淀粉辅助超声化学法合成花状 ZnO 纳米结构的生长机制及光致发光性能。
Growth mechanism and photoluminescence property of flower-like ZnO nanostructures synthesized by starch-assisted sonochemical method.
机构信息
Nanophosphor Application Centre, University of Allahabad, Allahabad 211 002, India.
出版信息
Ultrason Sonochem. 2010 Mar;17(3):560-5. doi: 10.1016/j.ultsonch.2009.10.017. Epub 2009 Oct 30.
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.
通过淀粉辅助超声化学法合成了具有花状结构的 ZnO 纳米材料，并研究了淀粉和超声对 ZnO 纳米结构形成的影响。结果表明，淀粉和超声波在 ZnO 纳米结构的生长过程中都起着至关重要的作用。X 射线衍射（XRD）图谱表明，所合成的花状 ZnO 纳米结构为六方晶系。傅里叶变换红外（FTIR）光谱证实了花状 ZnO 纳米结构表面存在淀粉。花状 ZnO 纳米结构的光致发光光谱由 393nm 的带边发射以及缺陷引起的发射峰组成。基于 X 射线衍射（XRD）提供的结构信息和扫描电子显微镜（SEM）提供的形态信息，提出了花状 ZnO 纳米结构形成的生长机制。淀粉在液态介质中的差示扫描量热法（DSC）证实，糊化是一个涉及两个阶段的两步过程。
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