Surface modification of titanium using He plasma

Kajita, Shin; Kitaoka, Daiki; Ohno, Noriyasu; Yoshihara, Reiko; Yoshida, N.; Yoshida, Tomoko

doi:10.1016/j.apsusc.2014.03.022

Cited by 42 publications

(46 citation statements)

References 29 publications

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“…On the other hand, when the surface temperature was lower than 1000 K, the fuzz structure was not formed, and a rough structure appeared on the surface. The lower limit surface temperature conditions for nanostructure formation were within about 0.3 to 0.4 of the melting point of WC that is 3143 K. Surface temperature dependence was consistent with other materials [1,2,4]. The formation conditions and the shape of the fuzz structure were similar to those of W formed at temperatures higher than about 1000 K [1].…”

Section: Methodssupporting

confidence: 78%

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Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Tomita

Kajita

Ohno

et al. 2018

Plasma and Fusion Research

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Fuzz nanostructure formation on metal by helium plasma irradiation has potential in industrial application due to the increasing in surface area. We have investigated the influence on the surfaces of platinum and tungsten carbide by helium plasma irradiation. On tungsten carbide, fuzz nanostructure was formed when the surface temperature was higher than 1000 K. However, when helium irradiation was conducted at the surface temperature of 940 K or higher, tungsten carbide changed to W possibly because of radiation enhanced sublimation. On platinum, fuzz nanostructure was formed when the surface temperature was in the range of 800 -1000 K and the fluence was on the order of 10 26 m −2 . The nanostructure formation mechanism of platinum should be similar to that of tungsten, but incubation fluence of platinum was higher and the growth rate of fuzzy layer was likely to be lower than those of tungsten.

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Section: Methodssupporting

confidence: 78%

“…The nanostructures are called "fuzz". The fuzz structures are formed on various metals such as molybdenum, titanium, iron, and vanadium; the needle-like nanostructures are also formed on silicon by the irradiation [1][2][3][4]. In addition, effects on the optical absorption have been reported due to the formation of nanostructures [5,6].…”

Section: Introductionmentioning

confidence: 99%

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Tomita

Kajita

Ohno

et al. 2018

Plasma and Fusion Research

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“…Similar closed pores microstructures can be found in ion-irradiated or ion-implanted thin films [17][18][19][20][21][22][23] which have been pointed out as fabrication routes for nanostructured materials and surfaces. [19][20][21][22][23][24][25] Generally these microstructures consist in few pores situated at a certain distance from the surface; while with our methodology, highly porous structures with uniform porosity from the substrate to the coatings surface are deposited, in a wide range of thicknesses (from 100 nm to few microns).…”

mentioning

confidence: 61%

“…[19][20][21][22][23][24][25] Generally these microstructures consist in few pores situated at a certain distance from the surface; while with our methodology, highly porous structures with uniform porosity from the substrate to the coatings surface are deposited, in a wide range of thicknesses (from 100 nm to few microns). From a fundamental point of view these new materials with embedded pores, filled with the sputtering gas, represent a new class of nanocomposite materials presenting on demand optical properties in comparison with the matrix film.…”

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confidence: 99%

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

2016

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Nanoporous silicon based materials with closed porosity filled with the sputtering gas have been recently developed by magnetron sputtering. In this work the physical properties (density and pressure) of molecular nitrogen inside closed pores in a SiO x N y coating are investigated for the first time using spatially resolved electron energy-loss spectroscopy (EELS) in a scanning transmission electron microscope. The paper offers a detailed methodology to record and process multiple EELS spectrum images (SIs) acquired at different energy ranges and with different dwell times. It is demonstrated an adequate extraction and quantification of the N-K edge contribution due to the molecular nitrogen inside nanopores. Core-loss intensity and N chemical bond state were evaluated to retrieve 2D maps revealing stable high density of molecular nitrogen (from 40 to 70 at./nm 3 ) in nanopores of different size (20 to 11 nm). This work provides new insights on the quantification of molecular N 2 trapped in porous nitride matrices that could be also applied to other systems.

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“…Figure 2 presents a He fluence dependence of the morphology change. [44,45] On Ti case, only nano-cones without FNs were formed on the surface by He plasma irradiation presumably due to sputtering. The irradiation times of Figure 2(a-c) were 1, 3, and 10 h, respectively.…”

Section: Morphology Changesmentioning

confidence: 98%

One‐Step Plasma Synthesis of Nb₂O₅ Nanofibers and their Enhanced Photocatalytic activity

et al. 2018

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Fiberform nanostructured niobium (Nb) was fabricated by one step helium (He) plasma irradiation. He ion implantation formed He nano-bubbles on a Nb plate and led to formation of protrusions while migrating in Nb matrix; fiberform nanostructures (FN) were grown when the fluence became high (> 10 26 m À2 ). The necessary conditions for the formation of Nb FN were revealed to be the surface temperature range of 900-1100 K and the incident ion energy higher than 70 eV. The sample was oxidized at 573-773 K in an air atmosphere, and Pt nanoparticles were photo-deposited on the Nb 2 O 5 samples. The surface was analyzed by scanning electron microscope, transmission electron microscope, x-ray photoelectron spectroscopy, and ultraviolet-visible spectrophotometry. Photocatalytic activity of the fabricated materials was studied using methylene blue (MB) decolorization process. An enhanced photocatalytic performance was identified on FN Nb 2 O 5 substrate with Pt deposition.[a] Dr.

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Surface modification of titanium using He plasma

Cited by 42 publications

References 29 publications

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

One‐Step Plasma Synthesis of Nb₂O₅ Nanofibers and their Enhanced Photocatalytic activity

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Surface modification of titanium using He plasma

Cited by 42 publications

References 29 publications

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Morphology Changes of Platinum and Tungsten Carbide by He Plasma Irradiation

Nitrogen Nanobubbles in a-SiOxNy Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

One‐Step Plasma Synthesis of Nb2O5 Nanofibers and their Enhanced Photocatalytic activity

Contact Info

Product

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About

Nitrogen Nanobubbles in a-SiO_xN_y Coatings: Evaluation of Its Physical Properties and Chemical Bonding State by Spatially Resolved Electron Energy-Loss Spectroscopy

One‐Step Plasma Synthesis of Nb₂O₅ Nanofibers and their Enhanced Photocatalytic activity