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Pr6O11 micro-spherical nano-assemblies: microwave-assisted synthesis, characterization and optical properties

Majeed, Shafquat and Shivashankar, SA (2013) Pr6O11 micro-spherical nano-assemblies: microwave-assisted synthesis, characterization and optical properties. In: Materials Chemistry and Physics, 143 (1). pp. 155-160.

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Official URL: http://dx.doi.org/10.1016/j.matchemphys.2013.08.04...


We report the synthesis of Pr6O11 microspheres self-assembled from ultra-small nanocrystals formed by the microwave irradiation of a solution of a salt of Pr in ethylene glycol (EG). The as-prepared product consists of microspheres measuring 200 to 500 nm in diameter and made of <5 nm nano-crystallites. The surface of these microspheres/nanocrystals is covered/capped with an organic layer of ethylene glycol as shown by TEM analysis and confirmed by IR spectroscopy measurements. The as-prepared product shows blue-green emission under excitation, which changes to orange-red when the product is annealed in air at 600 degrees C for 2 h. This change in luminescence behaviour can be attributed to presence of ethylene glycol layer in the as-prepared product. The samples were characterized by X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM), IR Spectroscopy (IR), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). (C) 2013 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Publication: Materials Chemistry and Physics
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Chemical Synthesis; Nanostructures; Oxides; Luminescence
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 10 Jan 2014 08:29
Last Modified: 10 Jan 2014 08:29
URI: http://eprints.iisc.ac.in/id/eprint/48096

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