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首页> 外文期刊>RSC Advances >Microstructure, vibrational and visible emission properties of low frequency ultrasound (42 kHz) assisted ZnO nanostructures
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Microstructure, vibrational and visible emission properties of low frequency ultrasound (42 kHz) assisted ZnO nanostructures

机译：低频超声（42kHz）辅助ZnO纳米结构的微观结构，振动和可见光性能

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摘要

Size and shape tuneable ZnO nanostructures were prepared by a low frequency ultrasound (42 kHz) route using various organic solvents as the reaction media. The crystalline nature, lattice parameters and microstructural parameters such as microstrain, stress and energy density of the prepared ZnO nanostructures were revealed through X-ray diffraction (XRD) analysis. The organic solvents influenced the size and morphology of the ZnO nanostructures, and interesting morphological changes involving a spherical to triangular shaped transition were observed. The visible emission properties and lattice vibrational characteristics of the nanostructures were drastically modified by the changes in size and shape. Raman spectral measurements revealed the presence of multiphonon processes in the ZnO nanostructures. The intensity of the visible emission band was found to vary with the size and morphology of the structures. The strongest visible emission band corresponded to the structure with the largest surface/volume ratio and could be attributed to surface oxygen vacancies. The control over the size and morphology of ZnO nanostructures has been presented as a means of determining the intensity of the visible emission band.
机译：通过使用各种有机溶剂作为反应介质，通过低频超声（42kHz）途径制备尺寸和形状可调ZnO纳米结构。通过X射线衍射（XRD）分析揭示了制备ZnO纳米结构的微陶器，应力和能量密度的结晶性质，晶格参数和微观结构参数。有机溶剂影响了ZnO纳米结构的尺寸和形态，观察到涉及球形到三角形转变的有趣形态变化。通过尺寸和形状的变化，纳米结构的可见发射性能和晶格振动特性急剧修饰。拉曼光谱测量揭示了ZnO纳米结构中的多光处理的存在。发现可见发射带的强度随着结构的尺寸和形态而变化。最强的可见发射带对应于具有最大表面/体积比的结构，并且可以归因于表面氧空位。对ZnO纳米结构的尺寸和形态的控制已经呈现为确定可见发射带的强度的手段。

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