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Spins and microstructure of hydrogenated amorphous carbon: A multiple frequency electron paramagnetic resonance study
Von Bardeleben, H.J., Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France.
Groupe de Physique des Solides, Universités Paris 6 And 7, UMR 75-88 au CNRS, 2 place Jussieu, 75251 Paris Cedex 05, France.
Université de Picardie, LPMC, 33rue St. Leu, F-80038 Amiens, France.
Université de Picardie, LPMC, 33rue St. Leu, F-80038 Amiens, France, Ctr. for Interdisc. Plasma Science, Max Planck Inst. fur Plasmaphysik, D-85748 Garching, Germany.
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2001 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 78, no 19, p. 2843-2845Article in journal (Refereed) Published
Abstract [en]

Polymer-like and diamond-like hydrogenated amorphous carbon films, characterized by high spin concentrations of 1020 cm-3, have been studied by multiple frequency electron paramagnetic resonance (EPR) spectroscopy at 9, 35, and 94 GHz. Whereas the low-frequency measurements show only one single symmetric EPR line, the high-frequency measurements reveal the anisotropic nature of the g tensor. They show the presence of two different paramagnetic centers with anisotropic g tensors of g?(1) = 2.005, g?(1) ˜ 2.003, and g?(2) = 2.010, g?(2) ˜ 2.003. We attribute both to localized p states on nanosized sp2 graphitic clusters. The g? values of the g tensors, which are correlated to the size of the graphite like carbon clusters, indicate two different cluster sizes with values below 50 Å. © 2001 American Institute of Physics.

Place, publisher, year, edition, pages
2001. Vol. 78, no 19, p. 2843-2845
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Natural Sciences
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URN: urn:nbn:se:liu:diva-47389DOI: 10.1063/1.1370980OAI: oai:DiVA.org:liu-47389DiVA, id: diva2:268285
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-12-13

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