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Issue 9, 2009
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Hydrothermal synthesis and characterization of KNbO3nanorods

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Abstract

Single-crystalline KNbO3nanorods were prepared from Nb2O5 by hydrothermal synthesis at 180 °C in a KOH solution using sodium dodecyl sulfate surfactant. The morphology of the KNbO3 product was strongly influenced by the addition of the surfactant, the concentration of the reactants, the reaction time and temperature, demonstrating that KN nanorods were only obtained in a narrow window of synthesis parameters. At the optimized conditions the orthorhombic KNbO3nanorods were 100–300 nm in diameter, up to 5 µm in length and grew along the [001] direction. The proposed growth mechanism is based on self-assembly of cube-shaped or facetted KNbO3nanocrystals into mesocrystals, which further ripen into nanorods. High temperature X-ray diffraction, calorimetry and Raman spectroscopy evidenced that the orthorhombic to tetragonal and tetragonal to cubic phase transition of KNbO3nanorods occurred at significantly lower temperatures than for bulk KNbO3, reflecting finite size or disorder effects.

Graphical abstract: Hydrothermal synthesis and characterization of KNbO3nanorods

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Publication details

The article was received on 14 Apr 2009, accepted on 11 Jun 2009 and first published on 01 Jul 2009


Article type: Paper
DOI: 10.1039/B907561P
Citation: CrystEngComm, 2009,11, 1958-1963
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    Hydrothermal synthesis and characterization of KNbO3nanorods

    G. Wang, S. M. Selbach, Y. Yu, X. Zhang, T. Grande and M. Einarsrud, CrystEngComm, 2009, 11, 1958
    DOI: 10.1039/B907561P

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