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Open AccessArticle

Hydrogen-Free Diamond Like Carbon Films with Embedded Cu Nanoparticles: Structure, Composition and Reverse Saturable Absorption Effect

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Institute of Materials Science, Kaunas University of Technology, K. Baršausko St. 59, LT-51423 Kaunas, Lithuania
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JSC Ekspla, Savanorių 237, LT-02300 Vilnius, Lithuania
*
Author to whom correspondence should be addressed.
Materials 2020, 13(3), 760; https://doi.org/10.3390/ma13030760
Received: 2 January 2020 / Revised: 20 January 2020 / Accepted: 5 February 2020 / Published: 7 February 2020
(This article belongs to the Special Issue Advances in Diamond-Like Carbon (DLC) Films)
In the present research, hydrogen-free diamond like carbon films with embedded copper nanoparticles (DLC:Cu) were grown by simultaneous DC magnetron sputtering of the graphite and copper targets. X-ray photoelectron spectroscopy was used to define the composition of the samples. Atomic force microscopy studies of diamond, like carbon films containing different amount of copper, revealed wide range of the surface morphologies as well as sizes and shapes of the embedded copper nanoclusters. Raman scattering spectra of all the DLC:Cu films investigated were typical for diamond-like carbon (including samples containing more than 60 at.% of copper). sp3/sp2 carbon bond ratio in the films decreased with the increase of the Cu amount in the films. According to the optical absorbance measurements, the surface plasmon resonance related absorption peak of DLC:Cu films was only detected in the films containing 28.45 at.% Cu. For the diamond like carbon films containing more than 40 at.% Cu, a further increase of Cu amount in the nanocomposite resulted in minor changes of the absorbance spectra. Some correlation between the changes of the samples surface morphology as well as phase structure and optical absorbance spectra of the films was found. In all cases, reverse-saturable absorption of the DLC:Cu films was observed. For some DLC:Cu films damage of the sample occurred at higher light fluences that can be related to the heating that is caused by the surface plasmon resonance effect. View Full-Text
Keywords: diamond like carbon films; nanocomposite; embedded copper nanoparticles; surface plasmon resonance; magnetron sputtering; XPS; Raman spectroscopy; AFM; nonlinear optical properties diamond like carbon films; nanocomposite; embedded copper nanoparticles; surface plasmon resonance; magnetron sputtering; XPS; Raman spectroscopy; AFM; nonlinear optical properties
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Meškinis, Š.; Vasiliauskas, A.; Viskontas, K.; Andrulevičius, M.; Guobienė, A.; Tamulevičius, S. Hydrogen-Free Diamond Like Carbon Films with Embedded Cu Nanoparticles: Structure, Composition and Reverse Saturable Absorption Effect. Materials 2020, 13, 760.

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