Sousa Célia T, Leitao Diana C, Ventura João, Tavares Pedro B, Araújo João P
IFIMUP and IN - Institute of Nanoscience and Nanotechnology, Faculty of Sciences, Universidade do Porto, Rua do Campo Alegre, 678, 4169-007, Porto, Portugal.
Nanoscale Res Lett. 2012 Mar 5;7(1):168. doi: 10.1186/1556-276X-7-168.
We report an innovative strategy to obtain cylindrical nanowires combining well established and low-cost bottom-up methods such as template-assisted nanowires synthesis and electrodeposition process. This approach allows the growth of single-layer or multi-segmented nanowires with precise control over their length (from few nanometers to several micrometers). The employed techniques give rise to branched pores at the bottom of the templates and consequently dendrites at the end of the nanowires. With our method, these undesired features are easily removed from the nanowires by a selective chemical etching. This is crucial for magnetic characterizations where such non-homogeneous branches may introduce undesired features into the final magnetic response. The obtained structures show extremely narrow distributions in diameter and length, improved robustness and high-yield, making this versatile approach strongly compatible with large scale production at an industrial level. Finally, we show the possibility to tune accurately the size of the nanostructures and consequently provide an easy control over the magnetic properties of these nanostructures.
我们报告了一种创新策略，该策略结合了成熟且低成本的自下而上方法，如模板辅助纳米线合成和电沉积工艺，以获得圆柱形纳米线。这种方法能够生长单层或多段纳米线，并能精确控制其长度（从几纳米到几微米）。所采用的技术会在模板底部产生分支孔，从而在纳米线末端形成枝晶。通过我们的方法，这些不需要的特征可以通过选择性化学蚀刻轻松从纳米线中去除。这对于磁性表征至关重要，因为这种不均匀的分支可能会在最终的磁响应中引入不需要的特征。所获得的结构在直径和长度上显示出极窄的分布，具有更高的稳健性和高产率，使得这种通用方法与工业规模的大规模生产高度兼容。最后，我们展示了精确调整纳米结构尺寸的可能性，从而能够轻松控制这些纳米结构的磁性。
