Fe:ZnSe semiconductor nanocrystals: Synthesis, surface capping, and optical properties

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• 作者：Ruishi Xie^a ; ^{r.s.xie@163.com} ; Lihua Li^a ; Yuanli Li^a ; Lingyun Liu^a ; Dingquan Xiao^a ; Jianguo Zhu ; ^a ; ^{nic0400@scu.edu.cn}
• 关键词：Chemical synthesis ; Nanostructured materials ; Doping ; Optical properties
• 刊名：Journal of Alloys and Compounds
• 出版年：2011
• 出版时间：17 February 2011
• 年：2011
• 卷：509
• 期：7
• 页码：3314-3318
• 全文大小：929 K

文摘

Water-soluble Fe-doped ZnSe (Fe:ZnSe) nanocrystals (NCs) were synthesized by aqueous synthesis approach using thioglycolic acid (TGA) as capping agent. The undoped ZnSe and Fe:ZnSe NCs were well retained in the zinc blende structure, and the Fe dopants were well doped into the ZnSe NCs, as confirmed by X-ray photoelectron spectroscopy (XPS). The lattice constant of Fe:ZnSe NCs decreases slightly by the introduction of Fe, and Fe:ZnSe NCs exhibit a uniform size distribution with average grain size of 5 nm. The thioglycolic acid (TGA) was successfully capped on the surface of Fe:ZnSe NCs, confirmed by Fourier-transform-infrared (FT-IR) spectroscopy. The absorption edges of pure ZnSe and Fe:ZnSe NCs are blue-shifted compared to that of corresponding bulk ZnSe, indicating the quantum confinement effect, and the absorption edge of Fe:ZnSe NCs shows a slightly red shift with respect to the pure ZnSe NCs. The as-prepared Fe:ZnSe NCs exhibits an emission peak at 425 nm, and the photoluminescence (PL) intensity of the NCs has the maximum value when the Fe-doping concentration reaches 1.0 at % . It is of interest to note that the concentration quenching effect appears when the Fe-doping concentration is larger than 10.0 at % , and the underlying physical mechanisms were discussed.