{"title":"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","authors":"Kun Wang, H. Wang, Y-B. Cheng","doi":"10.4416/JCST2016-00118","DOIUrl":null,"url":null,"abstract":"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.","PeriodicalId":48807,"journal":{"name":"Journal of Ceramic Science and Technology","volume":null,"pages":null},"PeriodicalIF":0.5000,"publicationDate":"2017-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Large-scale synthesis of α-Si3N4 nanofibers and nanobelts from mesoporous silica-carbon nanocomposites\",\"authors\":\"Kun Wang, H. Wang, Y-B. Cheng\",\"doi\":\"10.4416/JCST2016-00118\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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.\",\"PeriodicalId\":48807,\"journal\":{\"name\":\"Journal of Ceramic Science and Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2017-06-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Ceramic Science and Technology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.4416/JCST2016-00118\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, CERAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Ceramic Science and Technology","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.4416/JCST2016-00118","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
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.
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.