Synthesis of nitrogen-rich carbon-nitrogen micro-nanowires by gas phase method. Carbonitride materials have lower density, good chemical inertness and biocompatibility. Theoretical predictions also indicate that carbon-nitrogen crystals such as β-C3N4 may have a high hardness comparable to that of diamond. However, due to the high chemical stability of nitrogen, it usually overflows in the form of nitrogen at high temperatures. Therefore, in the previously reported carbon-nitrogen system materials, the nitrogen content is usually low.
The research team led by Sun Lianfeng of the National Nanoscience Center and the associate researcher of Wei Weiguo collaborated with Professor Shi Yongjun from the Institute of Physics and Professor Tian Yongjun from Yanshan University, and made important progress in the preparation of high-nitrogen carbon-nitrogen one-dimensional micro-nanostructures. They used a stepwise cracking of melamine to obtain a carbon-nitrogen material with a thermal stability higher than 700 ° C, wherein the nitrogen content is about 1.5 times the carbon content. Using this product as a raw material, mass production of carbon-nitrogen micro-nanowires was achieved by thermal evaporation CVD. By adjusting the gas phase partial pressure of carbon and nitrogen in the reaction chamber, the diameter of the carbon-nitrogen fiber/nanowire can be adjusted over a wide range (100 nm to 10 μm). The composition analysis showed that the nitrogen atom content in the product exceeded 55%. After a series of experiments, they proposed that due to the high thermal stability of the precursor, the heterocyclic benzene ring (C3N3) composed of carbon and nitrogen atoms and its derivatized structure during thermal evaporation were not destroyed, but as a basic The structural unit is deposited and grown into a one-dimensional structure at a suitable temperature and carrier gas flow to ensure high nitrogen content of the product.
The research results laid the foundation for the large-scale synthesis and application of carbon-nitrogen low-dimensional materials. The online version of this part of the results was published on April 9, 2008 in Advanced Materials.
The research was funded by the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Chinese Academy of Sciences' Hundred Talents Program.
The research team led by Sun Lianfeng of the National Nanoscience Center and the associate researcher of Wei Weiguo collaborated with Professor Shi Yongjun from the Institute of Physics and Professor Tian Yongjun from Yanshan University, and made important progress in the preparation of high-nitrogen carbon-nitrogen one-dimensional micro-nanostructures. They used a stepwise cracking of melamine to obtain a carbon-nitrogen material with a thermal stability higher than 700 ° C, wherein the nitrogen content is about 1.5 times the carbon content. Using this product as a raw material, mass production of carbon-nitrogen micro-nanowires was achieved by thermal evaporation CVD. By adjusting the gas phase partial pressure of carbon and nitrogen in the reaction chamber, the diameter of the carbon-nitrogen fiber/nanowire can be adjusted over a wide range (100 nm to 10 μm). The composition analysis showed that the nitrogen atom content in the product exceeded 55%. After a series of experiments, they proposed that due to the high thermal stability of the precursor, the heterocyclic benzene ring (C3N3) composed of carbon and nitrogen atoms and its derivatized structure during thermal evaporation were not destroyed, but as a basic The structural unit is deposited and grown into a one-dimensional structure at a suitable temperature and carrier gas flow to ensure high nitrogen content of the product.
The research results laid the foundation for the large-scale synthesis and application of carbon-nitrogen low-dimensional materials. The online version of this part of the results was published on April 9, 2008 in Advanced Materials.
The research was funded by the National Natural Science Foundation of China, the Ministry of Science and Technology, and the Chinese Academy of Sciences' Hundred Talents Program.
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