Structural and optical properties of doped amorphous carbon films deposited by magnetron sputtering

Marcinauskas, Liutauras; Dovydaitis, Vilius; Iljinas, Aleksandras; Andrulevičius, Mindaugas

doi:10.1016/j.tsf.2019.04.055

Cited by 12 publications

(7 citation statements)

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“…25 The ratios of integral area values of D and G peaks (I D /I G ) are summarized in Table S1. 26,27 Compared with the I D /I G value of CN (Co-0) (2.56), the I D /I G values of CN (Co-50) (2.47) and CN (Co-100) (2.29) decrease with the increasing Co content, suggesting an improved graphitization. 26 A more detailed structure of CN was observed via SEM images, as shown in Figure 3.…”

Section: Resultsmentioning

confidence: 98%

“…All Raman spectra show two prominent peaks, which correspond to the D-band (∼1325 cm –1 ) and G-band (∼1590 cm –1 ) for carbon materials, respectively . The ratios of integral area values of D and G peaks ( I D / I G ) are summarized in Table S1. , Compared with the I D / I G value of CN (Co‑0) (2.56), the I D / I G values of CN (Co‑50) (2.47) and CN (Co‑100) (2.29) decrease with the increasing Co content, suggesting an improved graphitization …”

Section: Resultsmentioning

confidence: 99%

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Controllable Structure and Basic Sites of Pd@N-Doped Carbon Derived from Co/Zn-ZIFs: Role of Co

Shao

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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Zeolite imidazolate frameworks (ZIFs) derivatives, porous N-doped carbon (CN) materials, show outstanding performance when used as catalyst supports. The characteristics of ZIFs affect significantly the microstructure of CN. In this work, a series of CN materials were fabricated through direct pyrolysis of Zn/Co-ZIFs and Pd@ CN catalysts were achieved by loading Pd nanoparticles. The results underline that the Co content in Zn/Co-ZIFs influences considerably the properties of CN and the catalytic activity of Pd@CN for the phenol hydrogenation to cyclohexanone. N 2 adsorption−desorption, CO 2 -TPD, and ICP analyses confirm that the increase of Co in ZIFs can enhance significantly the mesoporous ratio of CN for improving the loading and dispersion of Pd and increase the basic sites of CN materials for improving the phenol adsorption. As a result, significantly enhanced phenol conversion with similar cyclohexanone selectivity is achieved. These findings provide deep insights for the fabrication of ZIF-derived CN materials and their applications in catalysis.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Controllable Structure and Basic Sites of Pd@N-Doped Carbon Derived from Co/Zn-ZIFs: Role of Co

Shao

Zhang

et al. 2019

Ind. Eng. Chem. Res.

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“…Two peaks were observed in all Raman spectra of the samples (Figure B), associated with the D-band (≈1350 cm –1 ) and G-band (≈1590 cm –1 ) for carbons, respectively . The degree of graphitization can be assessed using the ratio of the areas of the D and G peaks ( I D / I G ) . In this study, these values were obtained using the “Peak Analysis” function in Origin 2018.…”

Section: Resultsmentioning

confidence: 99%

“…28 The degree of graphitization can be assessed using the ratio of the areas of the D and G peaks (I D /I G ). 29 In this study, these values were obtained using the "Peak Analysis" function in Origin 2018. As shown in Figure 1B, the I D /I G value of Co@CN-A is higher than that of Co@CN-H because of the presence of a large number of CNTs in Co@ CN-H (see also the discussion of the FESEM and HRTEM results), which indicates a higher graphitization degree.…”

Section: Methodsmentioning

confidence: 99%

Well-Defined MOF-Derived Hierarchically Porous N-Doped Carbon Materials for the Selective Hydrogenation of Phenol to Cyclohexanone

Shao

Zhang

Jiang

et al. 2021

Ind. Eng. Chem. Res.

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Metal organic framework (MOF) derivatives, porous N-doped carbons (CN), can be used as catalyst carriers owing to their excellent structural properties. The microstructures of MOF-derived carbon materials are affected considerably by the atmosphere in which the parent MOFs are pyrolyzed. In this study, a hierarchically porous N-doped carbon hybrid of carbon nanotubes and a porous carbon framework (denoted CN-H) was fabricated by pyrolysis in a H2/Ar atmosphere followed by acid etching, and subsequently, a Pd@CN-H catalyst was synthesized by the addition of Pd nanoparticles on the porous N-doped carbon support. The pyrolysis atmosphere and etching treatment significantly affected the morphology, specific surface area, meso/macropore ratio, and composition of the porous N-doped carbon materials, as well as the catalytic properties of the Pd@CN catalysts for the selective hydrogenation of phenol to produce cyclohexanone. Nitrogen adsorption–desorption measurements and inductively coupled plasma atomic absorption spectroscopy analyses confirmed that pyrolysis in a H2/Ar atmosphere and acid etching significantly increased the number of meso/macropores in Pd@CN-H, thus enhancing the Pd loading and phenol adsorption. As a result of the increased porosity, Pd loading, and phenol adsorption, the cyclohexanone selectivity and phenol conversion were improved. Furthermore, the as-fabricated Pd@CN-H catalyst displayed good reusability in recycling tests. These results provide insights into the synthesis of MOF-derived hybrid carbon materials and their possible utilization in catalysis.

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“…25 Furthermore, for the theoretical calculations, the pure amorphous carbon complex refractive index does not adjust the experimental data, corroborating a dual effect. 36,44 The amorphous material presents localized atomic ordered arrangement dominated by sp 2 clusters. The local clusters might be similar to graphite, corresponding to the NC phase.…”

Section: ■ Discussionmentioning

confidence: 99%

The Role of Amorphous Nanocrystalline Carbon Films in Interference on Flexible Copper Foils

Crespi

Ballage

Hugon

et al. 2022

ACS Appl. Electron. Mater.

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The ultrathin amorphous nanocrystalline carbon (a-C) layers deposited onto flexible copper foils are an alternative to reduce reflectance. Several problems like high melting energy and the enhanced reflection of pure Cu can be solved when using a-C films. Reflectance measurements were performed at normal incidence from near-ultraviolet to near-infrared. The experimental results are compared to a model based on multilayer propagation. It is found that a-C coating with suitable nanoscale thickness critically reduces Cu reflectance due to destructive interference and losses. Results can reach up to 80% reduction for specific a-C ultrathin films. This represents the minimum reflectance points (MR) varying as a function of wavelength. The thickness of MR varied from 25 to 65 nm in the range of this work. Sources of divergences between the model and the measurements include the substrate roughness and the unusual reflectance growth of Cu for shorter wavelengths. Raman spectroscopy confirmed the presence of nanocrystalline graphite in the a-C films potentialy improving absorption. a-C films are eco-friendly and lightweight, suitable for scalable process deposition. It is applicable for absorbing energy purposes such as laser.

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Structural and optical properties of doped amorphous carbon films deposited by magnetron sputtering

Cited by 12 publications

References 50 publications

Controllable Structure and Basic Sites of Pd@N-Doped Carbon Derived from Co/Zn-ZIFs: Role of Co

Controllable Structure and Basic Sites of Pd@N-Doped Carbon Derived from Co/Zn-ZIFs: Role of Co

Well-Defined MOF-Derived Hierarchically Porous N-Doped Carbon Materials for the Selective Hydrogenation of Phenol to Cyclohexanone

The Role of Amorphous Nanocrystalline Carbon Films in Interference on Flexible Copper Foils

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