Systematic study of He induced nano-fiber formation of W and other period 6 transition metals

Ueda, Y.; Yamashita, N.; Omori, K.; Lee, H.T.; Ibano, Kenzo; Ito, Atsushi

doi:10.1016/j.jnucmat.2018.04.024

Cited by 22 publications

(17 citation statements)

References 14 publications

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“…10,11) potential of usage of helium (He) plasmas to metallic materials have been identified between these ten years. The He irradiation effect of nanostructuring metal surfaces was first identified in tungsten (W) 12) and later on in other metals including molybdenum, 13) titanium (Ti), 14) tantalum, iron, 15) rhenium, iridium, 16,17) rhodium, and ruthenium. 18) Although formation mechanism has yet to be fully understood, it is recognized that formed He nanobubbles by He ion bombardment play important roles for the growth of fiberform nanostructures.…”

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confidence: 99%

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂

Kajita¹,

Tomita²,

Yasunaga³

et al. 2019

Jpn. J. Appl. Phys.

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Ethylene decomposition via photocatalytic reaction using ultra-violet light was performed using an oxidized titanium (Ti) sheet and/or thin film samples fabricated by helium (He) plasmas treatments. We prepared nanostructured Ti samples formed by He plasma irradiation and additional thin film deposited samples using radio frequency magnetron sputtering. The samples prepared in this study had a slightly lower photocatalytic activity compared to the thin film deposited on tungsten nanostructure samples previously reported; the anatase formation was solely identified on Ti sheet samples and is hopeful for further improvement of photocatalytic activity of plasma treated titania.

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confidence: 99%

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂

Kajita¹,

Tomita²,

Yasunaga³

et al. 2019

Jpn. J. Appl. Phys.

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“…The FN growth was identified on various metals that have body centered cubic (BCC) crystal structures such as W, face centered cubic (FCC), and hexagonal close packing (HCP) crystal structures; Table I summarizes metals on which the growth of FNs was identified, as was discussed in Refs. [14][15][16][17]. The He-plasma-induced FN growth was clearly observed on twelve metals as far as we know: six of them [W, molybdenum (Mo), iron (Fe), tantalum (Ta), vanadium (V), and niobium (Nb)] have BCC crystal structure, four of them [iridium (Ir), rhodium (Rh), nickel (Ni), and platinum (Pt)] have FCC crystal structure, and two of them [rhenium (Re) and ruthenium (Ru)] have HCP crystal structure.…”

Section: Introductionmentioning

confidence: 99%

Growth of nano-fibers on HCP-metals by He plasma irradiation

Kajita

Nojima

Yamamoto

et al. 2020

Jpn. J. Appl. Phys.

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Morphology changes by helium plasma irradiation are investigated on four metals that have hexagonal close packing crystal structures. Straight fiberform nanostructures (FNs) were identified on rhenium. Detailed transmission electron microscopy observations of the rhenium nanostructures revealed that crystal orientation alters on locations where fibers bent. On bending locations, well-grown nanobubbles were observed or the fibers became very narrow. Parameter dependences of morphology changes are revealed on three of them (cobalt, hafnium, and zirconium). It is shown that various morphology changes such as nanocones, pinholes, pillars, and FNs occur by the helium plasma irradiation. Based on the temperature desorption spectroscopy analysis, we will discuss the behavior of He atoms and morphology changes.

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“…Fuzzy nanostructure changes several surface physical characteristics, e.g., high light absorptivity [3] and large surface area [4] due to an increase of the porosity [5]. Further, similar nanostructures are also found to be formed on other metals such as iron [6], vanadium [7], platinum, and so on [8][9][10]. In order to utilize the unique characteristics of the fuzzy surface for an industrial application field, morphology-change conditions of several metals are energetically being surveyed.…”

Section: Introductionmentioning

confidence: 99%

Characterization of He Induced Nanostructures Using SEM Image Analysis<sup> </sup>

Tanaka

Kajita

Ohno

2019

Plasma and Fusion Research

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Helium induced nanostructures on tungsten were characterized by applying basic statistical analysis techniques to scanning electron microscope (SEM) images. As the analysis targets, pinhole-and fuzz-dominant surfaces irradiated with different ion fluences were employed. Although two-dimensional Fourier analysis of the normalized brightness of SEM images clarified several characteristic features, their differences are small to distinguish the dominant nanostructures. On the other hand, probability density functions (PDFs) of the normalized brightness indicate that hole-and fuzz-dominant surfaces have long tail and Gaussian-like shape, respectively. By using several indexes with considering the black and white saturation, it was found that kurtosis and Kullback-Leibler divergence could provide reasonable judgement as the characterization index.

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Systematic study of He induced nano-fiber formation of W and other period 6 transition metals

Cited by 22 publications

References 14 publications

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂

Growth of nano-fibers on HCP-metals by He plasma irradiation

Characterization of He Induced Nanostructures Using SEM Image Analysis<sup> </sup>

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Systematic study of He induced nano-fiber formation of W and other period 6 transition metals

Cited by 22 publications

References 14 publications

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO2

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO2

Growth of nano-fibers on HCP-metals by He plasma irradiation

Characterization of He Induced Nanostructures Using SEM Image Analysis<sup> </sup>

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Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂

Photocatalytic decomposition of ethylene using He plasma induced nano-TiO₂