Primary Alkyl Amine-Mediated ZnSe@ZnS QDs from Giant Flowers to Nanorods

Abstract

Understanding the relationship between surface ligands and colloidal quantum dots (QDs) is crucial for precisely controlling their size, morphology, and composition. Compared to traditional Cd- or Pb-based II–VI QDs, the precise synthesis of zinc-based colloidal ZnSe@ZnS QDs remains challenging due to zinc’s high oxytropism and diffusion tendencies. Herein, we introduce a primary alkyl amine-mediated surface engineering strategy that enables morphology control: from giant flowers and clovers to branches and nanorods (NRs). Fine structural analysis and theoretical calculations reveal that ligand affinity and low adsorption energy promote rod-shaped growth. From both fundamental and industrial perspectives, it is essential to explore the underlying mechanisms and inherent properties that influence these processes. Such insights will enhance the potential applications of these materials in photocatalysis, sensing, and illumination.