Antibacterial properties of modified a-C and ta-C coatings: the effects of the sp2/sp3 ratio, oxidation, nitridation, and silver incorporation

Streletskiy, Oleg A.; Zavidovskiy, Ilya A.; Balabanyan, Vadim; Tsiskarashvili, Archil V.

doi:10.1007/s00339-022-06062-2

Cited by 20 publications

(21 citation statements)

References 96 publications

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“…The Raman analysis comes from greater depth than the XPS analysis. It is a familiar fact that the XPS typically shows an increased sp 2 content at the surface [51] due to the proposed mechanism of the sp 3 formation in the a-C layers [52]. Nevertheless, the most important conclusion from this part of the experiment is that the conditions most favorable for generating the a-C layers, with elevated C sp 3 − C sp 3 bond content, are those of the GIMS process, in which the plasma is generated in a volume characterized by low pressure.…”

Section: Resultsmentioning

confidence: 99%

The Amorphous Carbon Thin Films Synthesized by Gas Injection Magnetron Sputtering Technique in Various Gas Atmospheres

et al. 2023

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This work presents the potential for using pulsed gas injection to produce amorphous carbon films. In this experiment, the frequency of injecting small amounts of gas was used to control the pressure amplitudes, thus achieving the conditions of plasma generation from stationary, through quasi-stationary, to pulsed oscillations of pressure. In addition, we used various gases and their mixtures, an alternative to argon. In the experiment, we studied the energy state of the plasma. The films were examined for phase and chemical composition, surface morphology, and optical and mechanical properties. We determined low-frequency pulsed gas injections to be conditions favorable for C(sp3) − C(sp3) bond formation. The plasma generated by gas injections is better ionized than that generated by static pressure. Pulsed conditions favor the plasma species to retain their kinetic energy, limiting the probability of intermolecular collision events. Since helium has a relatively high ionization energy, it is a practical addition to sputtering gas because of the increasing sp3 content in the films. The electrons created by helium ionization improve the plasma’s ionization degree.

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Section: Resultsmentioning

confidence: 99%

The Amorphous Carbon Thin Films Synthesized by Gas Injection Magnetron Sputtering Technique in Various Gas Atmospheres

et al. 2023

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“…It is noteworthy that no peak of metallic Sb was detected, demonstrating that the surface of Bi 1 Sb 1 @C was completely oxidized. Furthermore, the binding energy at 532.2 eV is indexed to the typical C-O band, indicating that oxygen atoms are doped in the carbon matrix [ 21 ]. Oxygen-doped carbon materials can create sufficient Na storage sites and accelerate Na + transportation [ 22 , 23 ].…”

Section: Resultsmentioning

confidence: 99%

Bismuth−Antimony Alloy Embedded in Carbon Matrix for Ultra-Stable Sodium Storage

Tan

et al. 2023

Materials

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Alloy-type anodes are the most promising candidates for sodium-ion batteries (SIBs) due to their impressive Na storage capacity and suitable voltage platform. However, the implementation of alloy-type anodes is significantly hindered by their huge volume expansion during the alloying/dealloying processes, which leads to their pulverization and detachment from current collectors for active materials and the unsatisfactory cycling performance. In this work, bimetallic Bi−Sb solid solutions in a porous carbon matrix are synthesized by a pyrolysis method as anode material for SIBs. Adjustable alloy composition, the introduction of porous carbon matrix, and nanosized bimetallic particles effectively suppress the volume change during cycling and accelerate the electrons/ions transport kinetics. The optimized Bi1Sb1@C electrode exhibits an excellent electrochemical performance with an ultralong cycle life (167.2 mAh g−1 at 1 A g−1 over 8000 cycles). In situ X-ray diffraction investigation is conducted to reveal the reversible and synchronous sodium storage pathway of the Bi1Sb1@C electrode: (Bi,Sb) Na(Bi,Sb) Na3(Bi,Sb). Furthermore, online electrochemical mass spectrometry unveils the evolution of gas products of the Bi1Sb1@C electrode during the cell operation.

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“…The D-line intensity enlargement might also originate from the surface sensitivity of Raman scattering enhanced by nanostructured silver. Apparently, the surface layer was more disordered and sp 2 -enriched than the bulk film, which is typical for the films deposited by ion-plasma methods [59][60][61]. Thus, a slight difference between the spectra of the a-C:ND and a-C:ND/Ag structures may indicate that the subsurface layers of the films were damaged insignificantly by the ion beam, which may be promising for the spectroscopic analysis of organic structures SERS-enhanced by Ag nanoparticles synthesized via the suggested low-energy irradiation technique.…”

Section: Raman Spectroscopymentioning

confidence: 88%

Amorphous Carbon Films with Embedded Well-Dispersed Nanodiamonds: Plasmon-Enhanced Analysis and Possible Antimicrobial Applications

et al. 2022

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An amorphous carbon film with embedded detonation nanodiamond (DND) particles (a-C:ND) was produced by magnetron sputtering of nanodiamond powder. An Ag film was deposited on the carbon structure by radiofrequency magnetron sputtering. The silver film was irradiated with a 150 eV Ar+ to form plasmonic-active nanoparticles (NP) on the surface of the a-C:ND. The structure of the obtained a-C:ND and a-C:ND/Ag structures were studied by scanning and transmission electron microscopy, electron energy-loss spectroscopy, UV–Visible absorption spectroscopy, Raman spectroscopy, and fluorescence lifetime imaging at two-photon excitation. The analysis revealed 76% of sp3-carbon and a good dispersion of diamond nanoparticles in the a-C. Surface-enhanced Raman scattering (SERS) was applied to investigate the a-C:ND/Ag structure, allowing for the observation of SERS from the sp2-carbon species and the absence of significant a-C:ND damage after Ar+ irradiation of the Ag overlayer. A plasmonic-metal-enhanced luminescence was observed at one- and two-photon excitations, revealing a two- to five-fold intensity increase. The activity of the used DNDs was tested using the agar diffusion method and observed against the bacteria of Bacillus subtilis, Staphylococcus aureus, and Escherichia coli and the fungi of Aspergillus niger, Aspergillus fumigatus, and the yeast of Candida albicans, showing DND activity against all the test strains of fungi.

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Antibacterial properties of modified a-C and ta-C coatings: the effects of the sp2/sp3 ratio, oxidation, nitridation, and silver incorporation

Cited by 20 publications

References 96 publications

The Amorphous Carbon Thin Films Synthesized by Gas Injection Magnetron Sputtering Technique in Various Gas Atmospheres

The Amorphous Carbon Thin Films Synthesized by Gas Injection Magnetron Sputtering Technique in Various Gas Atmospheres

Bismuth−Antimony Alloy Embedded in Carbon Matrix for Ultra-Stable Sodium Storage

Amorphous Carbon Films with Embedded Well-Dispersed Nanodiamonds: Plasmon-Enhanced Analysis and Possible Antimicrobial Applications

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