Synchrotron-based spectroscopic analysis of diamond-like carbon films from different source gases

Rittihong, Ukit; Akasaka, Hiroki; Euaruksakul, Chanan; Tomidokoro, Masashi; Kamonsuttipaijit, Nuntaporn; Nakajima, Hideki; Supruangnet, Ratchadaporn; Rojviriya, Catleya; Chingsungnoen, Artit; Poolcharuansin, Phitsanu; Ohtake, Naoto; Tunmee, Sarayut

doi:10.1016/j.radphyschem.2020.108944

Cited by 9 publications

(10 citation statements)

References 35 publications

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“…The near-edge X-ray absorption fine structure spectroscopy (NEXAFS) was measured at BL3.2 of the Synchrotron Light Research Institute (SLRI), Thailand. The K-edge NEXAFS spectra of carbon, oxygen, and nitrogen were obtained using an energy resolution of 0.5 eV (fwhm) in the total electron yield (TEY) mode. , The C K edge spectra were normalized with standard gold and calibrated with highly ordered pyrolytic graphite (HOPG) at 291.65 eV.…”

Section: Methodsmentioning

confidence: 99%

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Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction

Chakthranont

Nitrathorn

Thongratkaew

et al. 2021

ACS Appl. Energy Mater.

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Electroreduction of O2 is a promising method for decentralized H2O2 production. Due to their high selectivity, low cost, and highly tunable properties, O- and N-doped carbon catalysts are appealing for this process. However, the relative effects of O and N dopants on the catalytic performances of carbon are not well understood. In this work, we present highly active and selective 2e– O2 reduction catalysts based on doped carbon nanohorns (CNH) synthesized by the gas-injected arc-in-water (GI-AIW) method. The effects of O and N dopants incorporated during the synthesis and the post-treatment are investigated. We discovered that the selectivity of CNH may be more sensitive to changes in N dopant than to changes in O dopant. Our doped CNH catalyst exhibits an early onset potential of 0.85 V vs RHE, >80% selectivity, and excellent stability even after 5,000 cycles and 12 h of flow electrolysis. Our gas diffusion device can generate H2O2 at a practical concentration of 56 mM per hour, corresponding to a production rate of 0.74 mol h–1 gcat –1. These results suggest that regulating both O and N dopants is an effective design strategy for an efficient carbon catalyst, which is essential in the electrosynthesis of H2O2 from O2.

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Section: Methodsmentioning

confidence: 99%

“…The K-edge NEXAFS spectra of carbon, oxygen, and nitrogen were obtained using an energy resolution of 0.5 eV (fwhm) in the total electron yield (TEY) mode. 37,38 The C K edge spectra were normalized with standard gold and calibrated with highly ordered pyrolytic graphite (HOPG) at 291.65 eV.…”

Section: ■ Introductionmentioning

confidence: 99%

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction

Chakthranont

Nitrathorn

Thongratkaew

et al. 2021

ACS Appl. Energy Mater.

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“…4), the continuous wave plasma polymer is shown as a reference for crosslinked polymers. Unsaturated carbon-carbon bond are identified through the intense π  π* resonance at 284.9 eV [42,52] leading to the conclusion that the XPS substructure at 285 eV is composed of sp2 and sp3 carbons (Fig. 2, Table 7) as shown with FTIR analysis.…”

Section: Chemical Characterization Of Plasma Polymers Prepared In the Optimal Operating Parametersmentioning

confidence: 92%

“…However, for pp-Ac prepared in continuous discharge, the shoulder peak assigned to the post-oxidation is more pronounced meaning higher precursor fragmentation, radical creation and ultimately the postoxidation occurred. The other peaks of C-C and C-H σ* resonances are impacted with a peak broadening and lower base-line (-0.5) [42,52]. NEXAFS C K-edge spectra of pp-AA (Fig.…”

