Design and fabrication of Ni nanowires having periodically hollow nanostructures.
Design and fabrication of Ni nanowires having periodically hollow nanostructures.
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DOI：
10.1039/c4nr02625j
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发表时间：
2014-09
期刊：
影响因子：
6.7
通讯作者：
Takao Sada;T. Fujigaya;N. Nakashima
中科院分区：
文献类型：
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作者：
Takao Sada;T. Fujigaya;N. Nakashima
我们提出了一个概念的设计和制造的金属纳米线具有周期性的中空纳米结构内的孔的阳极氧化铝（AAO）膜使用牺牲金属。在这项研究中，镍（Ni）和银（Ag）分别用作基础金属和牺牲金属。在-0.4 V和-1.0 V之间交替施加电势，在直径为18或35 nm的Ni-Ag“条形码”纳米线中提供交替沉积的Ni和Ag片段。在蚀刻掉Ag段后，我们制备了具有12 ± 5.3 nm纳米孔的Ni纳米线。这样的纳米结构的形成是通过在Ag片段的表面上形成Ni壳层来解释的，这是由于Ni（2+）对AAO的内表面的强亲和力。Ni壳层允许Ni片段甚至在Ag片段溶解之后保留。由于电镀条件容易控制，我们可以仔细调整周期性中空纳米空间的尺寸和间距。我们还描述了一种通过在Ni-Ag条形码纳米线上形成Ag壳而不是Ni壳来制造Ni纳米棒的方法，其中在电镀之前用带有硫醇基团的化合物修饰AAO表面的内部。
We propose a concept for the design and fabrication of metal nanowires having periodically hollow nanostructures inside the pores of an anodic aluminum oxide (AAO) membrane using a sacrificial metal. In this study, nickel (Ni) and silver (Ag) were used as the base metal and the sacrificial metal, respectively. Alternating an applied potential between -0.4 and -1.0 V provided alternatively deposited Ni and Ag segments in a Ni-Ag 'barcode' nanowire with a diameter of 18 or 35 nm. After etching away the Ag segments, we fabricated Ni nanowires with nanopores of 12 ± 5.3 nm. Such nanostructure formation is explained by the formation of a Ni shell layer over the surface of the Ag segments due to the strong affinity of Ni(2+) for the interior surfaces of AAO. The Ni shell layer allows the Ni segments to remain even after dissolution of the Ag segments. Because the electroplating conditions can be easily controlled, we could carefully adjust the size and pitch of the periodically hollow nanospaces. We also describe a method for the fabrication of Ni nanorods by forming an Ag shell instead of a Ni shell on the Ni-Ag barcode nanowire, in which the interior of the AAO surfaces was modified with a compound bearing a thiol group prior to electroplating.