Versatile synthesis of yolk/shell hybrid nanocrystals via ion-exchange reactions for novel metal/semiconductor and semiconductor/semiconductor conformations

摘要

Yolk/shell （Y-S） hybrid nanoarchitectures, owing to the interior voids createdfor individualized catalyst applications, have emerged as new candidates foreffectively isolating catalytic species. However, the well-defined hollow interiorswith flexible core and shell compositions--such as noble-metal cores, metal-oxidecores, and widespread semiconductor shells--and a flexible anisotropic shapeare far from the requirements. In particular, the introduction of catalytic noblemetals or metal-oxide nanocrystals （NCs） with isotropic or anisotropic shapesinto various hollow semiconductor structures with well-defined morphologieshas been rarely reported but is urgently needed. Herein, we propose a strategyinvolving the careful sulfuration of as-prepared cavity-free core/shell NCs ormetal-oxide NCs followed by phosphine-initialized cation-exchange reactionsfor preparing metal@semiconductor and metal oxide@semiconductor （II-VI） Y-SNCs. The geometry, size, and conformations of the core and shell are fully andindependently considered. New and unprecendented metal@semiconductorand metal oxide@semiconductor （II-VI） Y-S NCs are prepared via widespreadDhosDhine-initialized cation-exchange reactions.