Stability of Nanocrystals in 2D- and 3D-Systems at the Stage of Ostwald Ripening

Abstract

The Chakraverti–Wagner distribution and Generalized–Lifshitz–Slezov–Wagner distribution are compared within the LSW theory modified for the surface (2D-system) and for the volume (3D-system) with the experimental histograms of nanocrystals (quantum dots) obtained with different technologies: electron-beam (molecular beam) epitaxy, liquid phase epitaxy, and colloidal chemistry. Matching of the experimental histograms with theoretically calculated curves indicates the possibility of nanocrystal growth (dissolution) at the stage of Ostwald ripening simultaneously by two mechanisms—diffusion and chemical reaction, which are controlled accordingly by diffusion coefficients D_s (D_v) and kinetic coefficient β. The results of the studies on the mechanisms of nanocrystal growth at the stage of Ostwald ripening may be used in technological processes of their synthesis.