研究生: |
侯勁龍 Hou, Jin-Long |
---|---|
論文名稱: |
熱穩態金屬與超導材料奈米針:製備與場發射特性 Thermally Stable Metal and Superconducting Material Nanotips: Fabrication and Field Emission Characteristics |
指導教授: |
傅祖怡
Fu, Tsu-Yi 黃英碩 Hwang, Ing-Shouh |
學位類別: |
博士 Doctor |
系所名稱: |
物理學系 Department of Physics |
論文出版年: | 2017 |
畢業學年度: | 105 |
語文別: | 中文 |
論文頁數: | 84 |
中文關鍵詞: | 鈮奈米針 、熱穩態形貌 、功函數 、場發射電流 |
英文關鍵詞: | niobium nanotip, thermally stable configuration, work function, field emission current |
DOI URL: | https://doi.org/10.6345/NTNU202203292 |
論文種類: | 學術論文 |
相關次數: | 點閱:123 下載:19 |
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本研究以超高真空場離子顯微鏡研究超導材料奈米針的特性。我們使用鈮發展了一套可靠的熱穩態奈米針製程,其針頂分佈形貌為{100}、{310}、{110}、{123} 與{111}面排列而成,且在<100>軸向形成四個{310}面環繞擴張而堆疊的奈米凸起,此結構可作為一個收斂的場發射束使用。經過氖氣或氙氣不同覆量的鋪覆後發現可降低{100}面的功函數,其中使用氖氣可降至最低的功函數條件為5朗繆爾,其值為3.63±0.08 eV,使用氙氣可降至最低的功函數條件為1.7朗繆爾,其值為3.50±0.04 eV,並此最佳條件下均可增加場發射電流的穩定性。此熱穩態的鈮奈米針結構在經過氧氣的場效蝕刻過程後,依然可藉由熱處理而再次重現。最後我們也討論了其他材料系統的熱穩態奈米針特性。
The characteristics of superconducting material nanotip is studied with UHV field ion microscope. We present a reliable method for a niobium tip with the thermally stable configuration of the cap part consists of {100}、{310}、{110}、{123} and {111}. The <100> directional nano-protrusion surrounded by four {310} facets can be used as a self-collimated field electron emitter. After exposing Ne or Xe gas at different coverage, the work function of {100} decreased to minima of 3.50±0.04 eV for Xe (1.7 Langmuir) and 3.63±0.08 eV for Ne (5 Langmuir); moreover, the field emission current stability was enhanced. The thermally stable configuration of Nb nanoemitter can be regenerated by thermal treatment from field-assisted oxygen etching process. Finally, we also discussed the characteristics of other thermally stable nanotip systems.
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