Characterization of polymer-derived ceramers subjected to wet-etching and the evolution of the carbon phase during thermal conversion
| Autor: | M. Teresa Colomer, Carmen Arroyo, Fausto Rubio, Aitana Tamayo, MaAngeles Rodriguez |
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| Přispěvatelé: | Fundación General CSIC, Ministerio de Economía y Competitividad (España) |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Carbon Nananostructures chemistry.chemical_element 02 engineering and technology 01 natural sciences Carbide Etching (microfabrication) Phase (matter) 0103 physical sciences Materials Chemistry Ceramic 010302 applied physics chemistry.chemical_classification Polymer Cobalt 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry Chemical engineering Etching Polymer Derived Ceramics visual_art Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology Pyrolysis Carbon |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | [Èn] The present work is focused on revealing the structural, textural and electrochemical characteristics of the carbon phases developed during the pyrolysis of commercial preceramic precursors in the presence of cobalt. At intermediate pyrolysis temperature, Cobalt is capable of forming labile carbides into the preceramic polymer network that, upon decomposition, lead to the formation of ordered carbonaceous structures during the thermal conversion. Etching with HF removes the undesirable SiO-like phase allowing, for the first time, to detect the presence of Co-carbon nano-onions (Co@CNO) in silicon oxycarbide ceramers. These ordered Co@CNO were formed at pyrolysis temperatures ranged between 700 and 800 °C but a further increase of the temperature induces a significant disorder into the carbon phase and incorporation of the C in the ceramic structure, as deduced from the spectroscopic characterization of these materials. A. Tamayo acknowledges the financial support from Fundacion General CSIC and the COMFUTURO program. This work was developed under the frame of the project MAT2016-78700-R |
| Databáze: | OpenAIRE |
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