Influence of potassium permanganate on the anisotropic growth and enhanced UV emission of ZnO nanostructures using hydrothermal process for optoelectronic applications
Influence of potassium permanganate on the anisotropic growth and enhanced UV emission of ZnO nanostructures using hydrothermal process for optoelectronic applications
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DOI：
10.1007/s10971-015-3741-1
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发表时间：
2015-09-01
影响因子：
2.5
通讯作者：
Singh, Vipul
中科院分区：
文献类型：
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作者：
Dixit, Tejendra;Bilgaiyan, Anubha;Singh, Vipul
研究了原位添加高锰酸钾（KMnO 4）对水热法制备的ZnO纳米结构的形貌、组成、结构和光学性质的影响。采用场发射扫描电子显微镜、X射线衍射仪、透射电子显微镜和高分辨透射电子显微镜研究了合成条件对ZnO纳米棒生长的影响。结果表明，KMnO 4浓度对ZnO纳米棒的形貌和取向有很大的影响。利用光致发光（PL）光谱和紫外-可见漫反射光谱研究了纳米结构的光学性质。的PL光谱泄露了一个连续的抑制缺陷相关的宽带发射通过增加浓度的KMnO 4，这产生了淬火的表面缺陷存在于纳米棒。与近带发射（NBE）的深能级发射的KMnO 4改性的ZnO纳米棒的峰值的强度比被发现增加了8倍的幅度。此外，必须注意的是，与没有任何添加剂生长的ZnO相比，在KMnO 4改性的ZnO中观察到对应于NBE的峰的PL发射的近17倍增强。I-V曲线显示在黑暗和光照下的电流值依赖于在生长阶段添加的KMnO 4的量。[图形]。
The effect of in situ addition of potassium permanganate (KMnO4) in controlling morphology, composition, structural and optical properties of the ZnO nanostructures prepared by hydrothermal technique has been investigated. The influence of synthesis conditions on the growth of ZnO nanorods was meticulously studied by field-emission scanning electron microscope, X-ray diffractometer, transmission electron microscopy (TEM) and high-resolution TEM. It is demonstrated that the KMnO4 concentration has great influence on the morphology and on the alignment of ZnO nanorods. Further the optical properties of nanostructures were investigated by photoluminescence (PL) spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy. The PL spectrum divulged a continuous suppression of defect-related broadband emission by increasing the concentration of the KMnO4, which produced the quenching of surface defects present in the nanorods. The intensity ratio of the peaks corresponding to near-band emission (NBE) to that of deep-level emission of the KMnO4-modified ZnO nanorods was found to increase by eightfold of magnitude. Further it must be noted that nearly 17-fold enhancement in the PL emission of the peak corresponding to NBE was observed in KMnO4-modified ZnO compared to the ZnO grown without any additive. The I-V plot showed dependence of current values under dark and illumination over the amount of KMnO4 added during the growth stage.[GRAPHICS].