電解沉積製備鎳奈米線及其磁性研究

Preparation and Magnetic Properties of Electrodeposited Ni Nanorod Arrays

許臣翔(Chen-Hsiang Hsu) ； 李弘彬(Hung-Bin Lee) ； 李春穎(Chun-Ying Lee)

《臺北科技大學學報》 41卷2期 (2008/12) Pp. 23-29

https://doi.org/10.29768/JNTUT.200812.0002

摘要

藉由陽極氧化鋁模運用電化學沉積方法於胺基磺酸鎳系統製備鎳奈米線。經場發射電子顯微鏡顯示鎳奈米線直徑約75nm、長度約5~15μm，具高密度、高深寬比均勻且筆直度佳，由X光繞射儀分析結晶平面(111)、(200)、(220)為多晶結構，穿透式電子顯微鏡(TEM)觀察單一奈米線為鎳晶粒細小並含有看似差排結晶與雙晶缺陷。在溫度300K下，經震動樣品磁度儀(VSM)對鎳奈米線進行磁性量測，垂直底材方向(H(下標 ⊥))施加磁場，其矯頑磁力(coercivity, H(下標 c))為642 Oe，角形比(squareness, M(下標 r)/M(下標 s))為0.5，平行底材方向(H(下標 //))施加磁場，其矯頑磁力為129 Oe，角形比為0.064。結果顯示鎳奈米線的易磁化方向為奈米線軸向，並且比鎳塊材有較佳之磁化特性。

關鍵字

陽極氧化鋁模 ； 電解沉積 ； 鎳奈米線

並列摘要

In this study, the nickel nanorod arrays were fabricated by employing anodized aluminum oxide (AAO) template in the electrodeposition of sulfamate bath. Via the examination under field emission electron scanning microscope, the nanowires approximately had diameter of 75 nm and length of 5-15 μm. These nanorods were in high density, large aspect ratio and good straightness. The X-ray diffraction results showed the polycrystalline microstructure of the nanorods. In addition, there were likely dislocations and twins amid the crystalline structure observed in transmission electron microscope. Using the measurement of vibrating sample magnetometer (VSM) at temperature of 300 K, the coercivity Hc and squareness M(subscript r)/M(subscript s), in the direction perpendicular to the substrate (H(subscript⊥)), were 642 Oe and 0.5, respectively. While changing the measurement direction to parallel to substrate (H(subscript //)), the coercivity H(subscript c) and squareness M(subscript r)/M(subscript s) became 129 Oe and 0.064. It is shown that the nanorod has better magnetization than the bulk nickel material.

並列關鍵字

AAO template ； Electrodeposition ； Nickel nanorods