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    Home > Preparation of new carbon nanomaterials: SP3 hybrid bonded carbon nitride nanowires

    Preparation of new carbon nanomaterials: SP3 hybrid bonded carbon nitride nanowires

    • Last Update: 2018-04-11
    • Source: Internet
    • Author: User
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    Carbon is the most abundant material of allotrope In addition to three-dimensional carbon materials such as graphite and diamond, it mainly includes two-dimensional carbon materials such as graphene and graphene, one-dimensional carbon materials such as carbon nanotubes and zero dimensional materials such as fullerene Among them, one-dimensional carbon nano materials are nano materials with radial size and micro axial size Since its discovery, this material based on C-C bond has attracted extensive attention of scholars due to its excellent chemical, photophysical, electromagnetic and mechanical properties, and has been widely used in energy storage materials, electronic devices, sensors and catalysis However, at present, one-dimensional carbon nanomaterials are mainly carbon nanotubes and carbon nanofibers Most of the carbon atoms in them are bonded by SP 2 hybrid orbit, while one-dimensional carbon nanomaterials bonded by SP 3 hybrid orbit are relatively rare However, one-dimensional carbon nanomaterials based on SP 3 hybrid orbital bonding have very high Young's modulus, and their strength is not inferior to that of common carbon nanotubes In addition, the fibers and polymers based on this material show unique properties, so it has gradually become the focus of scholars Recently, Professor John v badding of the school of chemistry of Pennsylvania State University has prepared ordered carbon nitride nanowires with SP 3 hybrid orbital bonding using pyridine as raw material Solid pyridine has a different crystal structure from benzene, so the properties of the low-dimensional crystals prepared by compressing small-size aromatic compounds are also different In addition, the nitrogen atoms in the carbon nitride nanowires can improve the processability of the material, change its photoluminescence, and even reduce the energy band gap This achievement was published under the title of "carbon nitride nanothread crystals derived from pyredine" and the Journal of the American Chemical Society (DOI: 10.1021 / JACS 7b13247) Figure 1 Carbon nitride nanowire material based on pyridine (photo source: J am Chem SOC 2018, ASAP) In order to obtain carbon nitride nanowire, the author first slowly pressurizes the liquid pyridine, and finds that pyridine will become solid under the pressure of 1-2 GPA, while the reaction will occur at about 18 GPa However, the crystal products obtained only by compressing pyridine do not have the diffraction pattern of nanowires Therefore, the author continued to compress the product at 23 GPa for 1 hour and then slowly reduced the pressure Finally, the translucent yellow solid was obtained Compared with the thin films prepared by CVD, the carbon nitride nanowires show a higher degree of order in axial stacking and atomic structure At the same time, the solid-state nuclear magnetic carbon spectrum and nitrogen spectrum show that the hybrid mode of carbon atoms in the nanowires prepared by this method is really SP 3 Figure 2 Infrared (left) and nuclear magnetic (right) spectra of nanowire materials (photo source: J am Chem SOC 2018, ASAP) In addition, as mentioned above, nanowires usually have photoluminescence properties However, compared with pure carbon nanowires, nitrogen doped carbon nanowires exhibit different blue, green and red emission properties After doping with nitrogen, the emission wavelength of carbon nanowires shows a certain red shift, which may be related to the decrease of band gap of carbon nanowires, and the change of optical properties can be used for specific biological imaging Figure 3 Photoluminescence properties of nanowire materials (photo source: J am Chem SOC 2018, ASAP) Full text author: Xiang Li, Tao Wang, Pu Duan, mariabaldini, haw tyng Huang, Bo Chen, Stephen j.juhl, Daniel koeplinger, Vincent H Crespi, klausschmidt Rohr, Roald Hoffmann, Nasim Alem, malcolmguthrie, Xin Zhang, And John v badding, corresponding author: John v badding
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