Laser fluence dependence of the elastic properties of diamond-like carbon films prepared by pulsed-laser deposition

Liu, Xiao; Metcalf, Thomas; Mosaner, Paolo; Miotello, A.

doi:10.1016/j.apsusc.2007.01.021

Cited by 5 publications

(8 citation statements)

References 29 publications

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“…We also note that CMG resonator Q s show a 15× increase over the highest Q s reported at RT for pristine graphene drums, which illustrate the importance of mechanical tunability versus an untunable though structurally perfect starting material. We anticipate significant Q enhancement for CMG resonators at cryogenic temperatures based on the temperature dependence of the internal friction for disordered carbon . A comparison of the low-temperature behavior of the dissipation in high- Q CMG resonators to pure graphene can provide further insights regarding the microscopic structure and the nature of the dissipation mechanism.…”

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confidence: 93%

“…We anticipate significant Q enhancement for CMG resonators at cryogenic temperatures based on the temperature dependence of the internal friction for disordered carbon. 36 A comparison of the low-temperature behavior of the dissipation in high-Q CMG resonators to pure graphene 37 can provide further insights regarding the microscopic structure and the nature of the dissipation mechanism.…”

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confidence: 99%

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Engineering Graphene Mechanical Systems

et al. 2012

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We report a method to introduce direct bonding between graphene platelets that enables the transformation of a multilayer chemically modified graphene (CMG) film from a "paper mache-like" structure into a stiff, high strength material. On the basis of chemical/defect manipulation and recrystallization, this technique allows wide-range engineering of mechanical properties (stiffness, strength, density, and built-in stress) in ultrathin CMG films. A dramatic increase in the Young's modulus (up to 800 GPa) and enhanced strength (sustainable stress ≥1 GPa) due to cross-linking, in combination with high tensile stress, produced high-performance (quality factor of 31,000 at room temperature) radio frequency nanomechanical resonators. The ability to fine-tune intraplatelet mechanical properties through chemical modification and to locally activate direct carbon-carbon bonding within carbon-based nanomaterials will transform these systems into true "materials-by-design" for nanomechanics.

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confidence: 93%

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confidence: 99%

Engineering Graphene Mechanical Systems

et al. 2012

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“…Studies have shown that the sp 3 /sp 2 ratio is not linearly varying with the laser fluence [32][33][34]. For low fluence regimes (2-3 J/cm 2 ), the structure is mainly sp 2 based, ordered at nanoscale in form of rings.…”

Section: Nanoindentation Testsmentioning

confidence: 99%

“…Therefore, it is possible that the mechanical properties of such structures to be lower. At 5 J/cm 2 , which [34] considers it as threshold, the disordered sp 2 phase starts to transform in tetrahedral bonded amorphous structure. The larger percentage of sp 3 should be the main reason for better values of hardness and elastic modulus in case of such films.…”

Section: Nanoindentation Testsmentioning

confidence: 99%

An Experimental Study on Nano-Carbon Films as an Anti-Wear Protection for Drilling Tools

et al. 2017

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Carbon thin films of 50-100 nm thickness were synthesized by Pulsed Laser Deposition in vacuum at different laser fluences from 2 to 6 J/cm 2 . The deposited films were characterized by Raman spectroscopy for compositional assessment, scanning electron microscopy for morphology/thickness evaluations, and X-ray reflectivity for density, thickness, and roughness determinations. The films were~100 nm thin, smooth, droplet-free, made of a-C:H type of diamond-like carbon. The mechanical properties of synthesized films were studied by nanoindentation and adhesion tests. The films that were obtained at low laser fluences (2, 3 J/cm 2 ) had better mechanical properties as compared to those synthesized at higher fluences. The mean values of hardness were around 20 GPa, while the friction coefficient was 0.06. The deposition conditions of carbon thin films that displayed the best mechanical properties were further used to coat commercial drills. Both uncoated and coated drills were tested on plates that were made of three types of steel: Stainless steel 304, general use AISI 572 Gr 65 steel (OL60), and AISI D3 tool steel (C120). All of the drill edges and tips were studied by optical and scanning electron microscopes. The coated samples were clearly found to be more resistant, and displayed less morphological defects than their uncoated counterparts when drilling stainless steel and OL60 plates. In the case of C120 steel, carbon coatings failed because of the high friction between drill and the metal plate resulting in tip edges blunting that occurred during processing.

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“…Optimizing these parameters one can desirably tailor the hybridization state of carbon atoms to improve the tribological properties such as low friction coefficient and high wear resistance of DLC film. [30][31][32] In spite of several works mentioned above on DLC film produced by PLD technique, the relationship of power density and formation of sp 3 /sp 2 ratio in amorphous structure on the two different classes of substrates is not well understood. Therefore, the present investigation aims to study the laser power density dependent hybridization state of carbon atoms on technologically important class of substrates like silicon and steel and their correlation with friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Impact of laser power density on tribological properties of Pulsed Laser Deposited DLC films

et al. 2013

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Fabrication of wear resistant and low friction carbon films on the engineered substrates is considered as a challenging task for expanding the applications of diamond-like carbon (DLC) films. In this paper, pulsed laser deposition (PLD) technique is used to deposit DLC films on two different types of technologically important class of substrates such as silicon and AISI 304 stainless steel. Laser power density is one of the important parameter used to tailor the fraction of sp2 bonded amorphous carbon (a-C) and tetrahedral amorphous carbon (ta-C) made by sp3 domain in the DLC film. The I(D)/I(G) ratio decreases with the increasing laser power density which is associated with decrease in fraction of a-C/ta-C ratio. The fraction of these chemical components is quantitatively analyzed by EELS which is well supported to the data obtained from the Raman spectroscopy. Tribological properties of the DLC are associated with chemical structure of the film. However, the super low value of friction coefficient 0.003 is obtained when the film is predominantly constituted by a-C and sp2 fraction which is embedded within the clusters of ta-C. Such a particular film with super low friction coefficient is measured while it was deposited on steel at low laser power density of 2 GW/cm2. The super low friction mechanism is explained by low sliding resistance of a-C/sp2 and ta-C clusters. Combination of excellent physical and mechanical properties of wear resistance and super low friction coefficient of DLC films is desirable for engineering applications. Moreover, the high friction coefficient of DLC films deposited at 9GW/cm2 is related to widening of the intergrain distance caused by transformation from sp2 to sp3 hybridized structure.

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Laser fluence dependence of the elastic properties of diamond-like carbon films prepared by pulsed-laser deposition

Cited by 5 publications

References 29 publications

Engineering Graphene Mechanical Systems

Engineering Graphene Mechanical Systems

An Experimental Study on Nano-Carbon Films as an Anti-Wear Protection for Drilling Tools

Impact of laser power density on tribological properties of Pulsed Laser Deposited DLC films

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