| 초록 |
Cation exchange is known as a powerful tool to design novel nanocrystals which cannot be synthesized by routine hot-injection or heating-up methods. Driven by difference of lattice energy or solvation energy, Pb2+ and Cd2+ cation can be exchanged with each other in various nanostructures including quantum dots (QDs), nanorods (NRs) and dot-in-rods, showing interesting properties. Although sequential process of cation exchange of CdSe into PbSe through Cu2Se was reported, direct cation exchange pathway of CdSe into PbSe has not been explored. Since the sequential cation exchange of CdSe includes ultra-fast process, exploring metastable states such as core/shell or other hetero-nanostructures is not possible. We present simple one-step process of Cd2+ to Pb2+ in CdSe quantum dots and nanorods using Pb-oleylamine complex as Pb precursor. The reaction exerts much milder kinetics which enables to control extent of exchange in Cd Chalcogenide. |
