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1897. Heterogeneous surface recombination of oxygen atoms on vertically oriented multilayer graphene sheets deposited on a metal substrateDomen Paul, Miran Mozetič, Gregor Primc, Alenka Vesel, Sandra Drev, Rok Zaplotnik, 2025, original scientific article Abstract: The kinetics of surface recombination of neutral oxygen atoms on nanocarbon deposited on oxidized cobalt catalyst in inductively coupled radiofrequency plasma sustained in propane in the H-mode is presented. The coefficient was measured in the range of temperatures between 300 and 800 K and pressures between 40 and 200 Pa. A deep minimum in the coefficient at 0.03–0.06 was observed and explained by a deposition of a rather smooth carbon film on the cobalt catalyst. Prolonged deposition caused the growth of perpendicularly oriented multilayer graphene sheets with the distance between the neighboring sheets around 100 nm. The large aspect ratio of the gaps, whose depth reached several micrometers after deposition time over 100 s, caused the trapping of oxygen atoms and, thus, numerous collisions with the graphene-like surface, so the coefficient increased for over an order of magnitude. The maximum coefficient over 0.5 was observed at low pressures and elevated temperatures. The evolution of the recombination coefficient was explained by the peculiarities of the binding sites for oxygen atoms on graphene surfaces.
Keywords: carbon nanowalls, plasma, oxygen, chemical vapor deposition
Published in DiRROS: 17.06.2025; Views: 480; Downloads: 308
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1898. Acta dermatovenerologica Alpina, Panonica et Adriatica1992, not set Abstract: Acta Dermatovenerologica Alpina, Pannonica et Adriatica (ISSN 1318-4458) is an open access medical journal published quarterly by the Association of Slovenian Dermatovenerologists.
The journal aims to publish papers describing all aspects of research in dermatology and venereology. Acta Dermatovenerologica Alpina, Pannonica et Adriatica invites submissions under a broad scope of topics relevant to clinical and experimental research in dermatovenereology and publishes original articles, reviews, case reports, and letters to the editors.
Published in DiRROS: 17.06.2025; Views: 446; Downloads: 120
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