電鍍成長鎳金多層一維奈米結構於氧化鋁模板之製程

Fabrication of Ni/Au multilayered nanowire arrays in anodic aluminum oxide

陳星達(Sing-Da Chen)

指導教授 ： 蔡哲正

國立清華大學/工學院/材料科學工程學系/碩士(2011年)

https://doi.org/10.6843/NTHU.2011.00309

摘要

Abstract
Fabrication of one-dimensional nanowires has been researched for many years. Furthermore the multilayered nanowires were also synthesized to investigate their fundamental properties for various applications. By use of Anodic Alumina Oxide (AAO) as template, the nanowires synthesized by electrochemical method could be fabricated in large scale with low cost and high throughput.

In this work, Ni/Au multilayered nanowires were synthesized by dual-bath method. Ni layers were deposited by electrodeposition and Au layers were produced by Galvanic replacement. The structures were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), and their magnetic properties were characterized by Vibrating Sample Magnetometer (VSM). The results shown that a sharp Ni/Au interface and regular structures with nanowire diameter of ca. 265 nm is obtained. The diffraction pattern of Ni layer indicated that the nanowires is polycrystalline structures. Magnetic measurement by VSM showed that easy-magnetic directions are dominated by shape anisotropy of Ni layers.

Diffusion behavior between Ni/Au layers were also studied by annealing at high temperatures. X-Ray diffractometer (XRD) was used to identify the phases after annealing. The results showed that NiAu metastable phase appeared at 650 oC accompanying with NiO phase. The NiO is due to oxidation of Ni at high temperature during venting the chamber. Annealing at 750 oC caused agglomeration of Au atoms and the XRD cannot detect NiAu phase. Besides, the NiAu phase tends to separate at 750 oC. Magnetic measurement also showed a decrease of coercive field as the annealing temperature rises.

關鍵字

陽極氧化鋁 ； 電鍍 ； 鎳金

並列摘要

無資料

並列關鍵字

AAO ； electrodeposition ； NiAu

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