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| 研究生： |
白順元 Shun-Yuan Pai |
|---|---|
| 論文名稱： |
用掃描穿隧顯微術觀察硫醇在金(111)面上的有序結構 STM observation of ordered structures on alkanethiols/Au(111) surfaces |
| 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： | 2004 |
| 畢業學年度： | 92 |
| 語文別： | 中文 |
| 論文頁數： | 50 |
| 中文關鍵詞： | 掃描穿隧顯微術 、金(111) 、硫醇 |
| 外文關鍵詞： | STM, Au(111), alkanethiols |
| 相關次數： | 點閱：2 下載：0 |
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我們的實驗使用Au(111)單晶與金球的Au(111)以浸泡CH3(CH2)7SH與CH3(CH2)11SH溶液的方式，吸附上CH3(CH2)7SH與CH3(CH2)11SH的自我組裝分子薄膜。使用STM觀察的結果，表面呈現很密集的約2.5□深的黑色坑洞與約1.0□深的黑色的網狀分布，且可以發現( )R30o與c(4 2)的結構，與文獻上所報導的一致。在黑色坑洞中存在有序的分子排列，因此黑色坑洞為單原子層的凹陷。隨著浸泡硫醇溶液時間的增加，黑色坑洞的密度也跟著增加，單晶與金球均可以得到同樣的結果。此外，在實驗中也發現到，我們用穿隧阻抗較大或穿隧電流較小時，可以得到解析度較好的STM影像。
By immersion into octanethiol (CH3(CH2)7SH) and dodecanethiol (CH3(CH2)11SH) solutions, self-assembled monolayers (SAMs) of molecules are observed to form on both types of Au(111), single crystal and surface on flame-annealed gold ball, by scanning tunneling microscopy (STM). These ordered structures are consisted of dark pits, 2.5□ in depth, )R30o and c(4 2) superlattices, and dark mesh, 1.0□ in depth, between them. SAMs are also observed in the dark pits. Thus, the dark pits are confirmed to be craters of monatomic layer in depth. All these observations are consistent with the reports in literature. The density of dark pits are found to increase with immersion time on both types of Au(111) surfaces. The structures of SAMs can be well resolved by STM only when higher tunneling impedances or lower tunneling currents are applied.
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