Cu-Co共掺杂ZnO稀磁半导体的水热法制备与性能

Preparation and properties of Cu and Co co-doped ZnO dilute magnetic semiconductors by hydrothermal method

采用水热法了制备不同掺杂比例的Zn0.95Cu0.05-xCoxO(x=0,0.025,0.05)稀磁半导体材料。X射线衍射(XRD)表明所有样品具有结晶良好的纤锌矿结构,随着Co掺杂量的增加点阵常数有所增大。高分辨透射电子显微镜(HRTEM)发现所有样品形貌为纳米棒状结构,分散性良好。X射线能量色散分析仪(EDS)测试结果说明样品中Cu2+、Co2+是以替代的形式进入ZnO晶格中。光致发光光谱(PL)研究发现在所有样品中都存在较强的紫外发光峰、蓝光发光峰和绿光发光峰,而且峰位发生蓝移。振动样品磁强计(VSM)研究结果表明掺杂样品在室温条件下存在具有铁磁性。

Diluted magnetic semiconductors Zn0. 95Cu0. 05- xCoxO with different consistency ratio（ x = 0,0. 025,0. 05） were synthesized by hydrothermal method. The X-ray diffraction（ XRD） results reveal that all samples synthesized by this method possess wurtzite structure with good crystallization,with the increase of Co concentration the lattice constant of doped samples slightly lightly increases. Highresolution transmission electron microscopies（ HRTEM） discover the morphology is nanorod and well dispersed. X-ray energy dispersive spectrometries（ EDS） indicate Cu^2 ＋and Co^2 ＋successfully substituted for the lattice site of Zn^2 ＋. Photoluminescence spectra（ PL）experiment results observe strong ultraviolet emission peaks,blue emission peaks and green emission peaks,and the spectra occur blue shift. The vibrating sample magnetometer（ VSM） results show the doped samples possess ferromagnetic at room temperature.