金的催化特性已經被廣泛研究。其中在本校化學系蔣老師的研究中，利用熱脫附質譜(temperature programmed desorption, TPD) 與反射式紅外光吸收光譜(reflection absorption infrared spectra, RAIR) 發現有機化學分子丙醛在低溫180 K 曝於金(110) 表面時，會形成丙醛的三聚物。因此在本研究中以低能量電子繞射儀(low energy electron deffraction, LEED) 與掃描式穿隧顯微技術(scanning tunneling microscopy, STM) 取得丙醛吸附於金表面時的表面資訊。且利用殘留氣體分析儀(residual gas analyzer, RGA) 補足無法直接量測樣品表面溫度的困難，藉
此我們間接取得恰當的曝氣溫度。而在LEED 圖樣上得到的特殊週期與以DFT 模型所計算出來的結果顯示，當丙醛有序吸附於金(110) 表面時會呈現傾斜約64度至71度的結構。而STM 的結果也顯示出當有吸附作用時，表面會有如同貓爪痕般的溝槽，且有吸附的原子列會變寬。目前樣品表面的溫度量測仍然有改善空間，故之後須由更多實驗加以驗證。

The catalytic properties of gold have been widely investigated. In Dr. Chao-Ming Chiang’s study, department of chemistry of NSYSU, they found that the organic molecules, propanal, form heterocyclic 2, 4, 6- triethyl-1, 3, 5-trioxane ring on Au(110) missing row surface at 180 K by temperature programmed desorption (TPD) and reflection absorption infrared spectra (RAIR). In this study, we used low energy electron diffraction (LEED) and scanning tunneling microscopy (STM) to study the detailed catalytic process on surface. Residual gas analyzer (RGA) was used to measure the thermal desorption of the propanal on Au(110) at 130 K and 185 K. This can be used to calibrate the temperature on the surface, which can not be directly measured by the thermal couple on the manipulator. The combination between the LEED pattern from the experiment and the DFT model shows the propanal adsorbed on the inclined plane with about 64 deg. to 71 deg. companing the (110) plane. The STM results also show that some of the surface after adsorption have trench wider atomic rows. In our experiment, the real temperature of the sample was not exactly determined. More experiments need to be taken to confirm the temperature.

1. 簡介1
1.1. 金(110) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. 丙醛(propanal) 及其三聚物. . . . . . . . . . . . . . . . . . . . . . . 6
2. 實驗儀器與方法9
2.1. 系統儀器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.1. 實驗環境-超高真空系統(Ultra high vacuum, UHV) . . . . . 10
2.1.2. 真空計(Gauge) . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1.3. 真空幫浦(Pump) . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.2. 量測儀器. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.2.1. 掃描式穿隧顯微鏡(Scanning tunneling microscope, STM) . . 14
2.2.2. 低能量電子繞射(Low energy electron diffraction, LEED) . . 20
2.2.3. 殘餘氣體分析儀(Residual gas analyzer, RGA) . . . . . . . . . 24
2.3. 實驗方法. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
3. 實驗結果與討論27
3.1. 殘留氣體分析儀結果討論. . . . . . . . . . . . . . . . . . . . . . . . . 27
3.2. 低能量電子繞射儀結果討論. . . . . . . . . . . . . . . . . . . . . . . . 43
3.3. 掃描式穿隧顯微鏡儀結果討論. . . . . . . . . . . . . . . . . . . . . . 52
4. 結論61
A. 附錄63
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