jp0563585_si_001.pdf (816 kB)
Multigram Scale, Solventless, and Diffusion-Controlled Route to Highly Monodisperse PbS Nanocrystals
journal contribution
posted on 2006-01-19, 00:00 authored by Ludovico Cademartiri, Jacopo Bertolotti, Riccardo Sapienza, Diederik S. Wiersma, Georg von Freymann, Geoffrey A. OzinHigh-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.