Amorphous hydrogenated carbon (a-C:H) depositions on polyoxymethylene: Substrate influence on the characteristics of the developing coatings

Catena, Alberto; Kunze, M; Agnello, S.; Gelardi, F. M.; Wehner, Stefan; Fischer, Christian B.

doi:10.1016/j.surfcoat.2016.09.064

Cited by 20 publications

(30 citation statements)

References 37 publications

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“…Model ideas regarding the structure of a‐C:H layers suggest an alternating composition consisting of sections with a graphite and diamond‐like structure . For PECVD depositions of a‐C:H on several polymer materials, Catena et al observed a thickness‐dependent generation of specifically modified material properties on top, especially caused by the size of the carbon clusters and an increasing content of sp 2 ‐carbon centers . Similar observations were found by some of the authors for these a‐C:H depositions on silicon (100) wafers .…”

Section: Introductionsupporting

confidence: 62%

“…The coating of silicon wafers (100) with a‐C:H was arranged according to a well‐established procedure via RF‐PECVD . The Si samples with a 500 nm a‐C:H layer were irradiated with UV light without further workup in a 0.0011 mol L −1 solution of 4 or 5 , respectively, for 95 min using a procedure that is closely related to published results (see the Experimental Section) .…”

Section: Resultsmentioning

confidence: 99%

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Attaching Photochemically Active Ruthenium Polypyridyl Complex Units to Amorphous Hydrogenated Carbon (a‐C:H) Layers

Schink

Catena

Heintz

et al. 2018

Adv Materials Inter

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Amorphous hydrogenated carbon (a-C:H) films are applied 500 nm thick on Si(100) via plasma-enhanced chemical vapor deposition (PECVD) using ethyne. Present plasma conditions enrich the sp 2 -content especially toward the outermost a-C:H layers, which in turn are used to attach a photoactive Ru-polypyridyl complex to the surface. An azo-bridged dinuclear Ru-polypyridyl complex is optimized in synthesis and the final mononuclear fragment attached on a-C:H photochemically under UV-irradiation with concomitant N 2 release. The Ru-polypyridyl complex is characterized by MS, NMR, IR, UV/vis, fluorescence spectroscopy, and time-dependent density functional theory (DFT) calculations. Crystallographic data for the intermediate 4-nitro-2-(pyridin-2-yl)pyridine 1-oxide as essential precursor are established. Morphological characteristics of the a-C:H @ Si and final Ru(complex) @ a-C:H @ Si combinations are determined by atomic force microscopy (AFM) revealing individual grain-like structures. The presence of Ru on the a-C:H @ Si surface is initially verified qualitatively by laser-induced breakdown spectroscopy (LIBS) and by inductively coupled plasma-sector field mass spectrometry (ICP-SF-MS) after chemical digestion. With laser ablation-ICP-MS mapping, full Ru coverage is proven, also revealing inhomogeneities in terms of "Ru hot spots". The current investigation proves the successful attachment of a Ru-complex on a-C:H and indicates a starting point for the development of further material combinations for feasible sunlight to energy conversions. Surface FunctionalizationThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Section: Introductionsupporting

confidence: 62%

Section: Resultsmentioning

confidence: 99%

Attaching Photochemically Active Ruthenium Polypyridyl Complex Units to Amorphous Hydrogenated Carbon (a‐C:H) Layers

Schink

Catena

Heintz

et al. 2018

Adv Materials Inter

Self Cite

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“…So-called subplantation processes are a reasonable explanation for this behavior, which consists of three main reactions: (i) Surface etching with plasma species, (ii) insertion of C and H+ ions into the (sub)surface and (iii) surface absorption of plasma radicals to form new bonds. The interlayer formation stops at a layer thickness of around 50 nm and is considered complete as soon as the formation of =CH2 bonds takes place [23,41]. Therefore, a possible interlayer phase for the present PHB is less than 50 nm.…”

Section: Drift Spectroscopymentioning

confidence: 93%

“…The coating process is described in detail elsewhere [5,20,21], but here only briefly: Sample holders were placed 275 mm in front of the plasma source. This direct alignment results in so-called r-type diamond-like carbon (DLC) coatings [20][21][22][23]. An initial oxygen plasma (10 min, 200 W, 1 Pa, 65 sccm/min) cleaned and activated the PHB surface for further coating.…”

Section: Sample Preparation and Film Depositionmentioning

confidence: 99%

“…Figure 3 presents the corresponding spectra in ascending order plotted to arbitrary units (a.u.). The analysis of the DRIFT spectra was carried out on the basis of our own previous results, the work of other groups and known fundamental data [15,23,25,[41][42][43]. In the range of 450 to 4100 cm −1 all samples were checked for chemical differences in the carbon coating first, before detailed analysis in the C-H stretching area between 2750-3150 cm −1 for the CH 2 and CH 3 groups followed [15,25,42,43].…”

Section: Drift Spectroscopymentioning

confidence: 99%

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Changing Contents of Carbon Hybridizations in Amorphous Hydrogenated Carbon Layers (a-C:H) on Sustainable Polyhydroxybutyrate (PHB) Exhibit a Significant Deterioration in Stability, Depending on Thickness

Schlebrowski

Beucher

Bazzi

et al. 2019

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PHB is a biodegradable polymer based on renewable raw materials that could replace synthetic polymers in many applications. A big advantage is the resulting reduction of the waste problem, as well as the conservation of fossil resources. To arrange it for various applications, the surface is arranged by plasma-enhanced chemical vapor deposition (PECVD) with amorphous hydrogenated carbon layers (a-C:H). Here, on a 50 µm thick PHB-foil, a-C:H layers of different thicknesses (0-500 nm) were deposited in 50 nm steps. Surface topography was investigated by scanning electron microscopy (SEM), chemical composition by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and wettability checked by contact angle. In addition, layers were examined by synchrotron supported X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS), which revealed thickness dependent changes of the sp 2 /sp 3 ratio. With increasing thickness, even the topography changes show internal, stress-induced phenomena. The results obtained provide a more detailed understanding of the predominantly inorganic a-C:H coatings on (bio)polymers via in situ growth.

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Achievement of Green and Sustainable CVD Through Process, Equipment and Systematic Optimization in Semiconductor Fabrication

Baek,

Park,

Koh

et al. 2024

Int. J. of Precis. Eng. and Manuf.-Green Tech.

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Amorphous hydrogenated carbon (a-C:H) depositions on polyoxymethylene: Substrate influence on the characteristics of the developing coatings

Cited by 20 publications

References 37 publications

Attaching Photochemically Active Ruthenium Polypyridyl Complex Units to Amorphous Hydrogenated Carbon (a‐C:H) Layers

Attaching Photochemically Active Ruthenium Polypyridyl Complex Units to Amorphous Hydrogenated Carbon (a‐C:H) Layers

Changing Contents of Carbon Hybridizations in Amorphous Hydrogenated Carbon Layers (a-C:H) on Sustainable Polyhydroxybutyrate (PHB) Exhibit a Significant Deterioration in Stability, Depending on Thickness

Achievement of Green and Sustainable CVD Through Process, Equipment and Systematic Optimization in Semiconductor Fabrication

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