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Novel 0D-nanocarbon-silica ceramic composites: sol–gel synthesis and high-temperature evolution

Ott, Alexander and Rogg, Simone and Lauterbach, Stefan and Kleebe, Hans-Joachim and Hess, Christian and Mera, Gabriela (2020):
Novel 0D-nanocarbon-silica ceramic composites: sol–gel synthesis and high-temperature evolution.
In: Dalton Transactions, 49 (21), pp. 7144-7154. Royal Society of Chemistry, ISSN 1477-9226,
DOI: 10.1039/D0DT01016B,
[Article]

Abstract

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 m2 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.

Item Type: Article
Erschienen: 2020
Creators: Ott, Alexander and Rogg, Simone and Lauterbach, Stefan and Kleebe, Hans-Joachim and Hess, Christian and Mera, Gabriela
Title: Novel 0D-nanocarbon-silica ceramic composites: sol–gel synthesis and high-temperature evolution
Language: English
Abstract:

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 m2 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.

Journal or Publication Title: Dalton Transactions
Journal volume: 49
Number: 21
Publisher: Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 04 Jun 2020 05:49
DOI: 10.1039/D0DT01016B
Official URL: https://doi.org/10.1039/D0DT01016B
Projects: German Research Foundation (DFG), Grant Number IO 83/2-1
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