Radiation induced changes in amorphous hydrogenated DLC films

Adlienė, Diana; Laurikaitienė, Jurgita; Kopustinskas, V.; Meškinis, Šarūnas; Šablinskas, Valdas

doi:10.1016/j.mseb.2008.06.005

Cited by 20 publications

(6 citation statements)

References 32 publications

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“…We could identify a sharp valley at 1633 cm -1 as WS 2 , although the signal in the 1400-1800 cm -1 region was particularly noisy. The same reason hinders the identification of possible Cr 2 O 3 peaks that should appear at 1450 and 1490 cm -1 [19] as well as C-C bonds at 1640 cm -1 [20]. [24] and Cr-O bond detected by XPS (see above).…”

Section: Chemical Compositionmentioning

confidence: 99%

“…The same reason hinders the identification of possible Cr 2 O 3 peaks that should appear at 1450 and 1490 cm À119 as well as C-C bonds at 1640 cm À1 . 20 Raman spectroscopy is a very sensitive method for the chemical identification and the structural analysis of WS 2 and carbon. 2H-WS 2 single crystals have 4 Raman active crystal vibrations at the G-point of the reciprocal unit cell: A 1g (421 cm À1 ), E 2g (1) (356 cm À1 ), E 1g (306 cm À1 ), and E 2g (2) (27 cm À1 ).…”

Section: Coating Characterizationmentioning

confidence: 99%

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Complex frictional analysis of self-lubricant W-S-C/Cr coating

et al. 2012

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Transition metal dichalcogenides belong to one of the most developed class of materials for solid lubrication. However, one of the main drawbacks of most of the self-lubricating coatings is their low load-bearing capacity, particularly in terrestrial atmospheres. In our previous works, alloying thin films based on tungsten disulfide with non-metallic interstitial elements, such as carbon or nitrogen, has been studied in order to improve tribological performance in different environments.Excellent results were reached with the deposited coatings hardness, in some cases, more than one order of magnitude higher than single W-S films. 2In this work, W-S-C films were deposited with increasing Cr contents by co-sputtering chromium and composite WS 2 -C and targets. Two films were prepared with approx. 7 and 13 at.% of Cr.Alloying with chromium led to dense films with amorphous microstructure; the hardness and adhesion was improved. Sliding tests were carried out in dry and humid air using pin-on-disc with 100Cr6 steel ball as a counterpart. To analyse the sliding process, the surfaces in the contact were investigated by X-ray photoelectron spectroscopy (bonding), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy (TEM). Surface and sub-surface structural modification of the coating and composition of the transferred tribolayer are discussed in detail. High friction in humid air was attributed to the absence of well-ordered WS 2 sliding interface. On the other hand, the existence of such interface explained a very low friction observed in dry air.

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Section: Chemical Compositionmentioning

confidence: 99%

Section: Coating Characterizationmentioning

confidence: 99%

Complex frictional analysis of self-lubricant W-S-C/Cr coating

et al. 2012

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“…In general, optical transmittance is higher if the samples include higher 𝑠𝑝 3 fraction. [12] Therefore the deposition temperature has an apparent influence on DLC film bonding structure. This optical transmission evolution can be explained as the change of bonding structure caused by the thermal effects.…”

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confidence: 99%

Optical and Electrical Properties Evolution of Diamond-Like Carbon Thin Films with Deposition Temperature

Ding

Liu

Kong

2009

Chinese Phys. Lett.

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Optical and electrical properties of diamond-like carbon (DLC) films deposited by pulsed laser ablation of graphite target at different substrate temperatures are reported. By varying the deposition temperature from 400 to 25 ∘ C, the film optical transparency and electrical resistivity increase severely. Most importantly, the transparency and resistivity properties of the DLC films can be tailored to approaching diamond by adjusting the deposition temperature, which is critical to many applications. DLC films deposited at low temperatures show excellent optical transmittance and high resistivity. Over the same temperature regime an increase of the 𝑠𝑝 3 bonded C content is observed using visible Raman spectroscopy, which is responsible for the enhanced transparency and resistivity properties.

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“…[15][16][17][18][19][20] DLC films are widely used for industrial applications due to their superior structural and functional properties. [1][2][3][4][5][6][7][8][9] These films possess many properties similar to pure diamond films such as high hardness, low friction coefficient, scratch resistance, good thermal conductivity, optical transparency, high electrical resistivity, low electron affinity, chemical inertness, nontoxicity, 2-6 etc. All of these outstanding properties make this material attractive for a large number of investigations.…”

Section: Introductionmentioning

confidence: 99%

“…9 DLC thin films have been proved to be prepared by physical or chemical methods. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In particular, plasma enhanced chemical vapor deposition (PECVD) has extensively been used for the preparation of hydrogenated DLC films using DC plasma, RF plasma, and microwave plasma. [16][17][18][19] In these cases, a hydrocarbon gas is usually used as precursor and hydrogenated DLC films are obtained.…”

Section: Introductionmentioning

confidence: 99%

Effect of Repetition Rates of Laser Pulses on Microstructure and Optical Properties of Diamond-Like Carbon Films

Ding

Kong

2009

Int. J. Mod. Phys. B

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Hydrogen-free diamond-like carbon (DLC) thin films were prepared at different repetition rates of laser pulses by pulsed laser ablation of graphite target at room temperature. The microstructure of the thin films was characterized by Raman spectroscopy. Raman measurements showed that sp 3 bonded carbon fraction is reduced with increase of repetition rates of laser pulses from 5 to 20 Hz. Optical properties, namely photoluminescence (PL), optical absorption, extinction coefficient (k), and refractive index (n), were measured by fluorescence spectrophotometer, scanning spectrophotometer, and spectroscopic ellipsometer. By changing the repetition rates of laser pulses from 5 to 20 Hz, the PL and optical absorption were gradually increased, while the deposition rate and optical band gap of the films decreased strictly with the increase of repetition rate. The extinction coefficient (k) and refractive index (n) were found to be in the range of 0.468-0.938 and 1.92-2.27, respectively. These results indicate that repetition rate of laser pulses has a strong influence on the microstructure and optical properties of the films. Based on the experimental results, a possible causation about the effect of repetition rate on PL was proposed.

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Radiation induced changes in amorphous hydrogenated DLC films

Cited by 20 publications

References 32 publications

Complex frictional analysis of self-lubricant W-S-C/Cr coating

Complex frictional analysis of self-lubricant W-S-C/Cr coating

Optical and Electrical Properties Evolution of Diamond-Like Carbon Thin Films with Deposition Temperature

Effect of Repetition Rates of Laser Pulses on Microstructure and Optical Properties of Diamond-Like Carbon Films

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