2018
DOI: 10.1380/ejssnt.2018.294
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Thermal Stability of Single-Atom Termination at a Pyramidal Apex of an Ir-W Tip

Abstract: A single-atom termination (SAT) tip of Ir-W is one of the most promising candidates among various gas-fieldionization ion sources (GFIS) and field emission (FE) tips. In this work, we investigated thermal stability of the SAT tip with increasing the tip temperature. Above 1300 K, the SAT tip was destroyed, which was consistent with the surface phase transition of the monolayer Ir covered W(111) surface [J. J. Kolodziej, T. E. Madey, J. W. Keister, and J. E. Rowe, Phys. Rev. B 65, 075413 (2002)]. The SAT tip is… Show more

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Cited by 2 publications
(3 citation statements)
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“…The rapid formation of the nanopyramid by the TF-treatment is shown in Figure 16, and the extrication of the stagnation of the {211} side-face expansion happened due to the influence of the surface-free-energy anisotropy under the electric field. Recently, Oshima et al have demonstrated the thermal stability of the Ir-coated W nanopyramid and reported that the Ir-coated nanopyramid formation was achieved only at negative biases above the observable one of the FE-micrographs (VR was positive) in a temperature range below 1300 K [44]. The difference in behavior between the Ir-coated nanopyramid and the Pt-, Au-, and Pd-coated nanopyramids under electric fields is currently unknown.…”
Section: Anchoring Of Nm-coated Nanopyramid Onmentioning
confidence: 99%
“…The rapid formation of the nanopyramid by the TF-treatment is shown in Figure 16, and the extrication of the stagnation of the {211} side-face expansion happened due to the influence of the surface-free-energy anisotropy under the electric field. Recently, Oshima et al have demonstrated the thermal stability of the Ir-coated W nanopyramid and reported that the Ir-coated nanopyramid formation was achieved only at negative biases above the observable one of the FE-micrographs (VR was positive) in a temperature range below 1300 K [44]. The difference in behavior between the Ir-coated nanopyramid and the Pt-, Au-, and Pd-coated nanopyramids under electric fields is currently unknown.…”
Section: Anchoring Of Nm-coated Nanopyramid Onmentioning
confidence: 99%
“…After heating the W surface to remove impurities and ensure that pure W remains, FCC metals, such as Pd, Pt, Au, Ir, and Rh, can be deposited on a clean W tip, after which a faceting process is utilized to form a nanopyramid. Nanopyramids can be made using a variety of FCC metals on the top of BCC-structured W. Among several FCC metals, due to corrosion resistance to reactive gases and strong bonding between Ir and W, Ir/W tips can have the highest brightness, stability, and durability levels when oxygen-gas-based charged particle beams are generated (Jeng et al, 2010; Oshima et al, 2018). The most common way to manufacture such FCC-on-BCC tips is the electroplating method, in which the target FCC metal element is coated onto the tip after the removal of the oxide film in an electrolyte (Kuo et al, 2004, 2009).…”
Section: Introductionmentioning
confidence: 99%
“…The tip is reformed through a heat treatment in a state identical to the original state. Oshima et al (2018) introduced a method of creating an iridium (Ir) reservoir on the tip to increase the number of regenerations. In this method, the surface of the tip is heated to approximately 2,300 K in a vacuum to remove the oxide layer, after which the Ir reservoir is created in the lower part of the tip apex through the Ar-sputtering method or through laser spot welding.…”
Section: Introductionmentioning
confidence: 99%