Multigram scale, solventless, and diffusion-controlled route to highly monodisperse PbS nanocrystals.
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-controlled Ostwald growth in conditions of strong supersaturation.
Materials Chemistry Research Group, Lash Miller Chemical Laboratories, Department of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6 Canada.
Ludovico
L
Cademartiri
Jacopo
J
Bertolotti
Riccardo
R
Sapienza
Diederik S
DS
Wiersma
Georg
G
von Freymann
Geoffrey A
GA
Ozin