| 초록 |
Colloidal quantum-dot photocatalysts has attracted great attention for water splitting hydrogen generation because of their many advantages, such as size-dependent absorption properties, longer exciton lifetimes, possibility of generating multiple excitons by single photon, and enhanced photo-stability. Among them, CdSe/CdS dot-in-rod structure, which consists of CdSe spherical core in CdS rod, shows slow exciton recombination and highest hydrogen generation activity than core-shell CdSe/CdS hetero-structures. As overlap region of electron and hole probability wave function decreases, dot-in-rod structure shows slow recombination rate, enhanced charge separation rate, enhanced photo-stability. In this work, we systematically control CdSe core position in the CdS nanorod with adjusting growth rate in axial direction in CdSe/CdS dot-in-rod heterostructure. CdSe/CdS dot-in-rod core position dependent photocatalytic activity and design efficient structure of CdSe/CdS dot-in-rod structure for photocatalytic hydrogen evolution. By using different facet reactivity of wurtzite structure, we synthesized core position controlled CdSe/CdS dot-in-rod. |
