Synthesis, Optical Properties, and Photocatalytic Activity of One-Dimensional CdS@ZnS Core-Shell Nanocomposites
Open Access
- 5 March 2009
- journal article
- research article
- Published by Springer Science and Business Media LLC in Nanoscale Research Letters
- Vol. 4 (6), 558-564
- https://doi.org/10.1007/s11671-009-9280-3
Abstract
One-dimensional (1D) CdS@ZnS core-shell nanocomposites were successfully synthesized via a two-step solvothermal method. Preformed CdS nanowires with a diameter of ca. 45 nm and a length up to several tens of micrometers were coated with a layer of ZnS shell by the reaction of zinc acetate and thiourea at 180 °C for 10 h. It was found that uniform ZnS shell was composed of ZnS nanoparticles with a diameter of ca. 4 nm, which anchored on the nanowires without any surface pretreatment. The 1D CdS@ZnS core-shell nanocomposites were confirmed by XRD, SEM, TEM, HR-TEM, ED, and EDS techniques. The optical properties and photocatalytic activities of the 1D CdS@ZnS core-shell nanocomposites towards methylene blue (MB) and 4-chlorophenol (4CP) under visible light (λ > 420 nm) were separately investigated. The results show that the ZnS shell can effectively passivate the surface electronic states of the CdS cores, which accounts for the enhanced photocatalytic activities of the 1D CdS@ZnS core-shell nanocomposites compared to that of the uncoated CdS nanowires.Keywords
This publication has 47 references indexed in Scilit:
- Synthesis, Structure, and Multiply Enhanced Field-Emission Properties of Branched ZnS Nanotube−In Nanowire Core−Shell HeterostructuresACS Nano, 2008
- One-step preparation of coaxial CdS–ZnS nanowiresChemical Communications, 2004
- Single-crystal metallic nanowires and metal/semiconductor nanowire heterostructuresNature, 2004
- Transition Metal Oxide Core−Shell Nanowires: Generic Synthesis and Transport StudiesNano Letters, 2004
- Hybrid Devices from Single Wall Carbon Nanotubes Epitaxially Grown into a Semiconductor HeterostructureNano Letters, 2004
- Metal−Semiconductor Zn−ZnO Core−Shell Nanobelts and NanotubesThe Journal of Physical Chemistry B, 2003
- Thermal Reduction Route to the Fabrication of Coaxial Zn/ZnO Nanocables and ZnO NanotubesChemistry of Materials, 2002
- Atomic layer deposition of ZnSe/CdSe superlattice nanowiresApplied Physics Letters, 2002
- Growth of nanowire superlattice structures for nanoscale photonics and electronicsNature, 2002
- Coaxial Nanocable: Silicon Carbide and Silicon Oxide Sheathed with Boron Nitride and CarbonScience, 1998