Effect of the Analytic Regions on the Quality Trend of Diamond-like/Graphitic Carbon Ratios in Raman Spectra

Shen, Ai-Lin; Weng, Yu–Ching; Chou, Tse‐Chuan

doi:10.1515/znb-2010-0111

Cited by 11 publications

(7 citation statements)

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“…However, based on the present data, the uncertainty of the equation using the area ratio is greater than that using the height ratio (Table S1). As a possible reason, it is conceivable that it is difficult to determine the integrated boundary condition because the distance between the Fermi diad split and hot band is too close . In order to verify the significance of the height ratio, multiple regression analysis was performed using the area ratio in the same way as the calculation method shown below.…”

Section: Resultsmentioning

confidence: 99%

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Hagiwara

Takahata

Torimoto

et al. 2018

J Raman Spectroscopy

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CO2 fluid inclusions are popular in the mantle‐derived rock. CO2 Raman densimeter is widely used for estimating depth provenance and magma plumbing system. However, in order to obtain precise CO2 density, we should also measure CO2 temperature simultaneously because the densimeter has temperature dependency. In this study, we measured CO2 Raman spectra with densities of 0.8–1.0 g/cm3 at temperatures of 15, 25, 35, 45, and 55°C using a high‐pressure optical cell. We propose a new equation relating hot bands to the Fermi diad intensity ratio, temperature, and distance between the Fermi diad (delta, cm−1), which has higher accuracy than those of previous studies (±3.9–4.7°C) across all measurement conditions. The change in temperature engenders thermal expansion or shrinkage of mineral, resulting in change in CO2 density of fluid inclusion. Simultaneous measurement of both density and temperature of CO2 will be a probe for elastic property of minerals.

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Section: Resultsmentioning

confidence: 99%

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Hagiwara

Takahata

Torimoto

et al. 2018

J Raman Spectroscopy

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“…The main peak heights were used to determine the D-to-G band intensity ratios ( I D / I G ). This methodology was selected, as opposed to using the area ratios, to avoid arbitrary assignment of the limits for the integral function and the associated statistically larger standard deviations, as found and reported previously . A localized Gaussian peak-fitting methodology using Origin software was utilized to find both the absolute heights and wavenumber positions of D and G bands.…”

Section: Experimental Methodsmentioning

confidence: 99%

Generalized Mechanistic Framework for Ethane Dehydrogenation and Oxidative Dehydrogenation on Molybdenum Oxide Catalysts

et al. 2020

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Ethane turnovers to ethylene in either oxidehydrogenation with diverse oxidants (O 2 , CO 2 , H 2 O) or dehydrogenation (without an oxidant) over two-dimensional MoO x dispersed on Al 2 O 3 catalyst occur via a generalized mechanistic framework encompassing ternary catalytic cycles of C 2 H 6 activation, oxidant activation, and carbon removal. This is confirmed from rate assessments, detailed kinetic analysis accounting for active site loss, isotopic tracer studies, and detailed spectroscopic characterization. Irrespective of the oxidant's chemical identity, the C 2 H 6 activation cycle occurs via the kinetically relevant C−H bond activation of C 2 H 6 on lattice oxygen of MoO x , forming C 2 H 4 . The concomitant oxidant activation cycle either replenishes the oxygen vacancies or generates reactive oxygen species, which scavenge unwanted carbonaceous debris deposited on catalyst surfaces at contents dictated by the chemical identity of the oxidant and oxygen chemical potential that it exerts. Among the oxidants, O 2 is the most effective, as it removes coke effectively, leading to essentially no rate decay. CO 2 and H 2 O are alternate soft oxidants, and their use prevents the overoxidation of ethylene, thus resulting in higher ethylene selectivity (80−85%) than using O 2 . CO 2 activation is, however, severely restricted kinetically, as evidenced from the reverse water−gas shift reaction that is far away from chemical equilibrium; thus, the generation of reactive oxygen species and their ability to concomitantly oxidize coke are much less effective than those with O 2 oxidant. H 2 O dissociation is rapid and quasi-equilibrated, but its activation converts a portion of the active lattice oxygen to hydroxy species, reducing the active oxygen centers and lowering C 2 H 6 turnovers. The rates of the C 2 H 6 activation cycle dictate the intrinsic rates, whereas those of the concomitant oxidant activation and carbon removal cycles dictate the surface lattice oxygen density available for catalysis and in turn the extent of rate decay. Consolidating these findings within a generalized mechanistic framework leads to a universal rate expression containing two terms, one accounting for an intrinsic C 2 H 6 activation rate and a second one for the time-dependent rate decay. This universal rate expression captures the kinetic properties of early transition-metal oxides in C 2 H 6 catalysis, irrespective of the chemical identity of the oxidant.

