Alloyed and hydrogenated diamond-like carbon thin films deposited by a new high performance microwave low pressure plasma source

Niederberger, L.; Holleck, H.; Leiste, H.; Stüber, M.; Ulrich, S.; Baumann, H.

doi:10.1016/s0257-8972(03)00612-1

Cited by 11 publications

(3 citation statements)

References 17 publications

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“…Various concepts for the design and deposition of multifunctional amorphous carbon coatings and their properties have been reported in detail in previous publications. [63][64][65][66][67][68] All experiments were realised with as-deposited carbon coatings which naturally is terminated by various functional groups building a thin C-O-H layer.…”

Section: Methodsmentioning

confidence: 99%

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Stüber¹,

Niederberger²,

Danneil³

et al. 2007

Adv Eng Mater

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Diamond-like carbon (DLC) and amorphous carbon (a-C, a-C:H) coatings, respectively, have been proposed since many years as potential materials for biomedical applications due to their chemical inertness, low friction coefficient, high wear resistance, bio-and haemocompatibility. [1][2][3][4][5][6] The feasibility of amorphous carbon coatings was investigated for a variety of applications like surgical needles, [2] orthopaedic implants and prostheses, [7][8][9][10][11] medical guidewires, [12][13][14][15] coronary artery stents [16,17] and also for mechanical heart valve replacement and other solid implants. [18][19][20][21][22][23] The functionality, performance and durability of artificial surfaces in vivo are determined and often limited by their interaction with blood or tissue. However, the coagulation mechanism of blood on amorphous carbon (DLC) films in such a biomedical environment is not understood in detail even if the biocompatibility of DLC coatings was described early by many reports. [1,3,[24][25][26] Extensive information on individual aspects, like protein adsorption, platelet adhesion and activation on carbonaceous surfaces has been accumulated in the literature. [27][28][29] Since a few years more sophisticated approaches to the scientific understanding of the complex interaction of blood and inorganic surfaces are emerging by addressing this field through fundamental and interdisciplinary research efforts offering synoptical views based on materials science, chemistry, biology, physics, physical chemistry and medicine. [30][31][32] Main factors have been recognised to influence significantly the cell adhesion and interaction on amorphous carbon: these include the constitution of the carbon films and the fraction of the sp 3 bonds, [12,30] the surface energy and hydrophobicity, [27] and the surface roughness and topography. [26,31] The properties of a-C and DLC coatings, especially the biofunctional ones, can further be modified by incorporating other elements in the coatings, such as H, N, F, P, Si and metals. [4,5,[33][34][35][36][37][38][39] It is well known that the incorporation of additional elements into an amorphous carbon matrix has a very strong impact on the surface energy and wettability of such coatings. [40][41][42] Combining various surface modification methods should thus offer new tools for a future engineering design of biofunctional thin film materials, covering a wide range of properties, for example from strongly hydrophilic to extremely hydrophobic. Recently, it was shown that the modification of the inherent surface topography of carbon films on the nano-scale by proper adjusting of the deposition process and kinetics can strongly impact the wetting behaviour. [43] Similar or complementary effects were achieved through creating an artificial micro-or nano-scale surface topography by laser-patterning or plasma-etching or by subsequent thermal processing of carbon coatings. [44][45][46] From the biological perspective, the competitive adsorption of several plasma proteins (al...

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Section: Methodsmentioning

confidence: 99%

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Stüber¹,

Niederberger²,

Danneil³

et al. 2007

Adv Eng Mater

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“…3. Here, 'smart' combinations of coating composition (achievable 28 Unified and specific tribological challenges for carbon coated components and devices [76][77][78] or possibly B) and optimised internal bonding (control of sp 2 /sp 3 ratios), coupled with appropriate deposition and etching parameters in combination with vacuum annealing, should enable the mitigation of detrimental internal stresses and greatly improved interfacial fracture toughness. It should also become possible to create specific designs of surface dangling bonds to enable efficient chemical bonding with base oil and tribolayers yielded from tribochemical reaction with low environmental impact oil additives designed for the man made lubricated contact operating environment of automotive engines.…”

Section: Potential Of Surface Engineered Low Friction Autoengine Compmentioning

confidence: 99%

Coatings tribology drivers for high density plasma technologies

Dearnley

Neville

Turner³

et al. 2010

Surface Engineering

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The tribological operating environment for cutting tools, automotive components and biomedical implant bearing surfaces is highly challenging. An assessment of the limitations of state of the art of coated materials for use in these applications has been made. Special consideration is given to the prospects for diamond-like carbon coating materials and the requirements for future high density plasma based surface engineering technologies

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“…3) These films have been expected to possess excellent properties, such as high-mechanical hardness, low friction, and biocompatibility. [4][5][6] A number of decomposition methods for C 2 H 2 have so far been reported: examples of such methods are those involving the use of radio-frequency, 7,8) MW, [9][10][11] and electron-cyclotron resonance (ECR) 12,13) plasmas. The discussions on the mechanism of the decomposition of C 2 H 2 have been based on mass spectrometry, 14,15) OES, 14,16) and laser spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Production of CH(A²Δ) radicals from the dissociative excitation reaction of C₂H₂with microwave discharge flow of Ar

Ito¹,

Tsudome²

2015

Jpn. J. Appl. Phys.

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Optical emission spectra of the CH(A2Δ–X2Π) transition were observed using the dissociative excitation reaction of C2H2 with the microwave discharge flow of Ar at the pressure of Ar, PAr, in the range of 0.20–0.40 Torr. The mechanism of the production of the CH(A2Δ) state was investigated by the following two methods. The first is the comparison of the PAr dependences of the emission intensity, of the intensity of the laser-induced fluorescence spectra of the 3P1–3P0 transition of Ar, and of the density and temperature of free electrons. The second is the steady-state chemical kinetic analysis with several assumptions of the relevant reaction rate constants. It was concluded that CH(A2Δ) radicals were formed by charge transfer from Ar+ followed by ion–electron recombination with the significant contribution of the impact of free electrons. Energetic considerations revealed that the ions participating in the recombination reaction are excited vibrational levels of C2H2+.

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Alloyed and hydrogenated diamond-like carbon thin films deposited by a new high performance microwave low pressure plasma source

Cited by 11 publications

References 17 publications

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Coatings tribology drivers for high density plasma technologies

Production of CH(A²Δ) radicals from the dissociative excitation reaction of C₂H₂with microwave discharge flow of Ar

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Alloyed and hydrogenated diamond-like carbon thin films deposited by a new high performance microwave low pressure plasma source

Cited by 11 publications

References 17 publications

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Surface Topography, Surface Energy and Wettability of Magnetron‐Sputtered Amorphous Carbon (a‐C) Films and Their Relevance for Platelet Adhesion

Coatings tribology drivers for high density plasma technologies

Production of CH(A2Δ) radicals from the dissociative excitation reaction of C2H2with microwave discharge flow of Ar

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Production of CH(A²Δ) radicals from the dissociative excitation reaction of C₂H₂with microwave discharge flow of Ar