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Synthesis of Water Soluble PbSe Quantum Dots

Published online by Cambridge University Press:  01 February 2011

Lioz Etgar ,
Efrat Lifshitz  and
Rina Tannenbaum
Lioz Etgar
Affiliation:
[email protected], Technion, Nanoscience and Nanotechnology, Technion city, Haifa, 32000, Israel
Efrat Lifshitz
Affiliation:
[email protected], Technion, Chemistry, Israel Institute of Technology, Haifa, 32000, Israel
Rina Tannenbaum
Affiliation:
[email protected], Technion, Chemical Engineering, Israel Institute of Technology, Haifa, 32000, Israel
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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. The oleic acid stabilizing ligands used in the traditional synthesis of PbSe were exchanged with the 2-aminoethanethiol (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 (TEM), spectrophotometric measurements, and Fourier transform infrared (FTIR) 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

nanoscaleII-VIcrystal growth
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 959: Symposium M – Quantum Dots—Growth, Behavior and Applications , 2006 , 0959-M03-03
Copyright
Copyright © Materials Research Society 2007

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