掺杂浓度对Co掺杂ZnO纳米棒的铁磁性的影响  

The impact of doping concentration on the magnetic properties of Co-doped ZnO nanorods

作　　者：闫海龙[1] 王金斌[2] 钟向丽[2] 许军旗[1] 余本海[1] 肖桂灵[1] 

机构地区：[1]信阳师范学院物理电子工程学院,河南信阳464000 [2]湘潭大学低维材料及其应用技术教育部重点实验室,湖南湘潭411105

出　　处：《光电子．激光》2012年第3期523-526,共4页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(10802072;11004167;11072208);教育部新世纪人才基金(NCET-08-0687);信阳师范学院博士科研启动基金(KYQD201001)资助项目

摘　　要：采用化学气相沉积(CVD)方法制备出3种掺杂浓度的Co掺杂ZnO纳米棒。使用EDX(en-ergy dispersive X-ray)能谱,测得3种ZnO纳米棒中Co元素的掺杂浓度分别为0.4、1.4和2.4%。X射线衍射(XRD)分析表明,三个样品均为ZnO的六方铅锌矿结构,并沿着c轴取向择优生长。磁化曲线显示,掺杂浓度为0.4%的Co掺杂ZnO纳米棒为顺磁性,随着掺杂浓度的增大,Co掺杂ZnO纳米棒转变为铁磁性。扩展X射线吸收精细结构谱表明,Co掺杂ZnO纳米棒的铁磁性源于ZnO纳米棒中的Co金属团簇。Co-doped ZnO nanorods are fabricated by the chemical vapor deposition method. Via the energy dispersive X-ray analysis, the molar ratios of three samples are 0.4 %, 1.6 % and 2.4 %. The Co-doped ZnO with doping concentration of 2.4% is still regular nanorods. ZnO nanorods with a doping concentration of 0. 4~ show a paramagnetic behavior. X-ray diffraction patterns show that the co-doped ZnO nanorods are wurtzite structure of ZnO. With the increment of doping concentration, Co-doped ZnO nanorods show ferromagnetic characteristic instead of the paramagnetic behavior. The X-ray absorption fine structure results suggest that the room-temperature ferromagnetism of co-doped ZnO nanorods originates from the Co cluster phases.

关 键 词：Co掺杂ZnO纳米棒 稀磁半导体 X射线吸收精细结构 铁磁性 

分 类 号：O472.5[理学—半导体物理]