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Issue 90, 2014
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Exploiting oriented attachment in stabilizing La3+-doped gallium oxide nano-spindles

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Abstract

Retaining the morphology of gallium oxide nanostructures during structural transformations or after doping with lanthanide ions is not facile. Here we report on the sonochemical synthesis of nearly monodisperse ∼550 nm long nano-spindles of undoped and La-doped α-GaOOH. The transformation of as-prepared undoped and La-doped α-GaOOH powders into the corresponding undoped and La-doped Ga2O3 phases (α and β) was achieved by carrying out controlled annealing at elevated temperatures under optimized conditions. The formation of gallium oxide nano-spindles is explained by invoking the phenomenon of oriented attachment, as amply supported by electron microscopy. Interestingly, the morphology of the gallium oxide nano-spindles remained conserved even after doping them with more than 1.4 at% of La3+ ions. Such robust structural stability could be attributed to the oriented attachment-type growth observed in the nano-spindles. The as-prepared samples and the corresponding annealed ones were thoroughly characterized by powder X-ray diffraction (PXRD), electron microscopy (SEM, TEM, and STEM-EDS) and X-ray photoelectron spectroscopy (XPS). Finally, photoluminescence from the single-crystalline undoped and La-doped β-Ga2O3 was explored.

Graphical abstract: Exploiting oriented attachment in stabilizing La3+-doped gallium oxide nano-spindles

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Publication details

The article was received on 14 Jul 2014, accepted on 23 Sep 2014 and first published on 23 Sep 2014


Article type: Paper
DOI: 10.1039/C4RA07089E
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Citation: RSC Adv., 2014,4, 49360-49366

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    Exploiting oriented attachment in stabilizing La3+-doped gallium oxide nano-spindles

    M. I. Dar, S. Sampath and S. A. Shivashankar, RSC Adv., 2014, 4, 49360
    DOI: 10.1039/C4RA07089E

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