Article

Synthesis and Characterization of Srilankite Nanowires

Department of Chemistry, Saint Louis University, St. Louis, MO 63103, USA.
Journal of Nanoscience and Nanotechnology (Impact Factor: 1.15). 02/2008; 8(3):1481-1488. DOI: 10.1166/jnn.2008.193

ABSTRACT We describe the synthesis and characterization of srilankite (Ti2ZrO6) nanowires. The nanowires are produced via hydrothermal synthesis with a TiO2/ZrO2 mixture under alkaline conditions. The zirconium titanate nanowires have median diameters of 60 nm and median lengths of 800 nm with the 〈022〉 axis along the length of the nanowire. Electron microscopy, energy dispersive X-ray spectroscopy, powder X-ray diffraction, and electron diffraction are used to characterize the phases and compare nanowires produced with varying molar ratios of Ti and Zr. Electron diffraction patterns produced from single nanowires show highly crystalline nanowires displaying a compositional-ordering superlattice structure with Zr concentrated in bands within the crystal structure. This is in contrast to naturally occurring bulk srilankite where Zr and Ti are randomly substituted within the crystal lattice. Streaking is observed in the electron diffraction patterns suggesting short-range ordering within the superlattice structure.

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    ABSTRACT: In this work is reported the synthesis of nanotubes and nanoribbons from mixed oxides (Ti1−x Zr x O2·nH2O), employing hydrothermal treatment in a highly alkaline medium. The morphology and crystal structure of the products obtained via hydrothermal treatment depend on the value of x. For example, for x equal to 0 and 0.50 were observed the presence of nanotubes (diameter around 9nm) and nanoribbons (diameter around 200nm), respectively. However, for x values above 0.50, there was no morphological change. Regarding the crystalline structure of these samples, for x equal to 0 was observed the sodium titanate phase; already for x values up to 0.50, we observed the presence of two crystalline phases: sodium titanate and tetragonal ZrO2. For x values above 0.50, only tetragonal ZrO2 was observed. Furthermore, only the product obtained from x equal to 0.15 was observed the presence of three-dimensional flower-like arrangements. The results obtained by the characterization techniques showed the segregation of zirconium after hydrothermal treatment of precursors with x less or equal to 0.50. Thus, we describe the important role that Ti/Zr molar ratio of the precursor plays on the morphology and crystalline phase of the products formed by hydrothermal treatment. KeywordsHydrothermal treatment-Mixed oxide-Nanotubes-Nanoribbons-Synthesis
    Journal of Nanoparticle Research 01/2010; 12(7):2355-2361. · 2.18 Impact Factor

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