29Si and 13C Solid-state NMR spectroscopic study of nanometer-scale structure and mass fractal characteristics of amorphous polymer derived silicon oxycarbide ceramics

S. J. Widgeon, S. Sen, G. Mera, E. Ionescu, R. Riedel, A. Navrotsky

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

Polymer derived silicon oxycarbide ceramics (SiOC-PDCs) with widely different carbon contents have been synthesized, and their structures have been studied at different length scales using high-resolution 13C and 29Si magic-angle-spinning (MAS) NMR spectroscopic techniques. The data suggest that the structure of these PDCs consists of a continuous mass fractal backbone of corner-shared SiCxO4-x tetrahedral units with "voids" occupied by sp2-hybridized graphitic carbon. The oxygen-rich SiCxO4-x units are located at the interior of this backbone with a mass fractal dimension of ~2.5 while the carbonrich units display a slightly lower dimensionality and occupy the interface between the backbone and the free carbon nanodomains.

Original languageEnglish (US)
Pages (from-to)6221-6228
Number of pages8
JournalChemistry of Materials
Volume22
Issue number23
DOIs
StatePublished - Dec 14 2010
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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