Oriented Assembly of CdS nanocrystals via Dynamic Surface Modifications Tailored Particle Interaction
The controlled assembly of quantum dots remains challenge for lack of in-depth understanding on roles of ligand dynamics. In this work, tripods, particles, nanorods or nanoflowers of CdS with yellow, red or green PL emission were achieved respectively, through coarsening TGA-CdS QDs with different hydroxyl-TGA exchange procedure. Dynamic hydroxyl modifications induced aggregation and coalescence can help to describe the defects and corresponding photoluminescence characteristics of these nanocrystals. Crystal growth model involving assembly and coalescence was developed to describe the crystal growth and corresponding PL properties, where hydroxyl motivated hydrogen-bonding interaction was used to explain the oriented assembly of CdS QDs.