Ahmed Faheem, Kumar Shalendra, Arshi Nishat, Anwar M S, Koo Bon Heun, Lee Chan Gyu
School of Nano and Advanced Materials Engineering, Changwon National University, Changwon, Gyeongnam, 641-773, Korea.
J Nanosci Nanotechnol. 2012 Feb;12(2):1386-9. doi: 10.1166/jnn.2012.4631.
We have successfully synthesized large-scale aggregative flowerlike Zn1-xCo(x)O (0.0 < or = x < or = 0.07) nanostructures, consisting of many branches of nanorods at different orientations with diameter within 100-150 nm (tip diameter approximately 50 nm) and length of approximately 1 microm. The rods were prepared using Zinc nitrate, cobalt nitrate and KOH in 180 Watt microwave radiation for short time interval. The synthesized nanorods were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), field emission transmission electron microscopy (FETEM) and DC magnetization measurements. XRD and TEM results indicate that the novel flowerlike nanostructures are hexagonal with wurtzite structure and Co ions were successfully incorporated into the lattice position of Zn ions in ZnO matrix. The selected area electron diffraction (SAED) pattern reveals that the nanorods are single crystal in nature and preferentially grow along [0 0 1] direction. Magnetic studies show that Zn1-xCo(x)O nanorods exhibit room temperature ferromagnetism. This novel nanostructure could be a promising candidate for a variety of future spintronic applications.
我们成功合成了大规模的聚合花状Zn1-xCo(x)O（0.0≤x≤0.07）纳米结构，其由许多不同取向的纳米棒分支组成，直径在100 - 150纳米之间（尖端直径约50纳米），长度约为1微米。这些纳米棒是使用硝酸锌、硝酸钴和氢氧化钾在180瓦微波辐射下短时间制备而成的。使用X射线衍射（XRD）、场发射扫描电子显微镜（FESEM）、场发射透射电子显微镜（FETEM）和直流磁化测量对合成的纳米棒进行了表征。XRD和TEM结果表明，这种新型花状纳米结构为具有纤锌矿结构的六方晶系，且钴离子成功掺入了ZnO基体中锌离子的晶格位置。选区电子衍射（SAED）图谱显示纳米棒本质上是单晶，且优先沿[0 0 1]方向生长。磁性研究表明，Zn1-xCo(x)O纳米棒表现出室温铁磁性。这种新型纳米结构可能是未来各种自旋电子学应用的有前途的候选材料。
