Investigation of the morphological changes promoted by heating of Si–C–O ceramics derived from a phenyl-rich hybrid polymer. Effect of Ni in the polymeric precursor

Polymer‐Derived Ceramic Microspheres with Controlled Morphology via Novel Phase Separation‐Assisted Pyrolysis

“…Further, various crystals of α‐Si 3 N 4 , β‐Si 3 N 4 , SiC, δ‐Ni 2 Si, Si 2 N 2 O, and graphitic carbons were formed when being annealed at 1300°C for 2 h. The crystals were identified as α‐Si 3 N 4 (hexagonal, PDF‐83‐0700), β‐Si 3 N 4 (hexagonal, PDF‐83‐0701), Si 2 N 2 O (orthorhombic, PDF‐83‐2148), δ‐Ni 2 Si (orthorhombic, PDF‐73‐2092), SiC (hexagonal, PDF‐89‐2216), and graphitic carbon (hexagonal, PDF‐75‐1621). Similar to the study reported previously, the transition metals such as nickel, iron, and cobalt could promote the formation of crystals of α‐Si 3 N 4 , SiC, and graphitic carbons for the PDC microspheres at an annealing temperature lower that of pure ternary Si–C–N system.…”

Growth of One‐Dimensional Nanostructures in Porous Polymer‐Derived Ceramics by Catalyst‐Assisted Pyrolysis. Part II: Cobalt Catalyst

“…4,12,21 The release of decomposition gases, when pyrolyzing preceramic polymers at high temperature in inert atmosphere, has led some researchers to develop 1D nanostructures in the pores of the formed ceramics via catalyst-assisted pyrolysis (CAP), as discussed in the companion paper (Part I). [22][23][24][25][26][27][28] Using emulsionbased processing of a preceramic polymer-containing transition metals such as Fe, Co, Ni, or Pd, nanofibers consisting of b-SiC/ a-SiO 2 were also very recently obtained in the pores of the produced SiOC foam. 29 An application of this processing concept to the growth of nanofibers on the surface of cellular polymerderived ceramic has been recently pursued by Yoon et al 30 and in our laboratory.…”

Influence of activated charcoal on the structural and morphological characteristics of ceramic based on silicon oxycarbide (SiOC): A promising approach to obtain a new electrochemical sensing platform

“…7 [48]. This interplanar spacing was observed just in small regions of the sample which can be either SiC crystals or nanowires, however it was not possible to make sure about both shapes after an exhaustive morphological investigation.…”

“…2). These structures were characterized by interplanar spacing of 0.36 nm and attributed to graphite carbon [48]. The majority of structures revealed a concentric morphology, suggesting the formation of multiwall carbon nanotubes (MWCNT).…”