Growth mechanism and photoluminescence property of flower-like ZnO nanostructures synthesized by starch-assisted sonochemical method.
Growth mechanism and photoluminescence property of flower-like ZnO nanostructures synthesized by starch-assisted sonochemical method.
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DOI：
10.1016/j.ultsonch.2009.10.017
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发表时间：
2010-03
影响因子：
8.4
通讯作者：
Priya Mishra;R. S. Yadav;A. C. Pandey
中科院分区：
文献类型：
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作者：
Priya Mishra;R. S. Yadav;A. C. Pandey
采用淀粉辅助超声化学法合成了花状氧化锌纳米结构，研究了淀粉和超声波对纳米结构形成的影响。研究发现，淀粉和超声波对氧化锌纳米结构的生长都起着至关重要的作用。X射线衍射图表明，所合成的花状氧化锌纳米结构为六方晶系。红外光谱证实了花状氧化锌纳米结构表面有淀粉的存在。花状氧化锌纳米结构的光致发光光谱由393 nm的带边发射和缺陷发射峰组成。根据X射线衍射仪提供的结构信息和扫描电子显微镜提供的形貌信息，提出了形成花状氧化锌纳米结构的生长机理。用差示扫描量热法(DSC)测定了淀粉在液体介质中的糊化过程，证实了糊化过程是一个分两相的两步过程。
Flower-like ZnO nanostructures have been synthesized by starch-assisted sonochemical method and the effect of starch and ultrasound on the formation of ZnO nanostructure has been investigated. It is observed that starch and ultrasonic wave both plays a vital role on the growth of ZnO nanostructure. X-ray diffraction (XRD) pattern indicated that the synthesized flower-like ZnO nanostructures were hexagonal. FTIR spectrum confirms the presence of starch on the surface of flower-like ZnO nanostructure. The photoluminescence spectrum of flower-like ZnO nanostructure consists of band-edge emission at 393nm as well as emission peaks due to defects. On the basis of structural information provided by X-ray diffraction (XRD) and morphological information by Scanning Electron Microscopy (SEM), a growth mechanism is proposed for formation of flower-like ZnO nanostructures. Differential Scanning Calorimetry (DSC) of starch in liquid medium confirms that gelatinization is a two step process involving two phases.