Facile Controlled Synthesis and Spectroscopy of CdS1−xSex Alloy and (CdS)1−x@(CdSe)x Core–Shell Nanotetrapods

Abstract

AbstractNanotetrapods of alloy CdS1−xSex and core–shell (CdS)1−x@(CdSe)x are fabricated easily in water using ethylenediamine as a solvent‐coordinating molecular template, and then their optical properties are investigated using diverse static and time‐resolved spectroscopic methods. The arms of the alloy nanotetrapods have single‐crystalline structures of CdS1−xSex without showing staking faults, while the arms of the core–shell nanotetrapods display polycrystalline shell structures of CdSe. The optical properties of CdS1−xSex, where Se atoms are isolated in the CdS lattice, are very different from those of (CdS)1−x@(CdSe)x, where banded CdSe passivates the CdS core. Compared with pure CdS nanotetrapods, the photoluminescence of CdS0.9Se0.1 shifts to the red by 40 nm, whereas that of (CdS)0.9@(CdSe)0.1 does so only by 5 nm. Although the mean luminescence lifetime of alloy CdS1−xSex is shorter than that of pure CdS, it is still much longer than that of core‐shell (CdS)1−x@(CdSe)x.