Study of the pyrolysis process of an hybrid CH 3 SiO 1.5 gel into a SiCO glass

Gobind Das, Paolo Bettotti*, Luigi Ferraioli, Rishi Raj, Gino Mariotto, Lorenzo Pavesi, Gian Domenico Sorarù

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    51 Scopus citations

    Abstract

    Silicon oxycarbide samples were prepared by polymer pyrolysis using a methyltriethoxysilane-derived precursor. Transparent crack-free gel samples were obtained from the alkoxide by the sol-gel process. The dried gel samples were pyrolysed at different temperatures in the range between 400 and 1500 °C in Ar atmosphere. The chemical and microstructural evolution during pyrolysis were followed by FT-IR absorption, Raman scattering and photoluminescence (PL). The FT-IR spectra show the change in Si-O-Si asymmetric stretching, C-H x , Si-CH 3 stretching vibrational bands. The peak position and shape of these bands were found stable up to 600 °C. Above this temperature, a remarkable change in shape and peak position of Si-O-Si related vibration, reduction in C-H x and Si-CH 3 stretching absorption bands have been observed. Degradation of Si-CH 3 and the simultaneous formation of Si-CH 2 -Si via Si-CH 2 -CH 2 -Si is explicitly observed, experimentally. Annealing the sample at 800 °C starts to show the clear presence of D and G bands, related to the free carbon precipitation and its segregation with the temperature. The broad PL spectra centered at around 670 nm for the samples pyrolysed at 1500 °C shows an important information regarding the presence of crystalline SiC.

    Original languageEnglish (US)
    Pages (from-to)61-68
    Number of pages8
    JournalVibrational Spectroscopy
    Volume45
    Issue number1
    DOIs
    StatePublished - Oct 18 2007

    Keywords

    • FT-IR and Raman spectroscopy
    • Photoluminescence
    • Polymer pyrolysis
    • Silicon oxycarbide

    ASJC Scopus subject areas

    • Spectroscopy

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