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标题：Fe(NO₃)₃-assisted large-scale synthesis of Si₃N₄ nanobelts from quartz and graphite by carbothermal reduction–nitridation and their photoluminescence properties
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作者：Shuyue Liu ; Minghao Fang ; Zhaohui Huang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep08998
出版社：Springer Nature
摘要：The large-scale synthesis of Si₃N₄ nanobelts from quartz and graphite on a graphite-felt substrate was successfully achieved by catalyst-assisted carbothermal reduction–nitridation. The phase composition, morphology, and microstructure of Si₃N₄ nanobelts were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, energy-dispersive spectroscopy, transmission electron microscopy, and high-resolution transmission electron microscopy. The Si₃N₄ nanobelts were ~4–5 mm long and ~60 nm thick and exhibited smooth surfaces and flexible shapes. The Si₃N₄ nanobelts were well crystallized and grow along the [101] direction. The growth is dominated by the combined mechanisms of vapor–liquid–solid base growth and vapor–solid tip growth. The Fe(NO₃)₃ played a crucial role in promoting the nanobelt formation in the initial stage. The room-temperature photoluminescence spectrum of Si₃N₄ nanobelts consists of three emission peaks centered at 413, 437, and 462 nm, indicating potential applications in optoelectronic nanodevices.