以掃描穿隧電子顯微鏡及光激發能譜研究奈金屬粒子在氧化鋁薄膜上的成長

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姓名

田明翰(Ming-Han Ten) 查詢紙本館藏

畢業系所

物理學系

論文名稱

以掃描穿隧電子顯微鏡及光激發能譜研究奈金屬粒子在氧化鋁薄膜上的成長
(STM and PES studies of metal nano-clusters on thin film Al2O3/ NiAl (100))

相關論文

★ 鐵電型液晶材料光熱相變研究	★ An AFM study of thermal behavior of lipid over layers on mica
★ 利用RHEED、LEED、AES 研究Al2O3在NiAl(100)和Co在Al2O3/NiAl(100)上的幾何結構和生長方式	★ Patterning Co Nanoclusters on Thin Film Al2O3/NiAl(100)
★ Growth of Oxide on NiAl(100) and its Interaction with Au	★ 用原子力顯微鏡在脂質膜上做微影術並且討論其在基板上之動力行為
★ Catalytic properties of Au nanoclusters supported on Al2O3/NiAl (100) surface	★ Atomic Structures and Electro-catalytic Properties of Pt Nanoclusters on Thin Film Al2O3/NiAl(100)
★ Nanowires from Aligned One-dimensional Arrays of Co Nanoclusters on Al2O3 Grown on Vicinal NiAl Surfaces	★ 在氧化鋁上成長金與白金的和金奈米粒子
★ 以第一原理研究一到二顆金原子在θ型氧化鋁(001)表面上的吸附與擴散行為	★ 甲醇在以thita-三氧化二鋁/鎳鋁合金為基板之奈米黃金粒子上的分解反應-以熱脫附質譜術與傅立葉紅外光譜儀方法之研究
★ 探測θ-Al2O3/NiAl(100)表面之下的結構以及Au-Pt雙金屬顆粒在θ-Al2O3/NiAl(100)表面上的形貌	★ 利用穿隧式電子顯微鏡的探針產生在鎳鋁合金(100)面上的局部氧化反應
★ 利用PES探討吸附物對Au-Pt奈米團簇所引發表面發生重構的現象	★ 在氧化鋁上成長碳六十薄膜及在氧化鋁上成長金-白金合金團簇並曝上甲醇

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摘要(中)

我們分別以掃描穿隧電子顯微鏡(STM)研究奈米金粒子以及同步輻射光源的光激發電子能譜儀(PES)研究白金奈米粒子在氧化鋁薄膜上的成長. 我們在超高真空系統中, 利用物理氣象沉積法將奈米粒子成長在300 K, 450 K, 和 570K 的完整有序氧化鋁薄膜Al2O3/NiAl(100)上. 從STM圖形可以觀察到,金奈米粒子在低鍍量時以二維的模式成長.而在較高的樣品準備溫度(450 K和570 K), 則會出現準二維以及較大的三維奈米金粒子共存.
以同步輻射光源的光激發電子能譜儀(PES)研究白金奈米粒子在氧化鋁薄膜上的成長.白金奈米粒子的束縛能隨著升高的樣品溫度往高能量方向偏移.這指出白金奈米粒子可能形成氧化態的粒子.甲醇吸附在白金上當樣品溫度大約120 K時, 然後退火到不同的高溫.我們可以發現到甲醇分解成碳氫化合物在大約380 K時, 而且表面上的汙染物會減少甲醇的分解.

摘要(英)

We have studied the Au nano-clusters on the well defined support by using scanning tunneling microscopy (STM) and Pt nano-clusters by using synchrotron-based high-resolution photoemission spectroscopy (PES). The nano-clusters were vapor deposited on the well-ordered Al2O3 grown on NiAl (100) in the ultrahigh vacuum environment at 300 K, 450 K, and 570 K (600K for Pt). The STM images show that the Au nano-clusters form two-dimensional (2D) clusters at small coverage. At the elevated sample prepare temperature, the quasi-2D (height of 1 – 2 atomic layers) and greater three–dimensional clusters coexist.
We studied Pt nano-clusters on the well-ordered Al2O3 by using PES. The Pt 4f binding energy (BE) shifts to higher values with the sample temperature. This implies that the Pt clusters are oxidized at the higher sample temperature. The methanol was adsorbed on Pt clusters at 120 K and subsequently annealed to different temperatures. The methanol decomposes to hydrocarbon at sample temperature of annealing to 380 K. The amount of adsorption methanol was decreased with the increasing contamination.

關鍵字(中)

★ 白金
★ 掃描穿隧電子顯微鏡
★ 同步輻射光
★ 金
★ 氧化鋁

關鍵字(英)

★ PES
★ Al2O3
★ NiAl
★ STM
★ Pt
★ Au

論文目次

Chapter 1 Introduction-------------------1
Reference--------------------------------4
Chapter 2 Basic concepts-----------------6
2.1 Al2O3/NiAl(100)----------------------6
2.1.1 The properties of NiAl (100)-------6
2.1.2 θ-Al2O3 growth on NiAl (100)------7
2.2 Metal clusters growth on oxide surface--9
2.2.1 Interaction of metal with oxide film--11
2.2.2 Literature survey for Au and Pt clusters on oxide surface-------------------------------------12
2.3 Energy application from Methanol--------13
2.3.1 The Chemical reaction for methanol----13
2.3.2 The thermodynamic for methanol reaction and adsorption----------------------------------15
Reference-----------------------------------19
Chapter 3 Introduction to the Instruments---23
3.1 Ultrahigh Vacuum (UHV) system-----------23
3.1.1 STM system----------------------------24
3.1.2 XPS system----------------------------25
3.2 Scanning Tunneling Microscopy (STM)-----26
3.3 X-ray photoelectron spectroscopy (XPS)--30
3.4 Experimental Methods--------------------33
3.4.1 clean sample--------------------------33
3.4.2 The growth of θ-Al2O3----------------35
3.4.3 Metal deposition on Al2O3-------------36
3.4.4 Methanol adsorption and decomposition-36
Reference-----------------------------------38
Chapter 4 Results and discussions-----------39
4.1 Growth of Au Nano-cluster on Al2O3/NiAl(100)--39
4.2 Methanol decomposition on Pt/Al2O3/NiAl(100)--49
4.2.1 PES study for Pt/Al2O3/NiAl (100)-----49
4.2.2 Methanol adsorption and decomposition on Pt/Al2O3/NiAl (100)-------------------------57
Reference-----------------------------------71
Chapter 5 Conclusions-----------------------74

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指導教授

羅夢凡(Meng-Fan Luo)

審核日期

2009-1-22

推文