Stabilities in field electron emissions from noble‐metal covered W nano‐tips: apex structure dependence

Itagaki, T.; Rokuta, Eiji; Kuo, Hong Shi; Nomura, Kazuya; Ishikawa, Tsuyoshi; Cho, B.-L.; Hwang, Ing−Shouh; Tsong, Tien T.; Oshima, C.

doi:10.1002/sia.2437

Cited by 6 publications

(8 citation statements)

References 18 publications

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“…The beam diameter is often defined as the full width half maximum (FWHM), which is measured to be ∼7 mm, corresponding to an opening angle (2θ ) of only 2.4 • . This value is similar to those obtained by Oshima et al on several noble-metal covered W(111) single-atom tips [22][23][24] and significantly smaller than those reported by Kuo et al [19][20][21]. The projection image through the sample holder also exhibits a similar narrow beam profile, as seen in figure 2(b), when the tip is 4 mm away from the sample.…”

Section: Methodssupporting

confidence: 89%

A fully coherent electron beam from a noble-metal covered W(111) single-atom emitter

et al. 2009

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In quantum mechanics, a wavefunction contains two factors: the amplitude and the phase. Only when the probing beam is fully phase coherent, can complete information be retrieved from a particle beam based experiment. Here we use the electron beam field emitted from a noble-metal covered W(111) single-atom tip to image single-walled carbon nanotubes (SWNTs) in an electron point projection microscope (PPM). The interference fringes of an SWNT bundle exhibit a very high contrast and the fringe pattern extends throughout the entire beam width. This indicates good phase correlation at all points transverse to the propagation direction. Application of these sources can significantly improve the performance and expand the capabilities of current electron beam based techniques. New instrumentation based on the full spatial coherence may allow determination of the three-dimensional atomic structures of nonperiodic nanostructures and make many advanced experiments possible.

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Section: Methodssupporting

confidence: 89%

A fully coherent electron beam from a noble-metal covered W(111) single-atom emitter

et al. 2009

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“…20 They fabricated apex structures terminated with a single atom, three atoms, and ten atoms, by a field evaporation technique using a FIM apparatus, and observed the FE current fluctuation of these three apexes. 4͑b͒, 4͑c͒, 5͑b͒, 5͑c͒, and 6͑b͒, fluctuation increased with time.…”

Section: A Noise Characteristics Of Nanotip Fe Currentmentioning

confidence: 99%

Low fluctuation and drift of field emission currents emitted from Pd/W nanotips

Akamine

Fujiwara

Oshima

et al. 2011

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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The authors have observed the fluctuation and drift of field emission ͑FE͒ current from nanotips fabricated by the deposition of Pd under extreme high vacuum and subsequent annealing at ϳ1000 K. Observed fluctuations of 0.02%-1% for 100 h at ϳ10 nA were extremely low when compared with those of conventional FE guns ͑a few percent͒. From a practical point of view, drifts in FE current were negligible over several hours. When the Pd layer had been removed by repeated heating and FE operation, Pd redeposition on the tip apex was necessary for their restoration.

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“…Since the collapse tip of Pd-W was also active for chemisorption with residual gases in comparison with the SAT tips, electron emission was also fluctuated [9]. In fact, the SAT tip of Pd-W showed extremely low fluctuation, less than 1% at 1 nA in the initial stage of reconstruction and slight fluctuation, a few % after 500-h operation [4].…”

Section: Repeated Collapse and Successive Reconstructionmentioning

confidence: 99%

Thermal Stability of Single-Atom Termination at a Pyramidal Apex of an Ir-W Tip

Oshima

Tomitori

Shimoda

et al. 2018

e-J. Surf. Sci. Nanotech.

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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 thermodynamically stable only under negative electric bias in the temperature rang below 1300 K. If the SAT tip was broken accidentally, it was repaired for many times only by heating at the negative bias. The demountable character of the SAT tip was also confirmed.

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Stabilities in field electron emissions from noble‐metal covered W nano‐tips: apex structure dependence

Cited by 6 publications

References 18 publications

A fully coherent electron beam from a noble-metal covered W(111) single-atom emitter

A fully coherent electron beam from a noble-metal covered W(111) single-atom emitter

Low fluctuation and drift of field emission currents emitted from Pd/W nanotips

Thermal Stability of Single-Atom Termination at a Pyramidal Apex of an Ir-W Tip

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