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Correlation Between Intrinsic Microstructure and Piezoresistivity in a SiOC Polymer‐Derived Ceramic
Author(s) -
Toma Liviu,
Kleebe HansJoachim,
Müller Mathis M.,
Janssen Enrico,
Riedel Ralf,
Melz Tobias,
Hanselka Holger
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04944.x
Subject(s) - materials science , crystallization , amorphous solid , microstructure , composite material , annealing (glass) , polymer , ceramic , crystallite , transmission electron microscopy , pyrolysis , chemical engineering , porosity , nanotechnology , crystallography , chemistry , engineering , metallurgy
Transmission electron microscopy was performed on a carbon‐containing SiOC material derived from a polymer precursor pyrolyzed at 1100°C and subsequently annealed at 1400°C. The TEM study focused on the correlation between micro/nanostructure evolution and the piezoresistivity monitored on the annealed sample. Upon pyrolysis, the material was completely amorphous with no local crystallization of the thermodynamically stable phases. Upon annealing, however, the formation of turbostratic carbon and SiC was observed. Unexpectedly, crystallization only occurred within intrinsic pores while the bulk of the sample remained amorphous. As the nanopores formed a percolation network throughout the entire material, the piezoresistive effect is predominantly a consequence of turbostratic carbon formation inside the residual porosity.