The composites were characterized by TEM and FTIR spectroscopy. Quenching of NIR fluorescence of the PbS-QD on attachment to the carbon nanotubes (CNT) was observed, indicating FRET from the QD to the CNT.