Robustness of tungsten single atom tips to thermal treatment and air exposure

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DOIResolve DOI: http://doi.org/10.1016/j.apsusc.2014.01.173
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TypeArticle
Journal titleApplied Surface Science
ISSN0169-4332
Volume300
Pages1621; # of pages: 6
SubjectExperiments; Gas industry; Ion sources; Nitrogen; Single crystals; Faceting; Field ion microscopy; Gas assisted etchings; Gas field ion sources; Single atoms; Atoms
AbstractExperiments aimed at assessing the robustness of nitrogen-etched, single-atom tips (SATs) prepared using W(1 1 1) single crystal wire were performed. Our experiments showed that single-atoms tips sustain minimal damage when exposed to atmospheric conditions and can be readily and quickly nitrogen-etched to single-atom tips thereafter. The SATs can be annealed at temperatures up to 1100 C with minimal shape changes. Moreover, annealing temperatures in excess of 1200 C resulted in an apex faceting which may prove important in further single-atom tip creation. Procedures for warming of the SATs from operating temperatures of 80 K were also evaluated to determine conditions that limit tip contamination. These results show that SATS could be fabricated in a dedicated vacuum system and subsequently transferred to other instruments where they would undergo a brief conditioning procedure to recover the single-atom apex configuration prior to being subjected to operating conditions.. © 2014 Elsevier B.V.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21272142
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Record identifierbf85b05e-65a5-49d4-9f02-ed0535b49a32
Record created2014-07-23
Record modified2016-05-09
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