Section: Chemical Characterization Of Plasma Polymers Prepared In the Optimal Operating Parametersmentioning

confidence: 99%

Characterization of functionalized coatings prepared from pulsed plasma polymerization

Jagodar²,

Kovačević³

et al. 2021

Materials Chemistry and Physics

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Material assembly based on elastomer part and metallic substrate has been widely used in many industrial sectors. However, the adhesion between the two materials requests specific processes and adhesives. Plasma technology is an interesting way to prepare the assembly since the plasma polymer layers used for the adhesive joint can bear different reactive chemical functions toward the elastomer. Three different plasma coatings are synthesized from acetylene, acrylic acid, and maleic anhydride plasma because of their respective chemical functions able to open the carbon-carbon double bond of the elastomer (rubber, fluoroelastomer). For such a purpose, finetuning of plasma parameters was essential to preserve the precursor chemistry and to avoid any degradation. Pulsed plasma discharge was selected, plasma parameters defined thanks to the design of experiment. The different plasma polymers were characterized by FTIR, XPS and NEXAFS spectroscopies and surface energy measurement.

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“…Surface and bulk characterization methods have previously been used to analyze the compositions and structures of DLC coatings. These include X-ray photoelectron spectroscopy (XPS) and near-edge extended X-ray absorption fine structure (NEXAFS) techniques to obtain information on near-surface compositions. − In addition, XPS depth-profile analyses provide information on the subsurface compositions of DLC layers. Electron microscopy has been used to understand the morphological changes and phase transitions in PET polymers .…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Surface Compositions and Structures of Plasma-Modified Poly(ethylene terephthalate) Thin Films

et al. 2021

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Nanoscale compositions and structures of the plasma-treated surfaces of polymers often impart significant consequences on the barrier properties of thin films. Despite their technological importance for packaging and coating applications, a molecular-level understanding of their surface properties has been exceedingly challenging to obtain. This has been due to several factors, including their low external surface areas, nanometer-thin regions of surface modification, subtle differences between their surface versus bulk compositions, and the absence of long-range structural order. Nevertheless, recent advancements in solid-state nuclear magnetic resonance (NMR) spectroscopy, in particular using dynamic nuclear polarization (DNP) enhancement, in combination with X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared (FT-IR) spectroscopy analyses provide detailed insights on the compositions of thin surface layers of plasma-modified poly(ethylene terephthalate) (PET) thin films. Analyses of 2D 13C{1H} DNP heteronuclear correlation (HETCOR) NMR spectra of plasma-modified PET films enabled signals from sp 3 carbon species associated with thin (30–80 nm) diamond-like carbon (DLC) surface layers to be detected and identified, along with their interactions at embedded DLC-PET interfaces. Complementary XPS spectra provide insights into different surface and subsurface elemental compositions of the plasma-modified PET films, which are corroborated by FT-IR analyses. Subsurface compositions and structures, in particular carbon:oxygen atomic ratios and intermixing of the DLC surface layers and PET regions, are shown to depend on plasma-enhanced chemical vapor deposition conditions, leading to different gas barrier properties of surface-modified PET films.

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Synchrotron-based spectroscopic analysis of diamond-like carbon films from different source gases

Cited by 9 publications

References 35 publications

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction

Characterization of functionalized coatings prepared from pulsed plasma polymerization

Nanoscale Surface Compositions and Structures of Plasma-Modified Poly(ethylene terephthalate) Thin Films

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Synchrotron-based spectroscopic analysis of diamond-like carbon films from different source gases

Cited by 9 publications

References 35 publications

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H2O2 from O2 Reduction

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H2O2 from O2 Reduction

Characterization of functionalized coatings prepared from pulsed plasma polymerization

Nanoscale Surface Compositions and Structures of Plasma-Modified Poly(ethylene terephthalate) Thin Films

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Product

Resources

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Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction

Rational Design of Metal-free Doped Carbon Nanohorn Catalysts for Efficient Electrosynthesis of H₂O₂ from O₂ Reduction