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Large scale synthesis of Si3N4@SiOx core-shell structure nanowires by direct nitridation.
- Source :
-
Ceramics International . Jul2020:Part B, Vol. 46 Issue 10, p17135-17139. 5p. - Publication Year :
- 2020
-
Abstract
- In this work, millimeter-scale Si 3 N 4 @SiO x core-shell structure nanowires were synthesized using the direct nitridation method without the use of catalysts. The silicon powders used as raw materials were pretreated at 1300 °C for 3 h under ammonia. The ammonia was then converted into a nitrogen/hydrogen gas mixture and heated at 1350 °C for another 5 h. The morphology and structure of the as-obtained nanowires were investigated in detail. The Si 3 N 4 @SiO x nanowires with a core-shell structure were composed of a crystalline α-Si 3 N 4 core and an amorphous SiO x shell. The formation of the α-Si 3 N 4 core nanowire is due to the reaction of the N 2 gas with the byproduct SiO gas. However, the formation of the amorphous SiO x shell is related to the deposition location of the samples. For the inner part of the samples, the SiO x shell derives from the deposition of the byproduct SiO gas at 1350 °C, while the SiO x shell of the external part of the samples likely derives from the oxidation of the silicon nitride core during the cooling process. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 46
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 143192402
- Full Text :
- https://doi.org/10.1016/j.ceramint.2020.03.266