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“…Thus, all three spectra confirmed the presence of DLC structure on the silicon substrate. The intensity ratio of the two peaks ( I D / I G ) was directly related to the sp 2 /sp 3 ratio and has been widely used for the qualitative estimation of the changes in the sp 2 /sp 3 ratio 32–34 . With the incorporation of the oxygen and fluorine atoms on the surface of the Si‐DLC coatings, the G peak position shifted to higher wavenumber values, from 1482 cm −1 of untreated Si‐DLC to 1498 and 1493 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The intensity ratio of the two peaks (I D /I G ) was directly related to the sp 2 /sp 3 ratio and has been widely used for the qualitative estimation of the changes in the sp 2 /sp 3 ratio. [32][33][34] With the incorporation of the oxygen and fluorine atoms on the surface of the Si-DLC coatings, the G peak position shifted to higher wavenumber values, from 1482 cm −1 of untreated Si-DLC to 1498 and 1493 cm −1 , respectively. At the same time, the I D /I G ratio increased from .27 to .71 and .72 for O-Si-DLC and F-Si-DLC.…”

Section: F I G U R E 2 Afm Images Of (A) Si-dlc (B) O-si-dlc and (C)mentioning

confidence: 99%

Antifungal behavior of silicon‐incorporated diamond‐like carbon by tuning surface hydrophobicity with plasma treatment

Yang

Riley

Rodenhausen

et al. 2022

Int J Applied Ceramic Tech

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Silicon-incorporated diamond-like carbon (Si-DLC), an amorphous material containing Si atoms with sp 3 -and sp 2 -hybridized carbon, is a promising biomaterial for versatile biomedical applications due to its excellent mechanical properties, chemical inertness, biocompatibility, and antimicrobial capability. However, the antifungal properties of plasma-treated Si-DLC have not been systematically evaluated. In this study, Si-DLC coatings were deposited by chemical vapor deposition and further treated with either oxygen or fluorine plasma to render the surface anchored with different functional groups and hydrophobicity. Surface roughness was probed with atomic force microscopy, whereas bonding character and surface composition were assessed using Raman and X-ray photoelectron spectroscopy. Wettability and surface charge were investigated via water contact angle and zeta potential measurements. Antifungal assessment was performed using a Candida albicans multi-well plate screening technique and crystal violet biomass quantification. The results demonstrate that oxygen plasma-treated Si-DLC exhibited hydrophilic properties, lower negative zeta potential, and significant antifungal behavior. This material can potentially be applied on surfaces for the prevention of reduced nosocomial infections.

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Effect of the Analytic Regions on the Quality Trend of Diamond-like/Graphitic Carbon Ratios in Raman Spectra

Cited by 11 publications

References 0 publications

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Generalized Mechanistic Framework for Ethane Dehydrogenation and Oxidative Dehydrogenation on Molybdenum Oxide Catalysts

Antifungal behavior of silicon‐incorporated diamond‐like carbon by tuning surface hydrophobicity with plasma treatment

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Effect of the Analytic Regions on the Quality Trend of Diamond-like/Graphitic Carbon Ratios in Raman Spectra

Cited by 11 publications

References 0 publications

CO2 Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO2 Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

Generalized Mechanistic Framework for Ethane Dehydrogenation and Oxidative Dehydrogenation on Molybdenum Oxide Catalysts

Antifungal behavior of silicon‐incorporated diamond‐like carbon by tuning surface hydrophobicity with plasma treatment

Contact Info

Product

Resources

About

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers

CO₂ Raman thermometer improvement: Comparing hot band and Stokes and anti‐Stokes Raman scattering thermometers