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Optical characterization of ZnO nanoparticles and nanorods Prepared by wet chemical technique at low temperature

机译:低温湿化学法制备ZnO纳米颗粒和纳米棒的光学表征

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Zinc Oxide nanoparticles and nanorods have been synthesized at an optimum temperature of 60°C using aqueous solution of zinc acetate and potassium hydroxide in methanol. Particle and rod like structures were obtained by merely varying the relative concentration of the reagents. A variety of techniques like UV-Vis absorption spectroscopy, X-ray diffraction (XRD), photoluminescence, Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) were used to carry out structural and spectroscopic characterizations. FTIR confirms the preparation of zinc oxide. XRD shows the formation of well crystalline nature and wurtzite structure of prepared zinc oxide samples. Grain sizes were also calculated using XRD data and found to be in 11-15nm range for all preparations. Presence of one-dimensional structures in the rod samples were confirmed by SEM images. Blue shift of the absorption peaks were found due to quantum confinement of excitons. Capping action of polyvinyl pyrrolidone (PVP) was also studied. Use of PVP leads to the decrement in aspect ratio of rods but provides spherical shaped nanostructures. Enhancement of UV-emission intensity with suppression of green emission intensity was observed by the use of PVP during preparation.
机译:使用乙酸锌和氢氧化钾的甲醇水溶液在60°C的最佳温度下合成了氧化锌纳米颗粒和纳米棒。仅通过改变试剂的相对浓度即可获得颗粒和棒状结构。各种技术(例如UV-Vis吸收光谱法,X射线衍射(XRD),光致发光,傅立叶变换红外(FTIR)光谱和扫描电子显微镜(SEM))用于进行结构和光谱表征。 FTIR证实了氧化锌的制备。 XRD显示所制备的氧化锌样品的良好结晶性质和纤锌矿结构的形成。还使用XRD数据计算了晶粒尺寸,发现所有制剂的晶粒尺寸在11-15nm范围内。通过SEM图像确认了棒样品中一维结构的存在。由于激子的量子限制,发现了吸收峰的蓝移。还研究了聚乙烯吡咯烷酮(PVP)的封端作用。 PVP的使用导致杆的纵横比减小,但是提供了球形的纳米结构。通过在制备过程中使用PVP,可以观察到UV发射强度的增强和绿色发射强度的抑制。

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