Thermally Stable Metal and Superconducting Material Nanotips: Fabrication and Field Emission Characteristics

• Main Authors: Hou, Jin-Long, 侯勁龍
• Other Authors: Fu, Tsu-Yi
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/qzervj

博士 === 國立臺灣師範大學 === 物理學系 === 105 === 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.