Sol–gel synthesis of Si3N4 nanowires and nanotubes

Silicon nitride nanowires and nanotubes were synthesised from a binary sol-gel route, in which tetraethoxysilane and phenolic resin were used to prepare a carbonaceous silica xerogel and ferric nitrate was used as additive. Raw Si3N4 product was obtained by heating the xerogel at 1300 C for 10 h in...

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Published inMaterials letters Vol. 60; no. 3; pp. 330 - 333
Main Authors Wang, Feng, Jin, Guo-Qiang, Guo, Xiang-Yun
Format Journal Article
LanguageEnglish
Published 01.02.2006
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Summary:Silicon nitride nanowires and nanotubes were synthesised from a binary sol-gel route, in which tetraethoxysilane and phenolic resin were used to prepare a carbonaceous silica xerogel and ferric nitrate was used as additive. Raw Si3N4 product was obtained by heating the xerogel at 1300 C for 10 h in nitrogen flow (200 ml/min). The Si3N4 sample after purification was characterised by XRD, SEM, TEM, EDX spectroscopy and selected area electron diffraction. The results showed that the sample mainly consisted of alpha-Si3N4 nanowires with a few nanotubes. Both the nanowires and nanotubes had a diameter of 30-100 nm and a length of hundreds of micron. Liquid droplets were also found at the tip of the nanowires, which indicated that the growth of the nanowires and nanotubes followed the vapour-liquid-solid (VLS) mechanism. 21 refs.
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ISSN:0167-577X
DOI:10.1016/j.matlet.2005.08.042