Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties.
Cauliflower-like CdS microspheres composed of nanocrystals and their physicochemical properties.
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DOI：
10.1021/la1032288
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发表时间：
2011-01
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影响因子：
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通讯作者：
S. Rengaraj;S. Venkataraj;S. H. Jee;Younghun Kim;C. Tai;E. Repo;A. Koistinen;A. Ferancová;M. Sillanpää
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文献类型：
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作者：
S. Rengaraj;S. Venkataraj;S. H. Jee;Younghun Kim;C. Tai;E. Repo;A. Koistinen;A. Ferancová;M. Sillanpää
以聚乙二醇（PEG）为模板配位剂，采用水热法成功合成了由纳米晶组成的菜花状硫化镉（CdS）微球，并对其进行了表征。我们的实验证实，CdS微球的大小可以很容易地通过控制PEG的链长进行修改。粉末X射线衍射和拉曼光谱测试结果表明，CdS微球为立方结构; HR-SEM和HR-TEM测试结果表明，CdS微球为菜花状结构。每个微球被确定为通过CdS纳米晶体的自组装而产生，并且归因于CdS纳米晶体围绕聚合物-Cd（2+）复杂的球形框架结构的定向聚集。X射线光电子能谱（XPS）和能量色散X射线（EDX）分析证实了CdS微球的化学计量。漫反射光谱（DRS）的测量结果表明，增加PEG链长的CdS微球的带隙值略有增加，从1.99至2.06 eV。这种菜花状CdS微球可用于光催化降解研究。
Cauliflower-like cadmium sulfide (CdS) microspheres composed of nanocrystals have been successfully synthesized by a hydrothermal method using poly(ethylene glycol) (PEG) as the template coordination agent and characterized by a variety of methods. Our experiments confirmed that the size of the CdS microspheres could be easily modified by controlling the chain length of PEG. Powder X-ray diffraction and Raman spectroscopy measurements revealed the cubic structure of the CdS microspheres; morphological studies performed by HR-SEM and HR-TEM methods showed the cauliflower-like structure of the synthesized CdS microspheres. Each microsphere was identified to be created by the self-assembly of CdS nanocrystals and is attributed to the oriented aggregation of the CdS nanocrystals around a polymer-Cd(2+) complex spherical framework structure. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray (EDX) analysis confirmed the stoichiometries of the CdS microspheres. Diffuse reflectance spectrum (DRS) measurements showed that increasing the PEG chain length increased the band gap value of the CdS microspheres slightly, from 1.99 to 2.06 eV. The cauliflower-like CdS microspheres could be applied to photocatalytic degradation studies.