Roth, Felix ; Waleska, Philipp S. ; Hess, Christian ; Ionescu, Emanuel ; Nicoloso, Norbert (2016)
UV Raman spectroscopy of segregated carbon in silicon oxycarbides.
In: Journal of the Ceramic Society of Japan, 124 (10)
doi: 10.2109/jcersj2.16100
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Polymer-derived silicon oxycarbides exhibiting ≤1 and 10 vol.% of segregated carbon finely dispersed within a glassy SixOyCz matrix have been investigated by UV Raman spectroscopy using a laser excitation of 4.8 eV (λ = 256.7 nm). Carbon exists as amorphous sp2–sp3 bonded component in SiOC/C (≤1 vol.%) pyrolyzed at 1100°C in H2, including C–C single bonds, polymeric chains and small polycyclic aromatic hydrocarbons (PAHs). The formation of nanocrystalline carbon at T > 1400°C is seen in the Raman spectra of SiOC/C (≤1 vol.%) and SiOC/C (10 vol.%) by the appearance of the G band of graphite. Tempering at 1600°C increases the degree of order within the carbon phase. However, the slight narrowing of the G peak with processing temperature (by about 5%) indicates still not well-crystallized carbon: the Raman results can be best explained by turbostratic carbon (with a lateral size La of ≈2 nm) and do not support the model description in literature as a network of single layer graphene.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Roth, Felix ; Waleska, Philipp S. ; Hess, Christian ; Ionescu, Emanuel ; Nicoloso, Norbert |
| Art des Eintrags: | Bibliographie |
| Titel: | UV Raman spectroscopy of segregated carbon in silicon oxycarbides |
| Sprache: | Englisch |
| Publikationsjahr: | 2016 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the Ceramic Society of Japan |
| Jahrgang/Volume einer Zeitschrift: | 124 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.2109/jcersj2.16100 |
| Kurzbeschreibung (Abstract): | Polymer-derived silicon oxycarbides exhibiting ≤1 and 10 vol.% of segregated carbon finely dispersed within a glassy SixOyCz matrix have been investigated by UV Raman spectroscopy using a laser excitation of 4.8 eV (λ = 256.7 nm). Carbon exists as amorphous sp2–sp3 bonded component in SiOC/C (≤1 vol.%) pyrolyzed at 1100°C in H2, including C–C single bonds, polymeric chains and small polycyclic aromatic hydrocarbons (PAHs). The formation of nanocrystalline carbon at T > 1400°C is seen in the Raman spectra of SiOC/C (≤1 vol.%) and SiOC/C (10 vol.%) by the appearance of the G band of graphite. Tempering at 1600°C increases the degree of order within the carbon phase. However, the slight narrowing of the G peak with processing temperature (by about 5%) indicates still not well-crystallized carbon: the Raman results can be best explained by turbostratic carbon (with a lateral size La of ≈2 nm) and do not support the model description in literature as a network of single layer graphene. |
| Freie Schlagworte: | UV Raman spectroscopy, Carbon, Graphite, Graphene, Nanocomposites, Polymer-derived ceramics |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 07 Fachbereich Chemie 07 Fachbereich Chemie > Eduard Zintl-Institut > Fachgebiet Physikalische Chemie |
| Hinterlegungsdatum: | 14 Sep 2016 05:31 |
| Letzte Änderung: | 23 Jan 2019 13:44 |
| PPN: | |
| Sponsoren: | Financial support by the Deutsche Forschungs- gemeinschaft (DFG, Ri 510 / 52-1 and INST, 163 / 130-1 FUGG) is gratefully acknowledged. |
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