Nanoconfinement‐Controlled Synthesis of Highly Active, Multinary Nanoplatelet Catalysts from Lamellar Magic‐Sized Nanocluster Templates

Abstract Magic‐sized semiconductor nanoclusters (MSCs) possessing intermediate stability are promising precursors for synthesizing low‐dimensional nanostructures that cannot be achieved by direct methods. However, uncontrolled diffusion of MSCs in their colloidal‐state poses challenges in utilizing them as precursors and/or templates for the controlled synthesis of nanomaterials. Herein, a nanoconfined diffusion‐limited strategy to synthesize large CdSe nanoplatelets through the solid‐state transformation of (CdSe)13 MSCs is designed, wherein MSCs serve as both precursors and lamellar bilayer templates. In sharp contrast, in the colloidal‐state, these MSCs are grown to CdSe nanoribbons or nanorods. Furthermore, the nanoconfined route is used not only to transform (CdSe)13, Mn2+:(CdSe)13, and Mn2+:(Cd1−xZnxSe)13 MSCs but also to dope Cu+, producing Cu+:CdSe, Mn2+/Cu+:CdSe, Mn2+/Cu+:Cd1−xZ…