Schottky emitters with carbon nanotubes as electron source

Phan Ngoc Minh, Nguyen Tuan Hong, Ngo Quang Minh, Phan Hong Khoi, Yuka Nomura, Takahito Ono, Masayoshi Esashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

In this paper we present a simple approach for making a Schottky emitter with Carbon Nanotubes (CNTs). A tungsten wire of 0.3 mm diameter was used as a heating filament. An iron rod of 0.3 mm diameter having a sharp tip was weld-bonded to the filament. By heating the filament to around 750°C in a mixture of (C2H2+Ar), multi-wall CNTs was grown at the Fe tip. Electron field emission and thermal-field emission properties of the fabricated Schottky emitter were measured at different temperatures. At room temperature, the field emission current well obeyed the Fowler-Nordheim (F-N) mechanism with threshold voltage of around 0.2 V/μm. At the temperature of higher than 780°C, the thermal-field emission dominated and both field emission and thermal-field emission were very stable with very low fluctuation. Enhancement factor of 1.3 ×107 m-1 and work function of 4.95 eV were evaluated for the grown CNTs. The mentioned CNT-Schottky emitters for advanced electron beam instruments are expected.

Original languageEnglish
Title of host publicationTRANSDUCERS '05 - 13th International Conference on Solid-State Sensors and Actuators and Microsystems - Digest of Technical Papers
Pages267-270
Number of pages4
Publication statusPublished - 2005 Nov 9
Event13th International Conference on Solid-State Sensors and Actuators and Microsystems, TRANSDUCERS '05 - Seoul, Korea, Republic of
Duration: 2005 Jun 52005 Jun 9

Publication series

NameDigest of Technical Papers - International Conference on Solid State Sensors and Actuators and Microsystems, TRANSDUCERS '05
Volume1

Other

Other13th International Conference on Solid-State Sensors and Actuators and Microsystems, TRANSDUCERS '05
CountryKorea, Republic of
CitySeoul
Period05/6/505/6/9

Keywords

  • CNTs
  • Electron sources
  • Field emission
  • Schottky emission

ASJC Scopus subject areas

  • Engineering(all)

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