Nanowires from Aligned One-dimensional Arrays of Co Nanoclusters on Al2O3 Grown on Vicinal NiAl Surfaces

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研究生：	黃絜詠 Jie-Yung Huang
論文名稱：	Nanowires from Aligned One-dimensional Arrays of Co Nanoclusters on Al2O3 Grown on Vicinal NiAl Surfaces
指導教授：	羅夢凡 Meng-Fan Luo
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 物理學系 Department of Physics
畢業學年度：	96
語文別：	英文
論文頁數：	80
中文關鍵詞：	穿隧電子顯微儀、鈷奈米團簇、傾斜表面、氧化鋁薄膜
外文關鍵詞：	Co nanocluster, vicinal surface, Al2O3, STM
相關次數：	點閱：10 下載：0
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本篇論文我們利用金屬自主性排列方式，方便地組成金屬奈米線綜合體。我們採用 NiAl(100)平面往 [010] 方向傾斜小角度得到階梯表面，此樣品經由氧化過程，得到有序氧化鋁薄膜區域，在此區域中有突起的結構會沿著 [001] 方向，且它的長度可以到微米尺度。而進一步地利用氣相沉積方法，將鈷奈米團簇成長在氧化鋁薄膜上，而鈷奈米團簇會優先依著有序氧化鋁薄膜區域的突起結構來排列( 沿著 [001] 方向來延展 )，然後得到一維奈米金屬線，其寬度小於三奈米、長度高達至微米尺度。

We present a simple, self-organized approach for synthesis of arrays of supported metal nanowires. By oxidizing NiAl surfaces vicinal to the (100) plane titled along the crystallographic direction [010], we produce ordered θ-Al2O3 thin-films exhibiting highly uniform protrusion stripes which propagate uniquely in crystallographic direction [001] of the NiAl and attain length of micrometer-scale. These protrusions are preferential nucleation centres for vapor-deposited metal; the nanoclusters grown from vapor-deposited metal are thus aligned and form one-dimensional arrays along the [001] direction. The Co cluster arrays form readily nanowires with a width as small as 3 nm and length up to micrometers.

Abstract in Chinese.......................................i
Abstract.................................................ii
Acknowlegments .........................................iii
Contents ................................................iv
List of Figures..........................................vi
List of Tables ...........................................x
Chapter1 Introduction.....................................1
Chapter2 Literature Survey ...............................4
2.1 Properties of NiAl..................................4
2.2 Phases of Al2O3 grown on NiAl.......................6
2.3 Co nanoclusters deposited on Al2O3/NiAl(100) ......12
2.4 Vicinal surfaces...................................15
Chapter3 Experimental Instrument and Procedures..........17
3.1 Ultrahigh Vacuum (UHV) System......................17
3.1.1 Introduction of vacuum.........................17
3.1.2 UHV System.....................................17
3.1.3 Experimental Instruments.......................20
3.2 Scanning Tunneling Microscopy (STM) ...............24
3.2.1 Principle of STM ..............................24
3.2.2 Operation of STM...............................27
3.2.3 RHK-300 STM in experiment......................29
3.2.4 Preparing the STM tips.........................33
3.3 Low Energy Electron Diffraction (LEED).............35
3.3.1 Principle of LEED..............................35
3.3.2 Setup of LEED..................................37
3.4 Experimental Procedures............................38
3.4.1 Cleaning surface of vicinal NiAl(100) .........38
3.4.2 Exposure oxygen on the clean vicinal NiAl(100).39
3.4.3 Deposition of Co vapor on Al2O3 grown on vicinal
NiAl(100)......................................40
3.4.4 The measurement of STM and LEED................40
Chapter4 Results and Discussion..........................41
4.1 Cleaning NiAl(100) vicinal surfaces ...............41
4.1.1 Clean surface of NiAl(23,2,0) .................41
4.1.2 Clean surface of NiAl(38,1,0) .................43
4.2 Exposure oxygen on NiAl vicinal surfaces...........44
4.2.1 Exposure oxygen on NiAl(23,2,0)................44
4.2.2 Exposure oxygen on NiAl(38,1,0) ...............51
4.3 Deposition of Co vapor on Al2O3/ NiAl(100) vicinal
surfaces...........................................58
4.3.1 Deposition of Co vapor on Al2O3/ NiAl(23,2,0)..58
4.3.2 Deposition of Co vapor on Al2O3/ NiAl(38,1,0)..61
Chapter5 Conclusion and Future Work......................63
Reference................................................64

                                

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