Directed self-assembly of nanorod networks: bringing the top down to the bottom up.
Directed self-assembly of nanorod networks: bringing the top down to the bottom up.
复制标题
纳米棒网络的定向自组装：从上到下到自下而上。
DOI：
10.1088/0957-4484/23/50/505302
复制
发表时间：
2012
期刊：
影响因子：
3.5
通讯作者：
Einsle JF
中科院分区：
文献类型：
--
作者：
Einsle JF
自组装电沉积纳米棒材料已被证明为从纳米光子学到生物传感和磁学的广泛研究提供了令人兴奋的前景。然而，到目前为止，在晶片上特定位置制备纳米棒的范围仅限于局部区域定义。此外，纳米棒高度的横向控制很少或没有。在这项工作中，我们提出了一种可扩展的方法，用于控制纳米棒在垂直方向上的生长以及它们的横向位置。聚焦离子束预图案化Au阴极层，然后在顶部形成阳极氧化铝（AAO）模板。当预图案化具有与AAO模板的孔间距相同的尺寸时，成功地生长单个纳米棒的线。此外，对于亚200 nm宽的特征，可以看出纳米棒高度与距非图案化阴极的距离之间的关系遵循遵循电沉积的法拉第定律的二次生长速率。这有助于与纳米棒的局部生长相结合的纳米棒高度的横向控制。
Self-assembled electrodeposited nanorod materials have been shown to offer an exciting landscape for a wide array of research ranging from nanophotonics through to biosensing and magnetics. However, until now, the scope for site-specific preparation of the nanorods on wafers has been limited to local area definition. Further there is little or no lateral control of nanorod height. In this work we present a scalable method for controlling the growth of the nanorods in the vertical direction as well as their lateral position. A focused ion beam pre-patterns the Au cathode layer prior to the creation of the anodized aluminium oxide (AAO) template on top. When the pre-patterning is of the same dimension as the pore spacing of the AAO template, lines of single nanorods are successfully grown. Further, for sub-200 nm wide features, a relationship between the nanorod height and distance from the non-patterned cathode can be seen to follow a quadratic growth rate obeying Faraday's law of electrodeposition. This facilitates lateral control of nanorod height combined with localized growth of the nanorods.