Evolution of the sp2 content and revealed multilayer growth of amorphous hydrogenated carbon (a-C:H) films on selected thermoplastic materials

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

doi:10.1016/j.carbon.2017.02.093

Cited by 24 publications

(15 citation statements)

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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%

“…Preparation of a‐C:H Coatings : The coating of silicon wafers (100, Silicon Materials, Kaufering, Germany), sized 10 × 10 × 0.3 mm, with a‐C:H was arranged with a well‐established RF‐PECVD procedure . Briefly, Si samples were evenly arranged on an aluminum plate and fixed with carbon pads (Plano G3347, Plano GmbH, Wetzlar, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…The whole process was conducted at ambient temperature in a high vacuum chamber with the sample holder located 275 mm in front of the plasma source. In this direct deposition process, more ion species penetrate the increasing carbon substrate surface changing the sp 2 and sp 3 carbon composition in the coating without any detectable temperature rise over 40 °C …”

Section: Methodsmentioning

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%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

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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“…As shown in Figure , the first treatment induced no relevant change to the G, 2D Raman bands apart from a small decrease of their intensity ratio from 2.8 down to 2.0. The successive vacuum treatment up to 18.5 h gives a blue shift of the two bands, some further reduction of their intensity ratio and the appearance of a large unresolved signal below the G band that can be associated to some amorphous carbon contribution arising from residual PMMA carbonization . The treatment of a sample in CO 2 atmosphere gives again minor changes to the positions of the Raman bands and a decrease of their intensity ratio down to 1.7.…”

Section: Resultsmentioning

confidence: 95%

Graphene‐SiO₂ Interaction from Composites to Doping

Armano

Buscarino

Cannas

et al. 2019

Physica Status Solidi (a)

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An overview of the interaction between monolayer graphene and SiO2 dielectric substrate is reported focusing on the effect this latter has on doping and strain induced by thermal treatments in controlled atmosphere. The disentanglement of strain and doping is highlighted and the comparison with another dielectric substrate of Al2O3 evidences the critical role that the substrate has in the electronic properties of graphene. The reported results pave the way for microelectronic devices based on graphene on dielectrics and for Fermi level tuning in composites of graphene and nanoparticles.

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DLC-Coated Thermoplastics: Tribological Analyses Under Dry and Lubricated Sliding Conditions

et al. 2022

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The purpose of this study was to increase the limited wear resistance of polymers in highly stressed tribological contacts. Therefore, diamond-like carbon (DLC) coatings were firstly developed and deposited on polymers. The development of the low temperature coating process was conducted on an industrial scale coating unit. Due to the use of polyether ether ether ketone (PEEK) and polyamide as substrate material, the coatings were tailored in accordance with different mechanical properties of the polymers. Furthermore, analyses regarding morphology, roughness as well as compound adhesion between coatings and polymers were conducted. The tribological analyses were accomplished for reciprocating sliding kinematics on pin-on-plate tribometer under dry conditions as well as boundary lubricated conditions. The results prove the ability of the coatings to undergo high plastic deformations without delamination. In addition, the possible formation of a composite layer of DLC and PEEK in the wear track due to high energy input under dry conditions was shown. Furthermore, the transformations of sp2 chain into ring bindings as well as a change of size and distribution of the sp2 clusters during dry contact conditions were observed.

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Evolution of the sp2 content and revealed multilayer growth of amorphous hydrogenated carbon (a-C:H) films on selected thermoplastic materials

Cited by 24 publications

References 31 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

Graphene‐SiO₂ Interaction from Composites to Doping

DLC-Coated Thermoplastics: Tribological Analyses Under Dry and Lubricated Sliding Conditions

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Evolution of the sp2 content and revealed multilayer growth of amorphous hydrogenated carbon (a-C:H) films on selected thermoplastic materials

Cited by 24 publications

References 31 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

Graphene‐SiO2 Interaction from Composites to Doping

DLC-Coated Thermoplastics: Tribological Analyses Under Dry and Lubricated Sliding Conditions

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Product

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Graphene‐SiO₂ Interaction from Composites to Doping