TAILIEUCHUNG - Báo cáo hóa học: " Synthesis, Optical Properties, and Photocatalytic Activity of One-Dimensional CdS@ZnS Core-Shell Nanocomposites"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Synthesis, Optical Properties, and Photocatalytic Activity of One-Dimensional CdS@ZnS Core-Shell Nanocomposites | Nanoscale Res Lett 2009 4 558-564 DOI S11671-009-9280-3 NANO EXPRESS Synthesis Optical Properties and Photocatalytic Activity of One-Dimensional CdS@ZnS Core-Shell Nanocomposites Le Wang Hongwei Wei Yingju Fan Xinzheng Liu Jinhua Zhan Received 30 December 2008 Accepted 16 February 2009 Published online 5 March 2009 to the authors 2009 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 k 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 Nanocomposites Nanowires Semiconductor Photocatalysis Cadmium sulfide Introduction One-dimensional 1D nanocomposites consisting of two important functional materials have attracted significant attention with respect to their fascinating properties and L. Wang H. Wei Y. Fan X. Liu J. Zhan El Department of Chemistry and Chemical Engineering Shandong University Jinan 250100 People s Republic of China e-mail jhzhan@ potential applications in the field of nanodevice fabrication 1-3 . Superior or new properties and diverse functions have been realized by assembling different

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