Changes in chemical bonding of diamond-like carbon films by atomic-hydrogen exposure

Nakazawa, Hiroyuki; Osozawa, R.; Enta, Yoshiharu; Suemitsu, Maki

doi:10.1016/j.diamond.2010.08.001

Cited by 6 publications

(14 citation statements)

References 29 publications

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“…Low‐energy ion implants can break down the sp 3 structure, producing more sp 2 bonding especially in proximity to the surface (e.g., Nakazawa et al. ); however, others have observed that ion implants destabilize (stress‐relieve) the DLC matrix to produce nanodiamonds (Logothetidis et al. ).…”

Section: Experimental: Materials and Techniquesmentioning

confidence: 99%

“…Low-energy H implants (and other shallow ion implants) have been shown to physically change the structure of DLC. Low-energy ion implants can break down the sp 3 structure, producing more sp 2 bonding especially in proximity to the surface (e.g., Nakazawa et al 2010); however, others have observed that ion implants destabilize (stress-relieve) the DLC matrix to produce nanodiamonds (Logothetidis et al 1998). Implanted SW H may increase conductivity through graphitization or make the sample more insulating by creating nanodiamonds, depending both on the energy of the H ion and the local structure of the DLC.…”

Section: Matrix Effects and Their Causes In Dlcmentioning

confidence: 99%

See 1 more Smart Citation

Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Jurewicz

Rieck

Hervig

et al. 2020

Meteorit & Planetary Scien

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NASA's Genesis Mission returned solar wind (SW) to the Earth for analysis to derive the composition of the solar photosphere from solar material. SW analyses control the precision of the derived solar compositions, but their ultimate accuracy is limited by the theoretical or empirical models of fractionation due to SW formation. Mg isotopes are “ground truth” for these models since, except for CAIs, planetary materials have a uniform Mg isotopic composition (within ≤1‰) so any significant isotopic fractionation of SW Mg is primarily that of SW formation and subsequent acceleration through the corona. This study analyzed Mg isotopes in a bulk SW diamond‐like carbon (DLC) film on silicon collector returned by the Genesis Mission. A novel data reduction technique was required to account for variable ion yield and instrumental mass fractionation (IMF) in the DLC. The resulting SW Mg fractionation relative to the DSM‐3 laboratory standard was (−14.4‰, −30.2‰) ± (4.1‰, 5.5‰), where the uncertainty is 2ơ SE of the data combined with a 2.5‰ (total) error in the IMF determination. Two of the SW fractionation models considered generally agreed with our data. Their possible ramifications are discussed for O isotopes based on the CAI nebular composition of McKeegan et al. (2011).

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Section: Experimental: Materials and Techniquesmentioning

confidence: 99%

Section: Matrix Effects and Their Causes In Dlcmentioning

confidence: 99%

Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Jurewicz

Rieck

Hervig

et al. 2020

Meteorit & Planetary Scien

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“…As a general rule, sp 3 (fourfold, ''diamond like'') bonding adds strength and wear resistance, increased thermal conductivity and lower electrical conductivity relative to sp 2 (threefold, ''graphitic'') bonding; incorporating H into the carbon structure during fabrication can allow increased diffusivity, elasticity, and polymerization. H exposure in the laboratory can, however, change the amount of sp 3 /sp 2 carbon bonds at the surface, with the direction of that change depending upon environmental conditions [6]. Damage to DLC under ion beams has been known to catalyze non-equilibrium changes in microstructure Figure 1 Relationship of Genesis material to other forms of amorphous carbon films as a function of bonding and H-content (after [4]).…”

Section: Amorphous Diamond-like Carbon Filmsmentioning

confidence: 99%

“…For the calculation of the conditions for this extreme scenario see [10] and the SOM. Another possibility at low impact energy is that the sp 2 -bonded carbon is more quickly eroded than the sp 3 -bonded carbon (e.g., [6]). Whichever model is used, Fig.…”

Section: Standard Profilementioning

confidence: 99%

Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants

et al. 2017

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An amorphous diamond-like carbon film deposited on silicon made at Sandia National Laboratory by pulsed laser deposition was one of several solar wind (SW) collectors used by the Genesis Mission (NASA Discovery Class Mission #5). The film was *1 lm thick, amorphous, anhydrous, and had a high ratio of sp 3 -sp 2 bonds ([50%). For 27 months of exposure to space at the first Lagrange point, the collectors were passively irradiated with SW (H fluence *2 9 10 16 ions cm -2 ; He fluence *8 9 10 14 ions cm -2 ). The radiation damage caused by the implanted H ions peaked at 12-14 nm below the surface of the film and that of He about 20-23 nm. To enable quantitative measurement of the SW fluences by secondary ion mass spectroscopy, minor isotopes of Mg ( 25 Mg and 26 Mg) were commercially implanted into flight-spare collectors at 75 keV and a fluence of 1 9 10 14 ions cm -2 . The shapes of analytical depth profiles, the rate at which the profiles were sputtered by a given beam current, and the intensity of ion yields are used to characterize the structure of the material in small areas (*200 9 200 ± 50 lm). Data were consistent with the hypothesis that minor structural changes in the film were induced by SW exposure.

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“…Our rst SIMS analyses of SW 24 Mg in DLC treated the collector as a homogeneous material and, in addition, used implants of minor ions ( 25 Mg, 26 Mg) for calibration. This method was exactly the same as that used for silicon.…”

Section: Issues Encountered Analysing Dlc By Simsmentioning

confidence: 99%

Quantifying low fluence ion implants in diamond-like carbon film by secondary ion mass spectrometry by understanding matrix effects

Jurewicz

Olinger

Burnett

et al. 2021

J. Anal. At. Spectrom.

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Changes in chemical bonding of diamond-like carbon films by atomic-hydrogen exposure

Cited by 6 publications

References 29 publications

Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Magnesium isotopes of the bulk solar wind from Genesis diamond‐like carbon films

Understanding heterogeneity in Genesis diamond-like carbon film using SIMS analysis of implants

Quantifying low fluence ion implants in diamond-like carbon film by secondary ion mass spectrometry by understanding matrix effects

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