研究生: |
蘇冠宇 Kuan-Yu Su |
---|---|
論文名稱: |
場離子顯微鏡研究 (1)量測覆銥單原子針場發射與場離子電流 (2)鈮(100)表面觀察 Study using field ion microscope (1)Measuring field emission current and field ion current of Ir covered single atom tip (2)Direct observations of Nb(100) surfaces |
指導教授: |
傅祖怡
Fu, Tsu-Yi 黃英碩 Hwang, Ing-Shouh |
學位類別: |
碩士 Master |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 85 |
中文關鍵詞: | 覆銥鎢針 、法拉第杯 、場離子電流 、場發射電子電流 、多晶鈮針 、鎢 、鈮 |
英文關鍵詞: | Ir covered W tip, Fraday cup, field ion current, field emission current, Nb tip, tungsten, niobium |
論文種類: | 學術論文 |
相關次數: | 點閱:328 下載:7 |
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覆銥單晶鎢針經數次加熱退火長成金字塔結構後,以法拉第杯與微通道板量測金字塔結構的場離子電流與場發射電子電流。對場發射電流而言,針形的尖銳度比金字塔結構的影響更大。離子電流的起始電壓是由針型尖銳度影響,飽和離子電流由金字塔結構影響,且發現微通道板量測飽和離子電流時的放大倍率約為法拉第杯量測的5000倍。多晶鈮針在數次加熱退火後,(100)面確實產生皺化。
Using Fraday cup and MCP (microchannel plate) measured field emission currents and field ion currents after Ir covered single crystal tungsten tips form pyramid strcture. Tip’s shape affects field emission current more then pyramid strcture. Threshold voltage of field evaporation is affected by sharpness of tip. Satuaration ion current is affected by pyramid structure. Satuaration ion current which is measured with MCP is bigger then satuaration ion current which is measured with Faraday cup 5000 times. Nb {100} can be faceting because Nb{310} expands after annealing.
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