磁控奈米螺旋碳管運動之研究

利用鐵薄膜配合低濃度的二氧化錫溶液當催化劑，利用多次旋塗的方式，使二氧化錫均勻地分布於鐵薄膜之上，因此可以成長尺寸均一性高且產量高的奈米螺旋碳管，其直徑約落在3~5μm。成長的奈米螺旋碳管利用電子束蒸鍍的方式蒸鍍鉻與鎳使其具有導磁性，再將鍍鎳奈米螺旋碳管混合去離子水，利用超音波震盪器加以分散，再將此溶液滴入事前準備好的容器中作為觀測試片。觀測試片放置具有三軸電磁鐵的磁場裝置中，磁場強度為2.3mT。發現鍍鎳奈米螺旋碳管在一軸磁場狀態下，其運動模式為先轉向至與磁場垂直之方向，之後再原地擺動。而在兩軸磁場下且兩軸相位差90度，會產生旋轉磁場，使鍍鎳奈米螺旋碳管可以360度的轉動。當為Z軸與X軸驅動或是Z軸與Y軸驅動可使鍍鎳奈米螺旋碳管一邊轉動一邊移動。而進一步改變兩軸相位差的領先或落後，可使鍍鎳奈米螺旋碳管做往復的運動。改變電磁鐵的驅動頻率，可以發現在2~5Hz，移動速率會隨著頻率上升而上升，但到了6~11Hz呈現不規則的關係。比較不同尺寸的鍍鎳奈米螺旋碳管移動速率，比較螺距的大小以及與去離子水的接觸面積，可以發現螺距較大者且與水接觸面積較小者有著較快的速率，此外也在礦物油中進行實驗，因為礦物油具有較高的黏滯係數因此速率很慢。本實驗最快的速率可達到10.63(μm/s)在水中驅動頻率11Hz，最慢速率0.057(μm/s)在礦物油中驅動頻率4Hz。

關鍵字

成長奈米螺旋碳管；高良率；旋轉磁場；奈米機器人

並列摘要

The method grows carbon nanocoils(CNCs) by Fe thin film and low concentration SnO2 as catalyst. The result shows it can grow high yield rate and high production mass CNCs and their diameter are about 3~5μm. Evaporate Chromium and Nickel on the high yield rate CNCs to make them have permeability and name them swimming robots. Mix the Swimming robots with deionized water and disperse them by sonication. Then, drip the solution to the reservoir as observed sample. Put the sample on the device which has three axes electromagnet. The magnetic field strength is 2.3mT. The motion under one axis driving is to rotate swimming robots to the direction which is vertical to the magnetic field line and then swimming robots sway at this position. Under two axes driving and the phase difference is 90。, it will create rotating magnetic field to rotate the swimming robots. The swimming robots rotates and moves simultaneously under Z and X axes driving or Z and Y axes driving. Swimming robots move forward or backward by changing the phase difference. Change the driving frequency, it finds out that the speed is proportional to the driving frequency among 2~5Hz, however, it’s not regular among 6~11Hz. The different sizes of swimming robots have different speeds. It has shown the one has bigger pitch and smaller contact surface with water has higher speed. Besides, do this experiment in the mineral oil. In this study, the fastest speed is 10.63 (μm/s) in water at 11Hz and the lowest speed is 0.057(μm/s) in mineral oil at 4Hz.

並列關鍵字

CNCs ； high yield rate ； rotating magnetic field ； swimming robots

參考文獻

[1] W. R. Davis, R. J. Slawson, G. R. Rigby, "An unusual form of carbon, "Nature, vol. 171, pp. 756, 1953

[2] R. T. K. Baker, M. A. Barbber, P. S. Harris, F. S. Feates, R. J. Waite, "Nucleation and Growth of Carbon Deposits from the Nickel Catalyzed Decomposition of Acetylene," Journal of catalysis, vol. 26, pp. 51-62, 1972

[3] K. Hernadi, A. Fonseca, J. B. Nagy, D. Bernaerts, A. A. Lucas, "Fe-CATALYZED CARBON NANOTUBE FORMATION," Carbon, vol. 34, pp.1249-1257, 1996

[4] S. Motojima, M. Kawaguchi, K. Nozaki, H. Iwanaga, "Growth of regularly coiled carbon filaments by Ni catalyzed pyrolysis of acetylene, and their morphology and extension characteristics," Applied Physics Letters, Vol. 56, pp. 321-323, 1990

[5] M. Hillert, N. Lange, "The structure of graphite filaments," Z. Kristallogr. Vol. 111, pp. 24-34, 1958

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磁控奈米螺旋碳管運動之研究

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