English  |  正體中文  |  简体中文  |  全文筆數/總筆數 : 60938/93635 (65%)
造訪人次 : 1246956      線上人數 : 55
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
搜尋範圍 查詢小技巧:
  • 您可在西文檢索詞彙前後加上"雙引號",以獲取較精準的檢索結果
  • 若欲以作者姓名搜尋,建議至進階搜尋限定作者欄位,可獲得較完整資料
  • 進階搜尋
    請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/42019

    題名: Substrate temperature effects on the electron field emission properties of nitrogen doped ultra-nanocrystalline diamond
    作者: Chen, Y. C.;Tai, N. H.;林諭男;Lin, I. N.
    貢獻者: 淡江大學物理學系
    關鍵詞: UNCD;Nitrogen doped;MPECVD
    日期: 2008-04-01
    上傳時間: 2010-08-10 09:44:25 (UTC+8)
    出版者: Elsevier
    摘要: For the purpose of improving the electron field emission properties of ultra-nanocrystalline diamond (UNCD) films, nitrogen species were doped into UNCD films by microwave plasma chemical vapor deposition (MPCVD) process at high substrate temperature ranging from 600° to 830 °C, using 10% N2 in Ar/CH4 plasma. Secondary ion mass spectrometer (SIMS) analysis indicates that the specimens contain almost the same amount of nitrogen, regardless of the substrate temperature. But the electrical conductivity increased nearly 2 orders of magnitude, from 1 to 90 cm− 1 Ω− 1, when the substrate temperature increased from 600° to 830 °C. The electron field emission properties of the films were also pronouncedly improved, that is, the turn-on field decreased from 20 V/μm to 10 V/μm and the electron field emission current density increased from less than 0.05 mA/cm2 to 15 mA/cm2. The possible mechanism is presumed to be that the nitrogen incorporated in UNCD films are residing at grain boundary regions, converting sp3-bonded carbons into sp2-bonded ones. The nitrogen ions inject electrons into the grain boundary carbons, increasing the electrical conductivity of the grain boundary regions, which improves the efficiency for electron transport from the substrate to the emission sites, the diamond grains.
    關聯: Diamond and Related Materials 17(4-5), pp.457-461
    DOI: 10.1016/j.diamond.2007.10.020
    顯示於類別:[物理學系暨研究所] 期刊論文


    檔案 大小格式瀏覽次數



    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - 回饋