Incorporate boron and nitrogen into graphene to make BCN hybrid nanosheets with enhanced microwave absorbing properties |
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| Affiliation: | 1. Department of Chemistry and Biology, College of Science, National University of Defense Technology, Changsha 410073, PR China;2. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, PR China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China;3. Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology (Ministry of Industry and Information Technology), Harbin Institute of Technology, Harbin 150001, China;1. State Key Discipline Laboratory of Wide BandGap Semiconductor Technology, School of Microelectronics, Xidian University, Xi''an 710071, PR China;2. School of Physics and Optoelectronic Engineering, Xidian University, Xi''an 710071, PR China;3. College of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, PR China;4. Department of Physics and information technology, Baoji University of Arts and Science, Baoji 721016, PR China;5. School of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen 518055, PR China;1. Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China;2. School of Materials Science and Engineering, Hunan University, Changsha, 410082, China |
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| Abstract: | This work demonstrates the conversion of graphene oxide into BCN hybrid nanosheets by reaction with boric acid and urea at 900 °C, during which boron and nitrogen atoms are incorporated into the graphene atomic sheets. X-ray diffraction pattern and X-ray photoelectron spectroscopy reveal the existence of h-BN. High-resolution electron microscopy and Raman spectrum indicate the presence of graphene-like layers with h-BN nanodomains. The content of h-BN in the BCN nanosheets can also be tuned by further heat-treatment in an ammonia environment, which in turn affects the band gap of these nanosheets. The electromagnetic parameters suggest that these samples can be used as good microwave absorbing materials at G band (5.6–8.2 GHz) and X band (8.2–12.4 GHz). This study provides a simple route to BCN hybrid nanosheets with tunable band gap and adjustable conductivity for microwave absorbing applications. |
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