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Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part II: Cobalt Catalyst
Author(s) -
Vakifahmetoglu Cekdar,
Colombo Paolo,
Carturan Sara Maria,
Pippel Eckhard,
Woltersdorf Jörg
Publication year - 2010
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.1551-2916.2010.03974.x
Subject(s) - pyrolysis , materials science , catalysis , ceramic , chemical engineering , silicon carbide , cobalt , carbide , nanowire , nitride , polymer , porosity , silicon nitride , silicon , composite material , nanotechnology , metallurgy , organic chemistry , chemistry , layer (electronics) , engineering
Via catalyst‐assisted pyrolysis, Si 3 N 4 and SiC nanowires were produced on the cell walls of polymer‐derived ceramic foams. The pyrolysis atmosphere and temperature were the main parameters affecting their development: silicon nitride single‐crystal nanowires formed under nitrogen, while silicon carbide ones were produced under argon, and their amount increased with the increasing pyrolysis temperature. Brunauer–Emmett–Teller analysis showed that the presence of the nanowires afforded high specific surface area (SSA) values to the macroporous ceramic foams, ranging from 10 to 110 m 2 /g. Co‐containing samples developed higher SSA values, especially after pyrolysis at 1400°C in N 2 , than samples containing Fe as a catalyst. The differences were explained in terms of morphology (diameter and assemblage), which depended on the processing conditions and the catalyst type (Co or Fe).