Multigram scale, solventless, and diffusion-controlled route to highly monodisperse PbS nanocrystals

Year: 2006

Authors: Cademartiri L, Bertolotti J., Sapienza R., Wiersma D., von Freymann G., Ozin GA.

Autors Affiliation: Univ Toronto, Dept Chem, Mat Chem Res Grp, Lash Miller Chem Labs, Toronto, ON M5S 3H6, Canada; Univ Florence, European Lab NonLinear Spect, LENS, I-50019 Florence, Italy;
Univ Florence, INFM, MATIS, I-50019 Florence, Italy

Abstract: High-quality PbS nanocrystals were produced in multigram-scale quantities through a solventless, heterogeneous, and relatively green route. The heterogeneous nature of this reaction allows one to limit the diffusion in the system, allowing for unprecedented monodispersity and quality of the product demonstrated by a full-width at half-maximum of the photoluminescence peak (PL fwhm) as low as 52 meV, a Stokes shift as low as 10 meV, and a quantum yield (QY) of 40%. The growth of the nanocrystals is interpreted in the framework of a diffusion-control led Ostwald growth in conditions of strong supersaturation.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY B

Volume: 110 (2)      Pages from: 671  to: 673

KeyWords: Diffusion; Nanostructured materials; Photoluminescence; Quantum efficiency; Reaction kinetics; Supersaturation, Monodispersity; Nanocrystals; Lead compounds
DOI: 10.1021/jp0563585

Citations: 267
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