Structure and optical properties of ZnS/SiO₂ nanocables

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• 作者：Yong Su ; Ling Li ; Xuemei Liang ; Qingtao Zhou ; Mi Gao ; Yiqing Chen ; Yi Feng
• 关键词：Nanostructure ; Growth from vapor ; Physical vapor deposition processes ; Semiconductors ; Luminescence
• 刊名：Materials Letters
• 出版年：2008
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 July 2008
• 卷：62
• 期：19
• 页码：3310-3312
• 文件大小：625 K

摘要

The nanocables with a single crystal ZnS core and a thin amorphous SiO₂ shell were successfully synthesized by a simple thermal evaporation method with the mechanism of Vapor–Solid growth. Its morphology and microstructure were determined by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS) and photoluminescence spectroscopy (PL). The ZnS/SiO₂ nanocables have diameters in the range of 20 nm–250 nm, lengths of several tens of micrometers. The core of the nanocable has a cubic sphalerite structure with the coexistence of periodically alternating twins along the [111] growth direction and stacking fault. The nanocables show strong room-temperature photoluminescence with four emission bands centering at 548 nm, 614 nm, 649 nm and 670 nm that may originate to the impurity of ZnS, existence of Si and oxide-related defects.