| 微观尺度高分子协同组装ZnO纳米片 | |
| Polymer-Assisted Micro-Scale Assembly of ZnO Nanosheets | |
| 摘要: 以醇水混合体系作为反应介质，六水合硝酸锌和尿素为原料，聚乙烯吡咯烷酮(PVP)作为模板剂，经水热过程合成了由纳米片组装的花状微球碱式碳酸锌前驱体，经热处理得到相应的氧化锌(ZnO)产物。采用X射线衍射(XRD)和环境扫描电镜(SEM)对样品进行了表征，结果表明产物为六方纤维矿结构的ZnO，单分散花状微球直径约为2 μm，尺寸均一，组装成微球的纳米片构筑单元厚度为20 nm。红外分析表明PVP与Zn2+之间的化学配位作用发生在侧环的内酰基C=O键上的O位与Zn2+之间，研究表明PVP用量影响组装过程，在相同实验条件下，用聚乙二醇(PEG)代替PVP的模板作用，得到了粒径较大的纳米片组装的微球(φ～15 μm)，在此基础上探讨了高分子结构对晶体生长和组装机制的影响。 | |
| 关键词: 水热合成 高分子 ZnO 微球 模板 | |
| 基金项目: | |
| Abstract: The nanosheets-based flower-like micropheres of layer Zn5(CO3)2(OH)6 precursor were prepared via the hydrothermal process using polyvinyl pyrrolidone(PVP) as the template in a mixed solution of ethanol and water, and the corresponding ZnO nanosheets assembled microsphere was obtained by the following calcination treatment. The samples were characterized using X-ray diffraction(XRD) and scanning electron microscopy(SEM). The XRD pattern of the product is indexed very well to hexagonal wurtzite structure of ZnO. The monodispersed flower-like ZnO nanosheets microspheres have a nearly homogeneous size of ～2 μm, and the thickness of the nanosheets assembled building blocks is ～20 nm. The study shows that the concentration of PVP affects the assembly process. The size of ZnO micropheres increases to ～15 μm when polyethylene glycol(PEG) is used instead of PVP under the same experimental condition. The impact of polymer structure on the crystal growth and the assembly process is also discussed. | |
| Keywords: hydrothermal synthesis polymer zinc oxide microspheres template | |
| 摘要点击次数: 2007 | |
| 全文下载次数: 2651 | |
| 李 博,崔玉明,刘 磊,陈 洁,朱 清,周幸福.微观尺度高分子协同组装ZnO纳米片[J].无机化学学报,2009,25(12):2077-2082. | |
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