Tailored Hydrogen-Free Carbon Films by Tuning the sp<sup>2</sup>/sp<sup>3</sup> Configuration

Kang, Sojung; Park, Jin Woo; Park, Eul Doo; Jun, Youn Ki; Han, Jae Yeon; Jung, Jong Hoon; Kim, Namwon; Lee, Gwan Hyoung

doi:10.1021/acsaelm.1c00046

Cited by 22 publications

(11 citation statements)

References 62 publications

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“…In turn, the large transition region hindered the formation of sp 3 hybridized bonds in the DLC film on the γ-Fe substrate. On the other hand, the highest sp 3 fraction in DLC film deposited on the AISI 316L substrate in this study was comparable to that deposited on Si or glass substrates [46,50,51].…”

Section: Discussionsupporting

confidence: 46%

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Dinh

Lich

et al. 2021

Materials

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With the recent significant advances in micro- and nanoscale fabrication techniques, deposition of diamond-like carbon films on stainless steel substrates has been experimentally achieved. However, the underlying mechanism for the formation of film microstructures has remained elusive. In this study, the growth processes of diamond-like carbon films on AISI 316L substrate are studied via the molecular dynamics method. Effects of substrate bias voltage on the structure properties and sp3 hybridization ratio are investigated. A diamond-like carbon film with a compact structure and smooth surface is obtained at 120 V bias voltage. Looser structures with high surface roughness are observed in films deposited under bias voltages of 0 V or 300 V. In addition, sp3 fraction increases with increasing substrate bias voltage from 0 V to 120 V, while an opposite trend is obtained when the bias voltage is further increased from 120 V to 300 V. The highest magnitude of sp3 fraction was about 48.5% at 120 V bias voltage. The dependence of sp3 fraction in carbon films on the substrate bias voltage achieves a high consistency within the experiment results. The mechanism for the dependence of diamond-like carbon structures on the substrate bias voltage is discussed as well.

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Section: Discussionsupporting

confidence: 46%

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Dinh

Lich

et al. 2021

Materials

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“…For more quantitative analysis, the indentation radius of the tip was calibrated to be 4 nm by correcting the measured E * ( Figure S4 ) on the basis of the well-known modulus of SiO 2 (∼72 GPa). 28 , 29 Finally, E s was extracted from the measured value of E * using eq 5 .…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Note that a diamond-coated tip with high stiffness ( E t = 1050 GPa, k = 40 N/m, Micro Star Technologies) was employed to minimize the tip effect. For more quantitative analysis, the indentation radius of the tip was calibrated to be 4 nm by correcting the measured E * (Figure S4) on the basis of the well-known modulus of SiO 2 (∼72 GPa). , Finally, E s was extracted from the measured value of E * using eq .…”

Section: Experimental Methodsmentioning

confidence: 99%

Fatigue-Induced Surface Modification of Zr-Based Metallic Glass under Environmental Conditions

et al. 2022

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Metallic glass (MG), an intrinsic heterogeneous structure at the atomic scale, is one of the promising engineering materials with intriguing physical properties. MG often suffers from the fatigue issue caused by the repetitive mechanical loading, but it is still elusive how the local heterogeneity evolves and affects the macroscale fatigue and deformation against bulky external stress. In this study, we investigate the fatigue effect in Zr−Cu−Al ribbon using a bending fatigue method. We used scanning probe microscopy (SPM) in parallel with X-ray diffraction and X-ray photoelectron spectroscopy to figure out the loading effect on the local heterogeneities. The spatially resolved SPM images show that there is a local fluctuation of mechanical and electrical properties on the fatigued side along with morphological deformation compared to the unloaded side. Approaching the broken edge where the fatigue failure occurs, the decaying tendency is not only more dominant but also accelerated by surface oxidation of the fatigued regions. Our study provides a useful guideline on how to monitor structural changes of MGs under fatigue conditions in service and will open a door toward commercialization of high-performance structural engineering materials.

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“…A graphitic phase of deposited carbon films reduces the friction coefficient in the vacuum medium [34]. Carbon films having lowered hydrogen content were deposited by tuning the ratio of the graphitic phase to the diamond phase [35].…”

Section: Mohs Hardness Of Carbon Materials Estimated Graphicallymentioning

confidence: 99%

Atomic Structure and Binding of Carbon Atoms

Ali¹

2022

Preprint

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Many studies discuss carbon-based materials because of the versatility of carbon elements. Depending on the processing conditions of a carbon precursor, carbon changes state behavior. The electron transfer mechanism occurred to convert carbon from one state to another. In conversion, the dash-shaped energy bits involved transferring electrons to nearby unfilled states. The involved dash-shaped energy has partially conserved behavior. A transferring electron is also under partially conserved forces. Carbon atoms equally evolve and equally develop structures of one dimension, two dimensions, and four dimensions, respectively, when in the graphite, nanotube, and fullerene states. Here, the already associated dash-shaped energy bits bind the carbon atoms. A two-dimensional graphite structure or amorphous carbon structure also forms. The structural formations in diamond, lonsdaleite, and graphene state atoms involve different shaped bits of energy. The bit of energy has a shape like a golf stick. By involving four bits of golf-stick-shaped energy, all four electrons of the outer ring of the depositing diamond state atom undertake an additional clamp of all four energy knots of the outer ring of the deposited diamond state atom. A depositing diamond state atom binds to the deposited diamond state atom from the east-west surface to the south. Growth is from the south to the east-west surface, so the structure of the diamond is a tetra-electron topological structure. The lonsdaleite state atoms bind from the surface east-west to a bit south. However, in glassy carbon, the layers of gaseous, graphite, and lonsdaleite state atoms bind simultaneously. The order of these layers repeats in the growth process of glassy carbon. The carbon-based materials also study Mohs hardness.

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Tailored Hydrogen-Free Carbon Films by Tuning the sp²/sp³ Configuration

Cited by 22 publications

References 62 publications

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Fatigue-Induced Surface Modification of Zr-Based Metallic Glass under Environmental Conditions

Atomic Structure and Binding of Carbon Atoms

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Tailored Hydrogen-Free Carbon Films by Tuning the sp2/sp3 Configuration

Cited by 22 publications

References 62 publications

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Effects of Substrate Bias Voltage on Structure of Diamond-Like Carbon Films on AISI 316L Stainless Steel: A Molecular Dynamics Simulation Study

Fatigue-Induced Surface Modification of Zr-Based Metallic Glass under Environmental Conditions

Atomic Structure and Binding of Carbon Atoms

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Tailored Hydrogen-Free Carbon Films by Tuning the sp²/sp³ Configuration