Electrochemical deposition of (Mn, Co)-codoped ZnO nanorod arrays without any template
Electrochemical deposition of (Mn, Co)-codoped ZnO nanorod arrays without any template
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无模板的(Mn,Co)共掺杂ZnO纳米棒阵列的电化学沉积
DOI：
10.1016/j.elecom.2007.03.012
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发表时间：
2007-07
影响因子：
5.4
通讯作者：
Qu, Dun-Lin
中科院分区：
文献类型：
--
作者：
Tong, Ye-Xiang;Zhao, Wen-Xia;Li, Gao-Ren;Qu, Dun-Lin
(Mn在温度为90°C的0.5mol/l ZnCl 2 -0.01mol/l MnCl 2 - 0.01mol/l CoCl 2 - 0.1mol/l KCl-0.05mol/l酒石酸溶液中，通过电化学自组装在铜基底上成功制备了（Co）共掺杂的ZnO纳米棒阵列，发现这些纳米棒沿c轴方向取向，具有纤锌矿结构。能量色散X射线光谱和X射线衍射表明，掺杂剂Mn和Co被纳入ZnO的纤锌矿结构。掺杂剂的浓度以及纳米棒的取向和密度可以容易地通过沉积的电流密度或盐浓度来很好地控制。磁化强度测试表明，所制备的（Mn，Co）共掺杂ZnO纳米棒的磁化强度约为91 Oe，饱和磁化强度（Ms）约为0.23emu/g。研究了在0.5mA/cm ~ 2电流密度下，在0.5mol/lZnCl_2 - 0.01mol/lMnCl_2 - 0.01mol/lCoCl_2 -0.1mol/lKCl-0.05mol/l酒石酸溶液中制备的（Mn，Co）共掺杂ZnO纳米棒阵列的各向异性磁性，计算出易磁化轴由平行向垂直转变的时间约为112 min。各向异性的磁性，取决于棒的几何形状和密度，可以解释在纳米棒之间的自退磁和静磁耦合之间的竞争。
(Mn,Co)-codoped ZnO nanorod arrays were successfully prepared on Cu substrates by electrochemical self-assembly in solution of 0.5mol/l ZnCl2–0.01mol/l MnCl2–0.01mol/l CoCl2–0.1mol/l KCl–0.05mol/l tartaric acid at a temperature of 90°C, and these nanorods were found to be oriented in the c-axis direction with wurtzite structure. Energy dispersive X-ray spectroscopy and x-ray diffraction show that the dopants Mn and Co are incorporated into the wurtzite-structure of ZnO. The concentrations of the dopants, and the orientations and densities of nanorods can easily be well controlled by the current densities of deposition or salt concentrations. Magnetization measurement indicates that the prepared (Mn,Co)-codoped ZnO nanorods with a coercivity of about 91Oe and a saturation magnetization (Ms) of about 0.23emu/g. The anisotropic magnetism for the (Mn,Co)-codoped ZnO nanorod arrays prepared in solution of 0.5mol/l ZnCl2–0.01mol/l MnCl2–0.01mol/l CoCl2–0.1mol/l KCl–0.05mol/l tartaric acid with current density of 0.5mA/cm2was also investigated, and the crossover where the magnetic easy axis switches from parallel to perpendicular occurs at a calculated time of about 112min. The anisotropic magnetism, depending on the rod geometry and density, can be explained in terms of a competition between self-demagnetization and magnetostatic coupling among the nanorods.
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