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  Journal of Nanoscience Letters 2014, 4: 6
  Research Article
Fabrication of Bi2Fe4O9 nanotubes decorated with iron-rich nanorings by Rayleigh instability induced sol-gel synthesis in porous anodic alumina
  Lifeng Liua, Xingsen Gaob  
a International Iberian Nanotechnology Laboratory (INL), 4715-330 Braga, Portugal
b Institute for Advanced Materials, South China Normal University, 510006 Guangzhou, China

  A unique complex nanostructure, Bi2Fe4O9 nanotube decorated with iron-rich nanorings along the tube axis, has been fabricated by sol-gel synthesis in porous anodic alumina membranes and characterized in detail by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). Rayleigh instability of the precursor sol upon thermal annealing is proposed to be responsible for the formation of this unique complex nanostructure. The as-fabricated Bi2Fe4O9 nanotube arrays exhibit a room temperature ferroelectric behavior, which may find potential applications in the next generation ferroelectric devices.
  Template sol-gel synthesis; Bi2Fe4O9 nanotubes; Rayleigh instability; Microstructure  

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