Nano-tendril bundles behavior under plasma-relevant electric fields

Kulagin, V.V.; Sinelnikov, D. N.; Bulgadaryan, D. G.; Efimov, N. E.; Kurnaev, V.А.; Hwangbo, Dogyun; Ohno, Noriyasu; Kajita, Shin

doi:10.1016/j.vacuum.2020.109799

Cited by 5 publications

(3 citation statements)

References 36 publications

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“…This morphology change suggests that these thin tips are the main emission sites for electric field emissions. A numerical calculation shows that the temperature of NTBs can increase to thousands of K in a very short time (several nanoseconds) at explosive emission, and an electric field of 2 kV mm −1 is sufficient to destroy the tip structure [25], which is consistent with the results of this experiment. Changing the impurity gas species and its ratio would change the sputtering yield on W sample, which is an important factor to determine the morphology of NTBs.…”

Section: Discussionsupporting

confidence: 87%

“…Even though the number of NTBs formed on W4 was approximately twice that of the other samples, the lowest field emission current for W4 indicated that the ability of field emission of the thicker fibers was so weak that the field emission current was reduced to several μA. In [25], it was shown that the aspect ratio, which was calculated by using the length of the fiber to divide its radius, has a significant effect on the enhancement factor by simulation. In another previous study [30], the NTBs were annealed in an infrared furnace.…”

Section: Discussionmentioning

confidence: 97%

“…It has been known that the field emission property of NTBs is correlated with their morphology [25]. Furthermore, the morphology of NTBs is affected by many parameters such as the impurity gas type and its ratio [8].…”

Section: Introductionmentioning

confidence: 99%

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Field emission properties of nano-tendril bundles formed via helium plasma exposure with various additional impurity gases

Zhang

Kajita

Hwangbo

et al. 2023

Mater. Res. Express

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Nano-tendril bundles (NTBs) were formed via helium plasma exposure with various additional impurity gases, such as neon (Ne), nitrogen (N2), and argon (Ar). The sizes of the NTBs showed different distributions with different additional impurity gases. The field emission properties of the NTBs formed with various additional impurity gases were measured. The field-emission properties were significantly affected by the morphology of the NTBs, especially the tips of the fibers. In the Ne- and Ar-seeded cases, the NTBs were formed with sharp tips, and the onset electric field for field emission was ~1 kV/mm for all the NTB samples. The Ne-seeded samples showed the most rapid increase in the emission current. In the N2-seeded case, two types of NTBs were formed. The NTBs were formed with sharp tips when the ratio of N2 impurity gas was 2.1%. With an increase in the ratio to 3.0% or higher, the fibers of the NTBs became thicker and tips became rounder. In the Fowler–Nordheim (F-N) plot analysis, the field enhancement factor was approximately 6000–7000 without significant differences, for all NTBs with sharp tips. NTBs with round tips showed totally different field emission properties, as the emission current was only several μA, which is one-tenth of that for the other samples. This suggests that the local morphology of NTBs, especially the geometrical shape of the tips, and not the general size of NTBs, is the main factor in determining the field emission properties of NTBs.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 97%