Publicação: Formation of beta-nickel hydroxide plate-like structures under mild conditions and their optical properties
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Academic Press Inc. Elsevier B.V.
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Nanostructural beta-nickel hydroxide (beta-Ni(OH)(2)) plates were prepared using the microwave hydrothermal (MH) method at a low temperature and short reaction times. An ammonia solution was employed as the coordinating agent, which reacts with [Ni(H2O)(6)](2+) to control the growth of beta-Ni(OH)(2) nuclei. A trigonal beta-Ni(OH)(2) single phase was observed by X-ray diffraction (XRD) analyses, and the crystal cell was constructed with structural parameters and atomic coordinates obtained from Rietveld refinement. Field emission scanning electron microscopy (FE-SEM) images revealed that the samples consisted of hexagonal-shaped nanoplates with a different particle size distribution. Broad absorption bands assigned as transitions of Ni2+ in oxygen octahedral sites were revealed by UV-vis spectra. Photoluminescence (PL) properties observed with a maximum peak centered in the blue-green region were attributed to different defects, which were produced during the nucleation process. We present a growth process scheme of the beta-Ni(OH)(2) nanoplates. (C) 2011 Elsevier B.V. All rights reserved.
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beta-Ni(OH)(2) nanoplates, Microwave-hydrothermal, Growth mechanism, Rietveld refinement, Photoluminescence property
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Inglês
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Journal of Solid State Chemistry. San Diego: Academic Press Inc. Elsevier B.V., v. 184, n. 10, p. 2818-2823, 2011.
