Synthesis of silicon carbide nanoparticles from amorphous carbon: Based on the domain structure of electrically calcined anthracite |
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| Affiliation: | 1. State Key Laboratory of Synthetical Automation for Process Industries, College of Information Science and Engineering, Northeastern University, Shenyang, 110819, China;2. Zhongtian Technology Advanced Materials Co.,Ltd, Nantong, 226009, China;3. Hebei Key Laboratory of Micro-Nano Precision Optical Sensing and Measurement Technology, Qinhuangdao, 066004, China;1. Materials Science Lab. (1), Physics Department, Faculty of Science, Cairo University, Giza, Egypt;2. Department of Physics, College of Sciences and Humanities, Shaqra University, Al Quwayiyah, 19257, Saudi Arabia;3. Department of Physics, Faculty of Applied Science, Umm AlQura University, AlZahir Branch, Makkah, 24383, Saudi Arabia;1. Key Laboratory of Materials for High Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China;2. University of Chinese Academy of Sciences, Beijing, 100049, China;3. Center for Excellence in Ultra-intense Laser Science, Chinese Academy of Sciences, Shanghai, 201800, China;4. Shanghai Academy of Spaceflight Technology, Shanghai, 201109, China;1. Anhui Engineering Research Center for High Efficiency Intelligent Photovoltaic Module, Chaohu University, Hefei, 238000, China;2. College of Mechanical Engineering, Chaohu University, Hefei, 238000, China;1. Key Laboratory of Optoelectronic Technology & Systems, Education Ministry of China, Chongqing University and College of Optoelectronic Engineering, Chongqing University, Chongqing, 400044, China;2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology and School of Electrical Engineering, Chongqing University, Chongqing, 400044, China;3. College of Chemistry and Materials Science, Hebei Normal University, Hebei, Shijiazhuang, 050024, China;1. Xi''an Key Laboratory of Textile Chemical Engineering Auxiliaries, School of Environmental and Chemical Engineering, Xi''an Polytechnic University, Xi''an, 710000, PR China;2. School of Physics and Information Technology, Shaanxi Normal University, Xi’an 710062, PR China;3. College of Physics and Electronic Information Engineering, Zhejiang Normal University, Jinhua, 321004, China;4. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China |
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| Abstract: | Based on the domain theory, the domain structure of electrically calcined anthracite was studied for the first time. The carbon microstructure of the electrically calcined anthracite was analyzed using atomic force microscopy (AFM). The analysis revealed that the carbon microstructure comprised microdomains with particle sizes below 30 nm and domains with particle sizes below 200 nm. In addition, non-graphitizable carbon structures formed by partial microdomain and domain structures were difficult to grow. Thus, we successfully synthesized novel β-type silicon carbide (β-SiC) nanoparticles with larger particle sizes below 200 nm and smaller particle sizes below 60 nm using a non-graphitizable carbon composed of carbon nanoparticles as the main raw material. Through calculation and analysis, the synthesis mechanism revealed that due to the presence of highly reactive interfacial regions between the domains of electrically calcined anthracite, silicon first diffused to the highly reactive interface between the domains of electrically calcined anthracite and reacted with the highly active carbon atoms in it to form silicon carbide, resulting in a certain degree of volume expansion. The volume expansion led to the cracking and dispersion of the domains, which further led to mutual diffusion and reaction within the exfoliated domains to generate SiC nanoparticles. And the non-exfoliated SiC nanoparticles generated at the reaction interface on the surface of electrically calcined anthracite were observed by the AFM. |
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| Keywords: | Carbon nanoparticles Domain structure Diffusion coefficient SiC nanoparticles |
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