Synthesis of Novel Nanostructures by Metal−Polytetrafluoroethene Thermolysis
Novel ceramic and carbon nanostructures have been created by thermolysis of mixtures containing polytetrafluoroethene (PTFE) and a pure metal or metal alloy in a calorimetric bomb. The influence of the stoichiometry was studied for Si-containing reactants for which the yield of the nanofibers was th...
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| Published in: | The journal of physical chemistry. B Vol. 107; no. 11; pp. 2519 - 2524 |
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| Main Authors: | , , , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
American Chemical Society
20-03-2003
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| Online Access: | Get full text |
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| Summary: | Novel ceramic and carbon nanostructures have been created by thermolysis of mixtures containing polytetrafluoroethene (PTFE) and a pure metal or metal alloy in a calorimetric bomb. The influence of the stoichiometry was studied for Si-containing reactants for which the yield of the nanofibers was the highest. The process was monitored by measuring the heat of reaction and by differential thermal analysis/thermogravimetric techniques. The reaction temperatures were measured, and the heating rates of the reactants during thermal wave propagation were estimated. Elemental analysis, X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, and energy dispersive X-ray spectrometry were employed to characterize the chemical composition and structural features of the products. Well-crystallized elongated single-crystal Si nanofibers, coated with a thin SiO2 amorphous layer, and crystallized carbon nanoparticles containing metals (e.g., Fe) and Si dominate. The highest yields of nanofibers and carbon particles were obtained from PTFE and Si-containing precursors, due to the volatility of SiF4. |
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| Bibliography: | istex:1C118E4A515D1A92044E4840A16755BC1B8D6CEF ark:/67375/TPS-50D2ZWRF-B |
| ISSN: | 1520-6106 1520-5207 |
| DOI: | 10.1021/jp022183c |