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首页> 外文期刊>Journal of nanoscience and nanotechnology >Template Assisted Electrochemical Growth of Cobalt Nanowires: Influence of Deposition Conditions on Structural, Optical and Magnetic Properties
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Template Assisted Electrochemical Growth of Cobalt Nanowires: Influence of Deposition Conditions on Structural, Optical and Magnetic Properties

机译：模板辅助的钴纳米线电化学生长：沉积条件对结构，光学和磁性能的影响

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The influence of electrodeposition potential, pH, composition and temperature of the electrolytic bath on the structure of cobalt nanowires arrays electrodeposited into anodic aluminum oxide (AAO) porous membranes is reported. XRD, SEM, and TEM analysis were employed to characterize structural (crystal phase, crystallographic texture, and grain size), and morphological nanowire properties. It was confirmed that at pH 2 the electrodeposition potential has not influence on the preferred crystallographic orientation of the electrochemically grown Co nanowires. At pH 4 the electrodeposition potential controls the growth of cobalt nanowires along some preferential crystallographic planes. The electrolytic pH bath modulates the fcc or hcp phase exhibited by the cobalt nanowires. Single crystalline nanowires with a hcp phase strongly oriented along the (2021) crystallographic plane were obtained at pH 4 and at -1.1 V (vs. Ag/AgCl), a result not previously reported. High electrolytic bath temperatures contributed to improve the single crystalline character of the cobalt nanowires. The presence of chloride anion in the electrolytic bath also influenced on the structural properties of the resulting cobalt nanowires, improving their crystallinity. The optical reflectance of the samples shows a structure in the UV-blue region that can be assigned to the two-dimensional morphology arising in the shape of the almost parallel nanowires. Magnetic measurements showed that different electrodeposition potentials and electrolytic bath pH lead to different magnetic anisotropies on the nanowire array samples.
机译：报道了电沉积电势，pH，电解槽的组成和温度对电沉积在阳极氧化铝（AAO）多孔膜中的钴纳米线阵列结构的影响。使用XRD，SEM和TEM分析来表征结构（晶相，晶体织构和晶粒尺寸）以及形态学纳米线特性。可以确定的是，在pH 2时，电沉积电位不会影响电化学生长的Co纳米线的优选晶体学取向。在pH 4时，电沉积电位控制钴纳米线沿某些优先晶体平面的生长。电解pH浴可调节钴纳米线显示的fcc或hcp相。在pH 4和-1.1 V（vs. Ag / AgCl）下获得了具有沿（2021）晶面强取向的hcp相的单晶纳米线，该结果先前未报道。高电解浴温度有助于改善钴纳米线的单晶特性。电解浴中氯化物阴离子的存在也影响所得钴纳米线的结构性质，从而改善其结晶度。样品的光学反射率显示了在紫外蓝色区域中的结构，该结构可以归因于几乎平行的纳米线形状产生的二维形态。磁测量表明，不同的电沉积电位和电解浴pH值会导致纳米线阵列样品上的磁各向异性不同。

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