• 제목/요약/키워드: ultra-sharp tungsten electrode

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멀티채널 방식에 의한 초미세 바늘 전극의 제작 및 빔 특성 (Manufacture of an Ultra-Sharp Tungsten Electrode for Field-Emission Electron Beam and Its Beam Characteristics)

  • 임연찬;현정우;김성수;박철우;이종항;강승언
    • 한국공작기계학회:학술대회논문집
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    • 한국공작기계학회 2004년도 춘계학술대회 논문집
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    • pp.508-512
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    • 2004
  • An ultra-sharp tungsten electrode for field emission was manufactured by using an electrochemical etching method, and its beam characteristics were investigated. KOH and NaOH were the electrolytes used in this research, and the taper length of the tip varied form 150 $\mu\textrm{m}$ to 250 $\mu\textrm{m}$ according to the applied voltage and the concentration of the electrolyte. The electron-beam stability was measured to be within 5% for a total emission current of 5 ${\mu}\textrm{A}$ during 4 hours of operation, and the Ignition voltages were found to be ∼300 V. The tip radius was experimentally found to be 250${\AA}$ from a linear fitting of Fowler-Nordheim plots, which was in remarkably good agreement with that of the image size from scanning ion-microscopy.

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