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UV Raman spectroscopy of segregated carbon in silicon oxycarbides

Roth, Felix ; Waleska, Philipp ; Hess, Christian ; Ionescu, Emanuel ; Nicoloso, Norbert (2024)
UV Raman spectroscopy of segregated carbon in silicon oxycarbides.
In: Journal of the Ceramic Society of Japan, 2016, 124 (10)
doi: 10.26083/tuprints-00027289
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: UV Raman spectroscopy of segregated carbon in silicon oxycarbides
Language: English
Date: 29 April 2024
Place of Publication: Darmstadt
Year of primary publication: 2016
Place of primary publication: Tokyo
Publisher: The Ceramic Society of Japan
Journal or Publication Title: Journal of the Ceramic Society of Japan
Volume of the journal: 124
Issue Number: 10
DOI: 10.26083/tuprints-00027289
Corresponding Links:
Origin: Secondary publication service

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.

Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-272899
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry > Eduard Zintl-Institut > Physical Chemistry
Date Deposited: 29 Apr 2024 13:19
Last Modified: 29 Apr 2024 13:19
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/27289
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