Mo-containing tetrahedral amorphous carbon deposited by dual filtered cathodic vacuum arc with selective pulsed bias voltage

a Iron-doped tetrahedral amorphous carbon thin films (Fe/ta-C) were deposited with varying iron content using a pulsed filtered cathodic vacuum arc system (p-FCVA). The aim of this study was to understand effects of iron on both the physical and electrochemical properties of the otherwise inert sp 3 -rich ta-C matrix. As indicated by X-ray photoelectron spectroscopy (XPS), even $0.4 at% surface iron had a profound electrochemical impact on both the potential window of ta-C in H 2 SO 4 and KOH, as well as pseudocapacitance. It also substantially enhanced the electron transport and re-enabled facile outer sphere redox reaction kinetics in comparison to un-doped ta-C, as measured with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) using outer-sphere probes Ru(NH 3 ) 6 , IrCl 6 , and FcMeOH. These increases in surface iron loading were linked to increased surface oxygen content and iron oxides. Unlike few other metals, an iron content even up to 10 at% was not found to result in the formation of sp 2 -rich amorphous carbon films as investigated by Raman spectroscopy. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) investigations found all films to be amorphous and ultrasmooth with R q values always in the range of 0.1-0.2 nm. As even very small amounts of Fe were shown to dominate the electrochemistry of ta-C, implications of this study are very useful e.g. in carbon nanostructure synthesis, where irregular traces of iron can be readily incorporated into the final structures.

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“…for Zn, Mo and W/ DLC composite lms. 34,35,45 XPS. As indicated by the high-resolution Fe 2p and O 1s spectra in Fig.…”

Section: Resultsmentioning

confidence: 99%

Characterization and electrochemical properties of iron-doped tetrahedral amorphous carbon (ta-C) thin films

2018

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“…By comparison silver doping slightly decreased the sp 3 content in hydrogen-free DLC, while for hydrogenated DLC the sp 2 /sp 3 ratio was relatively constant. An explanation for the slight drop in sp 3 content in hydrogen-free DLC is due to its cathodic arc deposition process that the subplantation mechanism [20,21] was suppressed by the presence of silver [13,22]. Also, the silver species may have formed nano-particles that absorbed compressive stress from the DLC matrix to reduce the carbon densification [6]; this effect is more pronounced in hydrogen-free DLC films than hydrogenated DLC films because in hydrogenated DLC films hydrogen fills up much of the empty space of the DLC network and therefore the magnitude of compressive stress was less during deposition.…”

Section: Resultsmentioning

confidence: 99%

Comparative surface and nano-tribological characteristics of nanocomposite diamond-like carbon thin films doped by silver

Zhang

Endrino

Anders

2008

Applied Surface Science

178

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In this study we have deposited silver-containing hydrogenated and hydrogen-free diamondlike carbon (DLC) nanocomposite thin films by plasma immersion ion implantation-deposition methods. The surface and nano-tribological characteristics were studied by x-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and nano-scratching experiments. The silver doping was found to have no measurable effect on sp 2 -sp 3 hybridization of the hydrogenated DLC matrix and only a slight effect on the hydrogen-free DLC matrix. The surface topography was analyzed by surface imaging. High-and low-order roughness determined by AFM characterization was correlated to the DLC growth mechanism and revealed the smoothing effect of silver. The nano-tribological characteristics were explained in terms of friction mechanisms and mechanical properties in correlation to the surface characteristics. It was discovered that the adhesion friction was the dominant friction mechanism; the adhesion force between the scratching tip and DLC surface was decreased by hydrogenation and increased by silver doping.

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“…Another way of producing metal-containing ta-C films is by using a pulsed filtered arc with two cathodes [100,101,102]. The amount of metal in the film can easily be adjusted by selection of the metal to carbon pulse ratio.…”

Section: Hydrogen Nitrogen and Metal-doped Tetrahedral Amorphous Camentioning

confidence: 99%

“…The amount of metal in the film can easily be adjusted by selection of the metal to carbon pulse ratio. An interesting twist in the work [101,102] was that the substrate was biased when carbon ions arrived at the substrate while no bias was applied at the time of metal ion arrival. In this way, the ratio of sp 3 and sp 2 bonds could be affected independently of the concentration of metal.…”

Section: Hydrogen Nitrogen and Metal-doped Tetrahedral Amorphous Camentioning

confidence: 99%

Some Applications of Cathodic Arc Coatings

Anders

2008

Cathodic Arcs

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Mo-containing tetrahedral amorphous carbon deposited by dual filtered cathodic vacuum arc with selective pulsed bias voltage

Cited by 29 publications

References 13 publications

Characterization and electrochemical properties of iron-doped tetrahedral amorphous carbon (ta-C) thin films

Characterization and electrochemical properties of iron-doped tetrahedral amorphous carbon (ta-C) thin films

Comparative surface and nano-tribological characteristics of nanocomposite diamond-like carbon thin films doped by silver

Some Applications of Cathodic Arc Coatings

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