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Solvent-free catalytic synthesis and optical properties of super-hard phase ultrafine carbon nitride nanowires with abundant surface active sites
- Wang, Jilin, Zhang, Lulu, Long, Fei, Wang, Weimin, Gu, Yunle, Mo, Shuyi, Zou, Zhengguang, Fu, Zhengyi
- RSC advances 2016 v.6 no.28 pp. 23272-23278
- Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, active sites, ammonium chloride, carbon nitride, catalytic activity, crystal structure, energy-dispersive X-ray analysis, ferric oxide, growth models, melting, nanowires, photoluminescence, poly(vinyl chloride), raw materials, reaction mechanisms, reflectance, reflectance spectroscopy, surface area, transmission electron microscopy
- High-quality ultrafine α/β-carbon nitride (α/β-C₃N₄) nanowires have been fabricated through a novel hot melt reduction synthetic method using polyvinylchloride ([–C₂H₃Cl–]ₙ), ammonium chloride (NH₄Cl) and ferric oxide (Fe₂O₃) as raw materials. The purity, structure, morphology, crystallinity and surface state of the as-prepared samples were investigated by FSEM, TEM, HRTEM, SAED, XRD, EDX, FTIR and XPS. The nanowires presented good crystallinity with a length range of 1–4 μm and an average diameter of about 10 nm. Every nanowire possessed a high specific surface area and rough surface with abundant exposed atoms/prominences, indicating that the surface structure will facilitate further surface modification, functionalization and related applications. In addition, UV-vis diffuse reflectance and the corresponding photoluminescence (PL) spectra indicated that the nanowires have a wide band gap (4.38 eV) and obvious ultraviolet luminescence properties at the maximum emission peak of about 340 nm. A catalytic reaction mechanism and the growth model were also proposed to explain the formation process of the C₃N₄ nanowires.