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A Novel Method For Fabricating Cr-Doped Alpha-Al2O3 Nanoparticles: Green Approach To Nanotechnology

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Abstract

The aim of this work was to produce Cr-doped alpha-alumina nanoparticles using a modified sol–gel method that employs the complexation capacity of natural organic matter (NOM). For this synthesis, the initial pH of the sol was adjusted to 4.0, and final calcination of the xerogel was performed at 1100 °C for 4 h. XRD and FTIR analyses confirmed that the hexagonal α-Al2O3 phase was produced under these conditions. Chromaticity analyses revealed that more intense pink colors were obtained for the samples with higher Cr concentrations. XANES measurements showed that the oxidation state of chromium in the alumina matrix was strongly dependent on the dopant concentration and that it was possible to produce samples free from Cr(VI). The photo- and radioluminescence spectra of the nanoparticles were found to be sensitive to the dopant concentration. All these findings demonstrated that the synthesis procedure using NOM could provide considerable environmental, technological, and economic benefits.

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Acknowledgements

The authors wish to thank CMNano-UFS for access to microscopy facilities, LNLS, and the Brazilian funding agencies CNPq, FAPITEC/SE, and CAPES for financial support.

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Authors and Affiliations

  1. Chemistry Department, Federal University of Sergipe (UFS), Aracaju, Sergipe, 49100-000, Brazil

    Graziele C. da Cunha & Luciane P. C. Romão

  2. Materials Science and Engineering Department, Federal University of Sergipe (UFS), Aracaju, Sergipe, 49100-000, Brazil

    Carolina M. Abreu, Janaina A. Peixoto & Zélia S. Macedo

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  1. Graziele C. da Cunha
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  2. Carolina M. Abreu
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  3. Janaina A. Peixoto
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  4. Luciane P. C. Romão
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  5. Zélia S. Macedo
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Correspondence to Graziele C. da Cunha.

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da Cunha, G.C., Abreu, C.M., Peixoto, J.A. et al. A Novel Method For Fabricating Cr-Doped Alpha-Al2O3 Nanoparticles: Green Approach To Nanotechnology. J Inorg Organomet Polym 27, 674–684 (2017). https://doi.org/10.1007/s10904-017-0510-3

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  • DOI: https://doi.org/10.1007/s10904-017-0510-3

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