Cd1-xMnxS稀磁半导体纳米线的制备和研究  

Preparation and Characterisation of Cd1-xMnxS Nanowires

作　　者：陈佩赓[1] 孙玲伟[1] 高有辉[1] 

机构地区：[1]北京师范大学物理系,北京100875

出　　处：《纳米科技》2010年第5期42-45,共4页

基　　金：中央高校基本科研专项资金项目（No.101-105113）; 教育部科学技术研究重点项目（No.109025）

摘　　要：采用多孔氧化铝模板,通过直流电化学沉积法成功制备出不同掺杂浓度的Cd1-xMnxS纳米线,用XRD、SEM、HRTEM对纳米线的成分、形貌、结构进行了系统分析,并用SQUID对样品进行了磁性测量,结果表明,制得的Cd1-xMnxS纳米线呈单晶CdS纤锌矿结构,而且沿002方向有择优取向性,没有发现其它含Mn的化合物生成。从ZFC/FC曲线看出样品的居里温度接近于室温,且在低温处存在奇异现象。45K和300K下测量的的M-H曲线显示磁滞现象,测得的矫顽力分别是300Oe和100Oe,说明样品具有铁磁性。样品的紫外-可见光反射谱显示Cd1-xMnxS纳米线的吸收边并不随掺杂浓度x单调变化,而是随着掺杂量的增大能隙先减小后增大。掺杂度在1%处能隙有最小值。Cd1-xMnxS nanowires with different doping ratio have been fabricated by DC eletrodeposion with AAO template. Microstructures of the nanowires have been studied by the X -ray diffraction （ XRD）, scanning electron microscopy （SEM） , and high-resolution transmission electron microscopy （HRTEM）, respectively. Magnetic properties of the sample have been investigated by superconducting quantum interference device （ SQUID）. It is found that the all Cd1-xMnxS nanowires show single crystal structure of wurtzite CdS-type with [002] along the axis direction of the nanowires. Other Mn compounds are not observed from XRD patterns and TEM analysis. The samples indicate a room temperature ferromagnetism inferred from the ZFC-FC and M-H measurements, and coercivities of 300 Oe and 100 Oe are obtained at 45 K and 300 K. Reflection spectra of UV - visible spectrophotometer demonstrates that the absorption edge strongly depends on the doping ratio x.

关 键 词：Cd1-xMnxS纳米线 AAO模板 直流电化学沉积 

分 类 号：TB383[一般工业技术—材料科学与工程]