Growth kinetics determine the polydispersity and size of PbS and PbSe nanocrystals.

ABSTRACT: A library of thio- and selenourea derivatives is used to adjust the kinetics of PbE (E = S, Se) nanocrystal formation across a 1000-fold range (k _r = 10^-1 to 10^-4 s^-1), at several temperatures (80-120 °C), under a standard set of conditions (Pb : E = 1.2 : 1, [Pb(oleate)₂] = 10.8 mM, [chalcogenourea] = 9.0 mM). An induction delay (t _ind) is observed prior to the onset of nanocrystal absorption during which PbE solute is observed using in situ X-ray total scattering. Density functional theory models fit to the X-ray pair distribution function (PDF) support a Pb₂(μ₂-S)₂(Pb(O₂CR)₂)₂ structure. Absorption spectra of aliquots reveal a continuou

SUBMITTER: Campos MP 

PROVIDER: S-EPMC9019910 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature