Dixit Tejendra, Bilgaiyan Anubha, Palani I A, Singh Vipul
J Nanosci Nanotechnol. 2016 Apr;16(4):3254-61. doi: 10.1166/jnn.2016.12279.
Dumbbell and flower like ZnO nano-crystals were grown via hydrothermal process. The as-prepared dumbbells, with length of 0.8-10 µm and edge length of 0.3-0.8 µm possess a hexagonal structure, while flowers with lengths ranging from 1-6 µm with hexagonal structure have been synthesized. The effect of temperature, solution concentration and growth time on the size and shapes of the ZnO nanostructures has been studied using Field emission scanning electron microscope (FESEM) and X-ray diffractometer (XRD). Further the optical properties of nanostructures were investigated by Photoluminescence (PL) spectroscopy, which shows emission in UV and visible regions. From Diffused reflectance spectroscopic analysis (DRA) it was observed that ZnO nanodumbbells and nanoflowers have a direct band gap of 3.27 eV and 3.25 eV respectively. The I-V plot showed dependence of current values under dark and illumination over the annealing temperature during the growth stage. Thus we report a control over the shape and dimension of nanostructures by varying various parameters having implications for (opto)electronic devices.
通过水热法生长出哑铃状和花状的氧化锌纳米晶体。所制备的哑铃状晶体长度为0.8 - 10微米，边长为0.3 - 0.8微米，具有六方结构，而合成出的花状晶体长度在1 - 6微米之间，同样具有六方结构。利用场发射扫描电子显微镜（FESEM）和X射线衍射仪（XRD）研究了温度、溶液浓度和生长时间对氧化锌纳米结构尺寸和形状的影响。此外，通过光致发光（PL）光谱对纳米结构的光学性质进行了研究，该光谱显示在紫外和可见光区域有发射。从漫反射光谱分析（DRA）观察到，氧化锌纳米哑铃和纳米花的直接带隙分别为3.27电子伏特和3.25电子伏特。I - V曲线表明，在生长阶段，暗态和光照下的电流值与退火温度有关。因此，我们报告了通过改变各种对（光）电子器件有影响的参数来控制纳米结构的形状和尺寸。
