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首页> 美国卫生研究院文献>Materials >Determination of Activation Overpotential during the Nucleation of Hcp-Cobalt Nanowires Synthesized by Potentio-Static Electrochemical Reduction
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Determination of Activation Overpotential during the Nucleation of Hcp-Cobalt Nanowires Synthesized by Potentio-Static Electrochemical Reduction

机译：恒电位电化学还原法合成Hcp-钴纳米线成核过程中活化超电势的测定

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The crystal growth process and ferromagnetic properties of electrodeposited cobalt nanowires were investigated by controlling the bath temperature and cathodic overpotential. The cathodic overpotential during electrodeposition of cobalt nanowire arrays, ΔEcath, was theoretically estimated by the difference between the cathode potential, Ecath, and the equilibrium potential, Eeq, calculated by the Nernst equation. On the other hand, the activation overpotential, ΔEact, was experimentally determined by the Arrhenius plot on the growth rate of cobalt nanowire arrays, Rg, versus (vs.) reciprocal temperature, 1/T. The ferromagnetic cobalt nanowire arrays with a diameter of circa (ca.) 25 nm had the preferred crystal orientation of (100) and the aspect ratio reached up to ca. 1800. The average crystal grain size, Ds, of (100) peaks was estimated by X-ray diffraction patterns and was increased by decreasing the cathodic overpotential for cobalt electrodeposition by shifting the cathode potential in the noble direction. Axial magnetization performance was observed in the cobalt nanowire arrays. With increasing Ds, coercivity of the film increased and reached up to ca. 1.88 kOe.
机译：通过控制浴温和阴极超电势，研究了电沉积钴纳米线的晶体生长过程和铁磁性能。从理论上通过阴极电势E cath 与平衡电势E 之差估算钴纳米线阵列电沉积过程中的阴极过​​电势ΔE cath eq ，由能斯特方程式计算得出。另一方面，激活超电势ΔE act 是通过Arrhenius图通过实验确定的，钴纳米线阵列的生长速率Rg相对于（相对于）反向温度1 / T。直径约为（约）25 nm的铁磁钴纳米线阵列的首选晶体取向为（100），长径比达到约。 1800.通过X射线衍射图估计（100）个峰的平均晶粒尺寸Ds，并通过使阴极电势向贵金属方向移动来减少钴电沉积的阴极过电势而增加了平均晶粒大小Ds。在钴纳米线阵列中观察到轴向磁化性能。随着Ds的增加，薄膜的矫顽力增加，并达到约。 1.88科

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