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Synthesis and characterization of large-scale hierarchical dendrites of single-crystal CdS

机译:CdS单晶大规模分层枝晶的合成与表征

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Large-scale hierarchical CdS dendrites were synthesized by hydrothermal treatment of CdCl2 and thiourea, using poly( ethylene glycol) ( PEG) as a capping agent. The products were characterized by X-ray diffraction, energy-dispersive X-ray spectrometry, transmission electron microscopy, field emission scanning electron microscopy, and selected area electronic diffraction. The individual CdS dendrite is composed of a long central trunk with secondary and tertiary branches, which preferentially grew in a parallel direction with a definite angle to the trunk. The results reveal that the dendrites are single crystalline in nature. The contrast experiments demonstrated that both thiourea and the additive PEG are necessary for building hierarchically self-assembled CdS dendrites in a water system. Moreover, the possible growth process has been discussed based on the analyses of detailed configuration and the effects of surfactants in the system.
机译:使用聚乙二醇(PEG)作为封端剂,对CdCl2和硫脲进行水热处理,合成出大规模的分级CdS树突。通过X射线衍射,能量色散X射线光谱法,透射电子显微镜,场发射扫描电子显微镜和选择区域电子衍射对产物进行表征。单个CdS树枝状晶体由一个长的中心树干组成,该树干具有二级和三级分支,优先沿平行方向生长,且与树干成一定角度。结果表明,树枝状晶体本质上是单晶的。对比实验表明,硫脲和添加剂PEG对在水系统中构建自组装的CdS树枝状晶体都是必需的。此外,基于对详细配置和系统中表面活性剂影响的分析,讨论了可能的生长过程。

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