介孔二氧化硅-碳纳米复合材料大规模合成α-Si3N4纳米纤维和纳米带

IF 0.5 4区 材料科学 Q4 MATERIALS SCIENCE, CERAMICS Journal of Ceramic Science and Technology Pub Date : 2017-06-01 DOI:10.4416/JCST2016-00118
Kun Wang, H. Wang, Y-B. Cheng
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引用次数: 1

摘要

这项工作提出了一种低成本、大规模的氮化硅纳米纤维和纳米带合成技术,该技术基于使用介孔二氧化硅-碳纳米复合材料作为前体,通过碳热还原和氮化反应。通过在具有不同流速的流动氮气中对具有不同C/SiO2比率的前体进行热处理,研究了生长机制。在从下面未反应的粉末中容易分离后,获得了高度结晶的氮化硅纳米纤维和纳米带。较高的C/SiO2比率提供更好的氮化物产物产率。带的厚度可以保持恒定,而带的宽度可以通过调节氮气的流速来控制。Si3N4纳米带的生长方向平行于a-Si3N4的[100]晶体取向。
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Large-scale synthesis of α-Si3N4 nanofibers and nanobelts from mesoporous silica-carbon nanocomposites
This work presents a low-cost and large-scale synthesis technique for silicon nitride nanofibers and nanobelts based on the use of mesoporous silica-carbon nanocomposites as precursors via a carbothermal reduction and nitridation reaction. The growth mechanisms have been investigated by carrying out heat-treatment of precursors with different C/SiO2 ratios in a flowing nitrogen gas with different flow rates. Highly crystalline silicon nitride nanofibers and nanobelts were obtained after easy separation from the unreacted powder underneath. A higher C/SiO2 ratio gives a better yield of nitride products. The thickness of the ribbons can be maintained as constant while the width of the ribbons can be controlled by tailoring the flow rate of nitrogen gas. The growth direction of Si3N4 nanobelts is parallel to the [100] crystallographic orientation of a-Si3N4.
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来源期刊
Journal of Ceramic Science and Technology
Journal of Ceramic Science and Technology MATERIALS SCIENCE, CERAMICS-
CiteScore
0.80
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期刊介绍: The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.
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