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

da Cunha, Graziele C. ; Abreu, Carolina M. ; Peixoto, Janaina A. ; Romão, Luciane P. C. ; Macedo, Zélia S.

Journal of inorganic and organometallic polymers and materials, 2017-05, Vol.27 (3), p.674-684 [Periódico revisado por pares]

New York: Springer US

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  • Título:
    A Novel Method For Fabricating Cr-Doped Alpha-Al2O3 Nanoparticles: Green Approach To Nanotechnology
  • Autor: da Cunha, Graziele C. ; Abreu, Carolina M. ; Peixoto, Janaina A. ; Romão, Luciane P. C. ; Macedo, Zélia S.
  • Assuntos: Chemistry ; Chemistry and Materials Science ; Inorganic Chemistry ; Nanoparticles ; Organic Chemistry ; Polymer Sciences
  • É parte de: Journal of inorganic and organometallic polymers and materials, 2017-05, Vol.27 (3), p.674-684
  • Descrição: 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-Al 2 O 3 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.
  • Editor: New York: Springer US
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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