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Field Assisted Reactive Gas Etching of Multiple Tips Observed using FIM.

Rezwan Ahmed1, Radovan Urban2, Mark Salomons3

  • 1Department of Molecular and Material Sciences, Kyushu University, Fukuoka 816-8580, Japan; Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba 305-0801, Japan.

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Summary
This summary is machine-generated.

This study presents a cost-effective method for fabricating multiple tungsten single atom tips (SATs). The technique enables simultaneous mass fabrication and characterization of numerous tips, advancing scientific research.

Keywords:
Field ion microscopyfield emissionnanotipssingle atom tipstungsten tips

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Fabricating single atom tips (SATs) is crucial for advanced microscopy and surface science applications.
  • Current methods for producing multiple tungsten (W) SATs can be complex and costly.
  • Developing efficient, scalable fabrication techniques for W SATs is an ongoing challenge.

Purpose of the Study:

  • To report a simple and cost-effective method for fabricating multiple tungsten single atom tips (SATs).
  • To demonstrate the simultaneous fabrication of multiple tips from both polycrystalline and single crystalline tungsten wires.
  • To facilitate mass fabrication and characterization of tungsten tips.

Main Methods:

  • Electrochemical etching of multiple tungsten tips in NaOH solution.
  • Controlled field-assisted reactive gas etching in vacuum using nitrogen and helium.
  • Application of common high voltage for simultaneous apex shaping of nanotips.

Main Results:

  • Successful fabrication of single atom tips (SATs) from W(111) and W(110) crystallographic orientations.
  • Achievement of trimer tips from W(111), indicating control over tip morphology.
  • Demonstration of simultaneous shaping of multiple tips towards single-atom apexes.

Conclusions:

  • The developed method offers a simplified process for etching multiple tungsten tips.
  • This technique facilitates the mass fabrication and characterization of numerous tungsten tips.
  • The findings represent a significant step towards scalable production of W SATs for scientific applications.