GdCo纳米管阵列的电化学制备及其形貌和性能表征.docx

内蒙古大学硕士学位论文 径越小、沉积液浓度大越容易成实心线状结构，模板孔径越大、沉积液浓度小 越容易成空心线状结构。EDS分析确定纳米线／管是由Gd和Co组成。通过XR D和TEM测量说明退火前的纳米线／管为非晶结构，经退火后重新结晶形成多晶 结构。通过磁性能的测量表明，Gd-Co纳米管随沉积电压降低其易磁化轴由平 行于纳米管方向翻转为垂直于纳米管。这是因为随着沉积电位降低，沉积速率 增大，沉积相同时间纳米管长度变大，同时强磁性元素Gd的含量增加，因此G d—Co纳米管间的静磁耦合作用能增加，从而使形状各向异性起决定作用逐渐转 变为静磁耦合作用起决定作用。退火后的纳米管被晶化，磁性能提高。而且随 着退火温度增高，矫顽力、饱和磁化强度均变大。 关键词：Gd．Co合金纳米线／管；直流电沉积；氧化铝模板；磁各向异性； 晶体结构 II 万方数据  内蒙古大学硕士学位论文 MORPHOLOGY AND PROPERTIES OF GD—CO NANOTU『BE／WIRE AR R AYS PREPARED BY ELECTRODEPOSITION M匝THODS AB STRACT Because nanotubes and nanowires have the unique structure and properties，in recent years they have gradually become the important study in the field of materials， chemistry,and electronics．The controllable preparation and the research on nanotubes and nanowires become difficulty due to their unique structure．Since the anodic aluminum oxide template(AAO)has advantages of well—ordered pore，simple preparation and low-cost，it has been widely used in research．As a fast，easy to operate，efficient，repeatable method of synthesis，electrochemical deposition with its unique advantages becomes an effective way for the preparation of nanomaterials and has great prospects． In this paper,Gd—Co nanotubes and nanowires with a uniform diameter are fabricated into AAO template by using direct current chemical deposition method． The morphology of samples is characterized by scanning electron microscope(SEM) and transmission electron microscope(TEM)，and the compositions are confirmed by energy dispersive spectrometry(EDS)．The crystalline structure is measured by X—ray diffraction(XRD)and selected area electron diffraction(SEAD)．Finally,the magnetic properties of nanotubes and nanowires obtained under various conditions are tested at room temperature by comprehensive physical property measurement system(PPMS)． III 万方数据  内蒙古大学硕士学位论文 In the experiment，AAO templates are obtained by a two-step anodization method from hi曲purity aluminum foil．The pore size of AAO template is controlled by changing the