Calibration of Binding Energy Positions with C1s for XPS Results

Fang, De; He, Feng; Xie, Jianliang; Li, Xue

doi:10.1007/s11595-020-2312-7

Cited by 202 publications

(87 citation statements)

References 36 publications

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“…The X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS) measurements were performed at the synchrotron BESSY, Helmholtz-Zentrum Berlin, during the low-alpha phase and used as supportive studies of the carbon bond state on the surface. The used HE-SGM beamline system is described elsewhere [ 33 ]. To prevent charge-induced effects on the sample surface it is additionally equipped with a flood gun.…”

Section: Methodsmentioning

confidence: 99%

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Plasma Supported Deposition of Amorphous Hydrogenated Carbon (a-C:H) on Polyamide 6: Determining Interlayer Completion and Dehydrogenation Effects during Layer Growth

et al. 2021

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Polyamide 6 (PA6) is a commonly used material in many different sectors of modern industry. Herein, PA6 samples were coated with amorphous carbon layers (a-C:H) with increasing thickness up to 2 µm using radio frequency plasma enhanced chemical vapor deposition for surface adjustment. The morphology of the carbon coatings was inspected by ex situ atomic force microscopy and scanning electron microscopy. Surface wettability was checked by contact angle measurements. The chemical composition was analyzed using the surface sensitive synchrotron X-ray-based techniques near-edge X-ray absorption fine structure and X-ray photoelectron spectroscopy, supported by diffuse reflectance infrared Fourier transform spectroscopy. Particular attention was paid to the coating interval from 0 to 100 nm, to specify the interlayer thickness between the PA6 polymer and a-C:H coating, and the region between 1000 and 2000 nm, where dehydrogenation of the a-C:H layer occurs. The interlayer is decisive for the linkage of the deposited carbon layer on the polymer: the more pronounced it is, the better the adhesion. The thickness of the interlayer could be narrowed down to 40 nm in all used methods, and the dehydrogenation process takes place at a layer thickness of 1500 nm.

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Section: Methodsmentioning

confidence: 99%

“…To compensate for static charges, the scale of the binding energy was corrected in the evaluations. The C1s peak was set to a value of 284.8 eV [ 33 ].…”

Section: Methodsmentioning

confidence: 99%

Plasma Supported Deposition of Amorphous Hydrogenated Carbon (a-C:H) on Polyamide 6: Determining Interlayer Completion and Dehydrogenation Effects during Layer Growth

et al. 2021

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“…Subsequently, the C1s peaks were analyzed in detail and evaluated with CasaXPS (software version 2.3.18, Casa Software Ltd., Teignmouth, UK). For the analysis, the C1s peaks were placed at 284.8 eV to compensate for any static charge present [31]. The fractions of sp 2 , sp 3 , C-O and C=O bonds in the total C1s peak were determined via peak deconvolution.…”

Section: Sample Surface Chemical Compositionmentioning

confidence: 99%

The Growth Behavior of Amorphous Hydrogenated Carbon a-C:H Layers on Industrial Polycarbonates—A Weak Interlayer and a Distinct Dehydrogenation Zone

Schlebrowski

Fritz

Beucher

et al. 2021

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Polycarbonate (PC) is a material that is used in many areas: automotive, aerospace engineering and data storage industries. Its hardness is of particular importance, but some applications are affected by its low wettability or scratch susceptibility. This can be changed either by blending with other polymers, or by surface modifications, such as the application of an amorphous hydrogenated carbon layer (a-C:H). In this study, individual a-C:H layers of different thicknesses (10–2000 nm) were deposited on PC by RF PECVD. Both the layer morphology with AFM and SEM and the bonding states of the carbon on the surface with synchrotron-assisted XPS and NEXAFS were studied. The aim was to investigate the coatability of PC and the stability of the a-C:H. Special attention was paid to the interlayer region from 0 to 100 nm, since this is responsible for the layer to base material bonding, and to the zone of dehydrogenation (from about 1000 nm), since this changes the surface composition considerably. For PC, the interlayer was relatively small with a thickness of only 20 nm. Additionally, a correlation was found between the evolving grain structure and the development of the C‒H peak according to NEXAFS C K-edge measurements.

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“…0.66 (Table S3), in line with the total C/N ratio. In XPS C 1s a peak at 284.0 eV (in literature mainly calibrated at 284.8 eV and defined as 'adventitious carbon') 42 we assign to electron rich, e.g. carbide-like, carbon (Ccarb).…”

Section: Resultsmentioning

confidence: 99%

Ligand-Metal Charge Transfer Induced via Adjustment of Textural Properties Controls the Performance of Single-Atom Catalysts During Photocatalytic Degradation

Liu¹,

Zou²,

Cruz³

et al. 2021

Preprint

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Because of their peculiar nitrogen-rich structure, carbon nitrides are convenient polydentate ligands for designing single-atom-dispersed photocatalysts. However, the relation of catalysts textural properties with their photophysical properties and as a result activity in photocatalytic applications is rarely elaborated. Herein we report the preparation and characterization of a series of single-atom heterogeneous catalysts featuring highly-dispersed Ag and Cu species on mesoporous graphitic C<sub>3</sub>N<sub>4</sub>. We show that adjustment of materials textural properties and thereby metal single atoms coordination mode enables ligand-to-metal (LMCT) or ligand-to-metal-to-ligand charge transfer (LMLCT), a property tha was long speculated in single-atom catalysis but never observed. We employ the developed materials in the degradation of organic pollutant under irradiation with visible light. Kinetic investigations under flow conditions show that single atoms of Ag and Cu decrease the amount of toxic organic fragmentation products, while leading to a higher selectivity towards full calcination. The results correlate with the selected mode of charge transfer in the designed photocatalysts and provide a new understanding of the surface state of single-atom catalysts. The concepts can be exploited further to rationally design and optimize other single-atom materials.

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Calibration of Binding Energy Positions with C1s for XPS Results

Cited by 202 publications

References 36 publications

Plasma Supported Deposition of Amorphous Hydrogenated Carbon (a-C:H) on Polyamide 6: Determining Interlayer Completion and Dehydrogenation Effects during Layer Growth

Plasma Supported Deposition of Amorphous Hydrogenated Carbon (a-C:H) on Polyamide 6: Determining Interlayer Completion and Dehydrogenation Effects during Layer Growth

The Growth Behavior of Amorphous Hydrogenated Carbon a-C:H Layers on Industrial Polycarbonates—A Weak Interlayer and a Distinct Dehydrogenation Zone

Ligand-Metal Charge Transfer Induced via Adjustment of Textural Properties Controls the Performance of Single-Atom Catalysts During Photocatalytic Degradation

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