Atomic-scale evolution of a growing core-shell nanoparticle
by Shai Mangel, Eran Aronovitch, Andrey N Enyashin, Lothar Houben, and Maya Bar-Sadan
Understanding the atomic-scale growth at solid/solution interfaces is an emerging frontier in molecular and materials chemistry. This task is particularly challenging when studying the chemistry occurring on the surfaces of nanoparticles in solution. In the present study, atomic-scale resolution of growth, in a statistical approach, at the surfaces of inorganic nanoparticles is provided by state-of-the-art aberration-corrected transmission electron microscopy (TEM) and focal series reconstruction. Using wellknown CdSe nanoparticles, researchers from Russia, Israel and the ER-C unfold new information that, for the first time, allows following growth directly, and the subsequent formation of CdS shells. Synthetic procedures are correlated with the resulting atomic structure by revealing the distribution of lattice disorder (such as stacking faults) within the CdSe core particles. With additional sequential synthetic steps, an ongoing transformation of the entire structure occurs, such that annealing takes place and stacking faults are eliminated from the core. The general strategy introduced here can now be used to provide equally revealing atomic-scale information concerning the structural evolution of inorganic nanostructures.
Shai Mangel, Eran Aronovitch, Andrey N Enyashin, Lothar Houben, and Maya Bar-Sadan: Atomic-scale evolution of a growing core−shell nanoparticle, J Am Chem Soc 136 (2014) 12564-12567.