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研究生: 黃穎祥
Ing-Shouh Hwang
論文名稱: 氧氣誘發銥(210)面皺化現象:金字塔結構銥單原子針的製備條件分析
Oxygen induced faceting of iridium (210):the optimum for Iridium Single-Atom Tip formation
指導教授: 傅祖怡
Fu, Tsu-Yi
學位類別: 碩士
Master
系所名稱: 物理學系
Department of Physics
論文出版年: 2007
畢業學年度: 95
語文別: 中文
論文頁數: 62
中文關鍵詞: 單原子針金字塔統計分析
英文關鍵詞: single-atom tips, pyramid, statistical approaches
論文種類: 學術論文
相關次數: 點閱:164下載:3
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  • 依據中央研究院物理所鄭天佐實驗室在氧誘發銥單原子針成長的最新研究成果,以統計分析方法,定性分析不同退火條件及氧被覆量等,對銥單原子針(210),{311},(110)三面金字塔奈米結構形成、對稱性、原子堆疊及面積比例偏差等重要議題的影響做全面性且客觀地評估,並嘗試找出最佳的單原子針成長條件。由分析結果顯示,當氧曝氣量為60 Langmuirs,以510℃退火5分鐘,能得到最佳的原子堆疊結構。

    In this study, we analyze the raw data taken by Prof. Tsong’s laboratory for preparation of iridium single-atom tips (Ir-SATs). The Ir-SATs formation is known a complex function of surface cleanness, annealing conditions and oxygen exposure. To find out the optimum condition, based on the experimental results, statistical approaches are used to systematically qualify the effects of processing parameters on the final results of Ir-SATs formation. According to the idealized atomic stacking model, we define the deviations of pyramidal symmetry, stacking ratio, and area ratio to objectively evaluate the perfectibility of the single-atom tip. The results indicate that an idealized Ir-SAT can be easily obtained if oxygen exposure is 60 L and after a 510℃/5 min. mild annealing.

    目錄 摘要 2 致謝 4 第一章 緒論 1-1單原子針尖的優勢性 7 1-2單原子針尖歷史簡介 8 1-3新型單原子針尖製備的研究動機 10 1-4場離子顯微鏡的優勢 11 1-5單原子針近期研究趨勢 11 第二章 實驗原理與裝置 2-1實驗原理 13 2-2實驗裝置 20 第三章 樣品製備 3-1 ㄇ形針架的製備 26 3-2 針尖的製備法 27 第四章 實驗結果與討論 4-1 Ir(210)面上皺化現象(金字塔)形成機制 30 4-2 場離子顯微鏡研究-Ir(210)面上鋪覆氧氣誘發 之金字塔現象研究 33 1. 退火溫度效應 37 2. 氧氣被覆量效應 51 3. 單原子針最佳成長條件 54 第五章 結論 59 參考資料 60

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