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Synthesis of water-soluble PbSe quantum dots

Published online by Cambridge University Press:  31 January 2011

Lioz Etgar ,
Efrat Lifshitz  and
Rina Tannenbaum
Lioz Etgar*
Affiliation:
Nanoscience and Nanotechnology, Technion, Israel Institute of Technology, Haifa 32000, Israel
Efrat Lifshitz
Affiliation:
Chemistry, Technion, Israel Institute of Technology, Haifa 32000, Israel
Rina Tannenbaum
Affiliation:
Chemical Engineering, Technion, Israel Institute of Technology, Haifa 32000, Israel; and School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
*
a)Address all correspondence to this author. e-mail: liozet@tx.technion.ac.il
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Abstract

Water-soluble PbSe semiconductor quantum dots (QDs) with near-infrared absorption of 1100–2520 nm (corresponding to a diameter of 3–13 nm) were synthesized using 2-aminoethanthiol (AET). The oleic acid-stabilizing ligands used in the traditional synthesis of PbSe were exchanged with the 2-AET ligands, which promoted the solubilization of the QDs in an aqueous medium. This occurred due to the attraction of the surrounding water molecules to the exposed amino group, thus allowing the particles to reside in the water environment. The water-soluble PbSe QDs have very narrow size distribution (σ ≈ 4.5–5.5%). Transmission electron microscopy, spectrophotometric measurements, and Fourier transform infrared spectroscopy indicate that the morphology, size, size distribution, and chemical composition of the PbSe QDs remained unchanged during the transfer to an aqueous medium. In conclusion, the ability to synthesize water-soluble PbSe QDs with stable properties and uniform size distribution will allow them to have substantial advantages for biological applications such as biosensors and drug delivery.

Keywords

Chemical synthesisNanostructureSelf-assembly
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 4 , April 2008 , pp. 899 - 903
Copyright
Copyright © Materials Research Society 2008

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