氧在Mo(110)表面上的吸附｜國立清華大學博碩士論文庫

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研究生：	鄒育奇 Yu-Qi Zou
論文名稱：	氧在Mo(110)表面上的吸附 Adsorption of oxygen on Mo(110) surface
指導教授：	羅榮立 Rong-Li Lo
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
論文出版年：	2006
畢業學年度：	94
語文別：	中文
論文頁數：	83
中文關鍵詞：	氧在Mo(110)表面上的吸附
外文關鍵詞：	Adsorption of oxygen on Mo(110) surface
相關次數：	點閱：44 下載：0
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以低能量電子繞射儀(LEED)和掃描穿隧顯微儀(STM)研究鉬(110)面上的氧吸附結構。在室溫下曝氧，低曝量時發現三種有序相表面結構，依次為0.25ML的(2x2)、0.5ML的(1x2)或(2x1)及0.75ML的(2x2)。在高曝量時，表面也存在著某種結構。實驗中在曝氧後進行400K和500K退火，可以獲得較清晰的繞射圖像，與分佈較均勻的表面結構。而在樣品溫度為400K及500K下進行曝氧動作，除了獲得更尖銳的LEED圖像外，在高曝量時會出現複雜LEED圖像，以及特殊的表面結構。這項研究還有另外一個目的，由於鎢和鉬金屬同為bcc結構，因此藉由這個機會，比較氧在鉬(110)面上與鎢(110)面上的吸附差異性。

The surface structures of oxygen adsorbed on Mo(110) was studied by low energy electron diffraction (LEED) and scanning tunneling microscopy (STM).At lower exposure of oxygen three phases of the surface structure were found at room temperature. They were 41ML-(2x2), 21ML-(1x2) or (2x1),and 43ML-(2x2) structures. Some complex structures appeared at high exposures. Sharper LEED patterns and uniform surface structures might be obstained after post-annealing to 400K and 500K.While exposing 400K or 500K Mo(110) to oxygen, we could obtain not only sharper LEED patterns but also complex LEED patterns and surface structures at high exposures. The research has another goal. Owing to the fact that W and Mo are metals of bcc structure, comparison of oxygen adsorption on Mo(110) with W(110) was carried out in the study.

摘要
第一章 導論........................................1
1 研究動機.............................................................................................................1
2 Mo(110)面介紹...............................................................................................2
3 氧在Mo(110)表面上吸附研究背景的介紹...................................................3
4 氧在Mo(110)表面上吸附原理概述...............................................................6
第二章 儀器工作原理................................7
1 掃描穿隧式顯微術(Scanning Tunneling Microscopy).............................7
1.1 前言.......................................................................................................7
1.2 量子穿隧效應原理...............................................................................8
1.3 穿隧電流.............................................................................................10
1.4 儀器基本架構原理.............................................................................13
1.5 實驗模式.............................................................................................18
2 低能量電子繞射(Low Energy Electron Diffration)...........................21
2.1 前言.....................................................................................................21
2.2 LEED之倒晶格空間...........................................................................21
2.3 LEED基本架構及操作原理...............................................................24
第三章 儀器介紹與實驗過程........................26
1 實驗環境....................................................................................................26
2 儀器介紹....................................................................................................29
2.1 Omicron 變溫掃瞄探針顯微儀(VT SPM)....................................29
2.2 Omicron SPECTALEED....................................................................32
3 實驗過程....................................................................................................32
3.1 STM探針的製備..............................................................................32
3.2 清潔步驟........................................................................................34
3.3 曝氧吸附程序................................................................................36
第四章 實驗結果與討論.........................37
1 以LEED觀察未曝氧與持續曝氧的Mo(110)面........................................37
1.1 腔體中氧對Mo(110)面影響..........................................................37
1.2 確認氧的STM影像..........................................................................38
1.3 Mo(110)面的氧運動......................................................................40
1.4 LEED持續觀察曝氧後的Mo(110)..................................................41
2 室溫下Mo(110)面上的氧吸附實驗........................................................46
2.1 Mo(110)上的低覆蓋率(2x2)結構................................................49
2.2 Mo(110)上(1x2)與(2x1)結構......................................................52
2.3 Mo(110)上的高覆蓋率(2x2)結構................................................60
2.4 Mo(110)上的高曝量......................................................................66
3 退火的影響..............................................................................................67
3.1 曝氧後退火....................................................................................68
3.2 加溫曝氧........................................................................................74
3.3 Mo(110)和W(110)氧吸附比較......................................................81
第五章 結論...................................83

                                

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