# Stable and high current emission of electrons from a HfC nanoneedle field-emitter fabricated by focused ion beam

https://mdr.nims.go.jp/datasets/a57cc3ae-2b7f-4839-b2b5-e10a8ec9f41e

## File

- [Stable and high current emission of electrons from a HfC nanoneedle field-emitter fabricated by focused ion beam.pdf](https://mdr.nims.go.jp/filesets/eb7ac0ee-4811-4fbd-9d48-98d71b667106/download) ([Detail](https://mdr.nims.go.jp/filesets/eb7ac0ee-4811-4fbd-9d48-98d71b667106.md))

## Id

a57cc3ae-2b7f-4839-b2b5-e10a8ec9f41e

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-04-09T08:14:05.694842Z

## Updated at

2025-04-11T23:30:10.343542Z

## Published at

2025-04-11T11:23:09.383294Z

## Doi

https://doi.org/10.48505/nims.5417

## First published url

https://doi.org/10.1016/j.vacuum.2025.114224

## Date published

2025-03-06

## Recorded date published

2025-8

## Resource type

journal_article

## Manuscript type

authors_original

## Collection



## Title

- title: Stable and high current emission of electrons from a HfC nanoneedle field-emitter
    fabricated by focused ion beam
  title_type: original
  lang: en

## Description

- description: HfC nanoneedles with both excellent electron emission characteristics
    and robust structure are promising field-emission point electron sources, especially
    for applications desiring a high emission current. Herewith we report successful
    fabrication of HfC nanoneedle emitter by focused ion beam and its characterization.
    Transmission electron microscopy and energy dispersive X-ray spectroscopy examinations
    show that the HfC nanoneedle has a sharp tip with a radius of curvature of about
    10 nm. Its atomic structure remains crystalline and it is aligned in a <100> direction.
    The HfC nanoneedle emitter has a low work function of 3.2 eV. It delivers an electron
    beam with a low turn-on field of 2.7 V/nm (at emission current of 2 nA) and a
    threshold field of 3.5 V/nm (at emission current of 50 nA), respectively. The
    HfC nanoneedle emitter also exhibits an excellent emission stability with a fluctuation
    of 1.5 % in 15 min under a high current (280 nA). The excellent current stability
    is attributed to the sharp tip lowering the extraction voltage that reduced ion
    bombardment and oxidation of the emitter surface with lowered activities in gas
    adsorption or desorption.
  description_type: abstract
  lang: und

## Creator

- name: Shuai Tang
  role: author
- name: Jie Tang
  role: author
  orcid: https://orcid.org/0000-0002-5871-5776
- name: Yimeng Wu
  role: author
- name: You-Hu Chen
  role: author
- name: Jun Uzuhashi
  role: author
  orcid: https://orcid.org/0000-0003-2023-8158
- name: Tadakatsu Ohkubo
  role: author
  orcid: https://orcid.org/0000-0003-3548-1951
- name: Masaki Takeguchi
  role: author
  orcid: https://orcid.org/0000-0002-0282-6020
- name: Lu-Chang Qin
  role: author

## Contact agent



## Publisher

organization: Elsevier BV

## Managing organization



## Keyword

- subject: electron emission
  schema: not_defined
- subject: transmission electron microscopy
  schema: not_defined
- subject: focused ion beam
  schema: not_defined

## Rights

- identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin



## Embargo



## Journal

- title: Vacuum
  issn: 0042207X
  volume: '238'
  article_number: '114224'

## Conference



## Related item



## Funding



## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: eb7ac0ee-4811-4fbd-9d48-98d71b667106
  filename: Stable and high current emission of electrons from a HfC nanoneedle field-emitter
    fabricated by focused ion beam.pdf
  content_type: application/pdf
  size: 914216
  md5: dcacbf24049242f794be971652ada02e

## Thumbnail

fileset_id: eb7ac0ee-4811-4fbd-9d48-98d71b667106
filename: Stable and high current emission of electrons from a HfC nanoneedle field-emitter
  fabricated by focused ion beam.pdf