Thermal expansion coefficient of hydrogenated amorphous carbon

Marques, F. C.; Lacerda, R. G.; Champi, A.; Stolojan, Vlad; Cox, D. C.; Silva, S. Ravi P.

doi:10.1063/1.1619557

Cited by 92 publications

(38 citation statements)

References 15 publications

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“…These elastic modulus values are in good agreement with the values obtained from hydrogenated amorphous carbon films with sp 2 -bonded carbon fraction of ϳ0.65, by Marques et al 39 The low measured hardness of each EBID film is consistent with a-C:H films deposited from hydrocarbon plasma at low bias voltage ͑200 V ; H Ͻ 5 GPa͒. 40,41 It is well known that the mechanical properties of plasma-deposited a-C:H depend mainly on the energy with which the hydrocarbon precursors impact the growing surface and the amount of hydrogen in the film.…”

Section: Resultssupporting

confidence: 81%

“…The projected areas obtained by the AFM from the indentation were used to calibrate the hardness and elastic modulus values. Poisson's ratio for hydrogenated amorphous carbon films was measured to be 0.25± 0.05 by Marques et al 39 and this Poisson's ratio value was used to calculate the elastic modulus using the obtained nanoindentation load-displacement data. With the indentation projected area calibration, the hardness and elastic modulus values of the films deposited under 3, 12, and 20 kV were fitted as 3.6± 0.3, 4.0± 0.2, and 4.4± 0.2 GPa, and 34.3± 3.4, 46.3± 2.3, and 59.5± 2.5 GPa, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Mechanics of hydrogenated amorphous carbon deposits from electron-beam-induced deposition of a paraffin precursor

Ding

Dikin

Chen

et al. 2005

Journal of Applied Physics

143

162

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Many experiments on the mechanics of nanostructures require the creation of rigid clamps at specific locations. In this work, electron-beam-induced deposition ͑EBID͒ has been used to deposit carbon films that are similar to those that have recently been used for clamping nanostructures. The film deposition rate was accelerated by placing a paraffin source of hydrocarbon near the area where the EBID deposits were made. High-resolution transmission electron microscopy, electron-energy-loss spectroscopy, Raman spectroscopy, secondary-ion-mass spectrometry, and nanoindentation were used to characterize the chemical composition and the mechanics of the carbonaceous deposits. The typical EBID deposit was found to be hydrogenated amorphous carbon ͑a-C:H͒ having more sp 2 -than sp 3 -bonded carbon. Nanoindentation tests revealed a hardness of ϳ4 GPa and an elastic modulus of 30-60 GPa, depending on the accelerating voltage. This reflects a relatively soft film, which is built out of precursor molecular ions impacting the growing surface layer with low energies. The use of such deposits as clamps for tensile tests of poly͑acrylonitrile͒-based carbon nanofibers loaded between opposing atomic force microscope cantilevers is presented as an example application

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Section: Resultssupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Mechanics of hydrogenated amorphous carbon deposits from electron-beam-induced deposition of a paraffin precursor

Ding

Dikin

Chen

et al. 2005

Journal of Applied Physics

143

162

View full text Add to dashboard Cite

show abstract

“…To verify the validity of Eq. (6), C f = 35 J m À2 for DLC films [11,12] is used (other physical constants are listed in Table 1). We thus estimate the average crack spacing (equal to the average size of the film segments), and a good agreement between experiment and theory is attained, as seen in Fig.…”

Section: Discussionmentioning

confidence: 99%

Flexible diamond-like carbon films on rubber: On the origin of self-acting segmentation and film flexibility

et al. 2012

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2012). Flexible diamond-like carbon films on rubber: On the origin of self-acting segmentation and film flexibility. Acta Materialia, 60(15), 5526-5535. https://doi.org/10.1016Materialia, 60(15), 5526-5535. https://doi.org/10. /j.actamat.2012 Copyright Other than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractThis paper reports an experimental approach to deposit flexible diamond-like carbon (DLC) films on hydrogenated nitrile butadiene rubber (HNBR) with plasma-assisted chemical vapor deposition and an analytical model to describe the self-segmentation mechanism of the DLC films. By making use of the substantial thermal expansion mismatch between the DLC films and the rubber substrate, a dense network of cracks forms in the DLC films and contributes to flexibility. The size of the microsegments can be controlled by tuning the temperature variation of the substrate during deposition through varying the substrate bias voltage. The formation mechanism of the crack network and its effect on the flexibility of DLC films coated on rubber are presented.

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“…This FEA is performed using thermal and static-structural analysis in ANSYS 16.2 Academic Version (ANSYS, Inc., Canonsburg, PA, USA, 2015). The material properties used for FEA [49][50][51][52][53][54] are mentioned in Table S1 of the Supplementary Materials. Here, the resultant stress is given by Equation (1) and is popularly known as Stoney's equation [55,56].…”

Section: Physical Reasons Of the Statistically-significant Termsmentioning

confidence: 99%

Determining the Parameters of Importance of a Graphene Synthesis Process Using Design-of-Experiments Method

Narula

Tan

2016

Applied Sciences

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Abstract:A systematic method to identify key factors that control the synthesis of Physical Vapor Deposition (PVD)-based graphene on copper is necessary for engineering graphene growth. The statistical design-of-experiments method is employed and demonstrated in this work in order to fulfill the necessity. Full-factorial design-of-experiments are performed to examine the significance of the main effects and the extent of the interactions of the controlling factors, which are responsible for the number of layers and the quality of the grown graphene. We found that a thinner amorphous carbon layer and a higher annealing temperature are suitable for the growth of mono-layer/few-layer graphene with low defects, while the effect of annealing time has a trade-off and needs to be optimized further. On the other hand, the same treatment, but with larger annealing times will result in multi-layer graphene and low defects. The results obtained from the analysis of the design-of-experiments are verified experimentally with Raman characterization.

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Thermal expansion coefficient of hydrogenated amorphous carbon

Cited by 92 publications

References 15 publications

Mechanics of hydrogenated amorphous carbon deposits from electron-beam-induced deposition of a paraffin precursor

Mechanics of hydrogenated amorphous carbon deposits from electron-beam-induced deposition of a paraffin precursor

Flexible diamond-like carbon films on rubber: On the origin of self-acting segmentation and film flexibility

Determining the Parameters of Importance of a Graphene Synthesis Process Using Design-of-Experiments Method

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