Effect of oxidation of copper nanoparticles on absorption spectra of DLC:Cu nanocomposites

Yaremchuk, Iryna; Meškinis, Šarūnas; Bulavinets, Tetiana; Vasiliauskas, Andrius; Andrulevičius, Mindaugas; Fitio, Volodymyr; Bobitski, Yaroslav; Tamulevičius, Sigitas

doi:10.1016/j.diamond.2019.107538

Cited by 19 publications

(10 citation statements)

References 37 publications

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“…No correlation between the plasmonic optical absorption peak and saturable absorption effect was found for the hydrogenated DLC:Cu films. As discussed above, the oxidation of the embedded Cu nanoparticles should be taken into account [32]. Nevertheless, in our case, it can not explain the observed differences between the nonlinear optical properties of hydrogenated and hydrogen-free DLC:Cu films.…”

Section: Surface Morphology and Phase Structure According To Afm Mainmentioning

confidence: 73%

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

et al. 2020

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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.

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Section: Surface Morphology and Phase Structure According To Afm Mainmentioning

confidence: 73%

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

et al. 2020

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“…In good agreement with TPR experiments and XPS analysis (see Figure 6 ), optical changes indicating hydrogen reacting with the material appear already at temperatures as a low as 200 °C. However, the typical peak around 580 nm, indicative of plasmon excitation in Cu nanoparticles, [ 17 , 18 , 19 , 20 ] develops at higher temperatures. This coincides with the post mortem XRD analysis, detecting Cu‐nanoparticles after hydrogen treatment at T > 650°C.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the shoulder at around 500 nm remains, which is assigned to CuO. [ 20 ] Full reversibility is expected to be reached at higher temperatures than possible in the optical cell.…”

Section: Resultsmentioning

confidence: 99%

Cataluminescence in Er‐Substituted Perovskites

et al. 2021

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Thermophotovoltaic devices have promising applications for energy conversion. However, current conversion efficiency of chemical energy to light is very low, limited by the competing process of heat dissipation released as black body radiation. From a fundamental point of view, the direct conversion of chemical energy into light without this detour is possible. This so called cataluminescence from methanol combustion over Er-substituted SrTiO 3 with high efficiency is demonstrated. The catalytically active quaternary perovskites Er 0.15 La 0.15 Sr 0.55 Ti 0.95 Cu 0.05 O 3 − exsolute and reabsorb metallic Cu particles onto the surface in reducing and oxidizing conditions, respectively. Thus, it is able to manipulate the surface structure and investigate its influence on the catalytic as well as luminescent properties. The fuel to air ratio around the stoichiometry point changes the conditions from reducing to oxidizing and thereby alters the surface properties. This is evidenced by post mortem X-ray diffraction and X-ray photoemission as well as operando optical spectroscopy. Cataluminescence takes place under oxidizing conditions (lean fuel to air mixture) on the Er-perovskite oxide with a strong selective near infrared emission, while reducing conditions stimulate formation of plasmonic Cu-nanoparticles, which emit black body radiation.

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“…According to the calculation based on Mie theory, Cu nanoparticles (CuNPs) possess strong localized surface plasmon resonance (LSPR) in the range of 500-600 nm [1,2] and also copper is much cheaper than gold and silver, but the applications based on the LSPRs of CuNPs are far less than those based on the LSPRs of AuNPs and AgNPs. One of the main reasons is that CuNPs are easily oxidized in air [3,4], which damps the LSPR intensity seriously. Exploring ways to retarding the oxidation of CuNPs is urgent for the practical applications based on the LSPRs of CuNPs.…”

Section: Introductionmentioning

confidence: 99%

Maintaining the localized surface plasmon resonance of copper nanoparticles by defective TiO2 thin films

et al. 2021

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The localized surface plasmon resonance (LSPR) of copper nanoparticles (CuNPs) damps quickly in air due to the easy oxidation of copper atoms. Finding ways to retard the oxidation of CuNPs is critical for the applications based on the LSPR of CuNPs. In this paper, we report on a new method to maintaining the LSPR of CuNPs by deposition of CuNPs on TiO 2 thin films in vacuum followed by annealing in nitrogen ambient. The anti-oxidation properties of the CuNPs were improved greatly. In three days, the LSPR intensities at 532 and 633 nm were reduced by only 40 and 32%, respectively. This method is simple and cost-effective.

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Effect of oxidation of copper nanoparticles on absorption spectra of DLC:Cu nanocomposites

Cited by 19 publications

References 37 publications

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

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

Cataluminescence in Er‐Substituted Perovskites

Maintaining the localized surface plasmon resonance of copper nanoparticles by defective TiO2 thin films

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