| Autor: |
Ott A; Technische Universität Darmstadt, Institut für Materialwissenschaft, Otto-Berndt-Str. 3, D-64287 Darmstadt, Germany. gabriela.mera@tu-darmstadt.de., Rogg S, Lauterbach S, Kleebe HJ, Hess C, Mera G |
| Jazyk: |
angličtina |
| Zdroj: |
Dalton transactions (Cambridge, England : 2003) [Dalton Trans] 2020 Jun 07; Vol. 49 (21), pp. 7144-7154. Date of Electronic Publication: 2020 May 15. |
| DOI: |
10.1039/d0dt01016b |
| Abstrakt: |
Herein we report the synthesis of novel 0D-nanocarbon-based silicon-containing ceramic composites by a facile salt-free synthesis method followed by polymer-to-ceramic transformation. 0D-nanocarbon-silica composites were synthesized via a one-pot sol-gel process using tetramethyl orthosilicate (TMOS) and functionalized nanodiamonds and converted subsequently via pyrolysis under an argon atmosphere into nanodiamond/silica nanocomposites. The thermal conversion of the nanodiamond phase to a multilayer fullerene phase was carefully investigated by integral and local characterization methods such as vibrational spectroscopy, X-ray diffraction, BET, SEM and HRTEM. The incorporation of nanodiamonds in a silica matrix enhances the crystallization temperature of the silica phase, as α-cristobalite, to 1500 °C, while their full graphitization is shifted to T > 1700 °C under an argon atmosphere. The thermal decomposition of the nanodiamond/silica composites leads to the formation of materials with a high specific surface area (up to 562 m 2 g -1 ) and a mesoporous structure. No carbothermal reaction of composing phases was identified. The results obtained in the present study allow for designing advanced and highly-defined mesoporous 0D-nanocarbon-containing composites with tailored structural features and multifunctional property profiles. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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