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Al$_2$O$_3$ nanoparticle polymorphs: effects of Zn$^{2+}$ doping on the structural, optical and cytotoxic properties
JESSICA DE LARA ANDRADE ANGELICA GONCALVES DE OLIVEIRA LEONARDO SOBREIRA RODRIGUES MYCHELLE VIANNA PEREIRA COMPANHONI CELSO VATARU NAKAMURA SANDRO MARCIO LIMA LUIS HUMBERTO DA CUNHA ANDRADE LUIZ FERNANDO COTICA ANA ADELINA WINKLER HECHENLEITNER EDGARDO ALFONSO GOMEZ PINEDA DANIELA MARTINS FERNANDES DE OLIVEIRA
Volume 44 Published: 5 February 2021 Article ID 0023
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https://www.ias.ac.in/article/fulltext/boms/044/0023 -
Keywords
Nanostructured materials ;crystal structure ;optical properties ;biomedical applications. -
Abstract
Al$_2$O$_3$-Zn $x$% NPs, with $x = 0$, 1, 3, 5 or 10 mol% Zn$^{2+}$ were synthesized by a modified sol–gel method. The influence of the insertion of Zn$^{2+}$ dopant on the crystal lattice, morphology, optical and cytotoxic properties of Al$_2$O$_3$ was investigated. Rietveld refinement applied to DRX data revealed that the oxides are constituted by four crystalline phases:$\alpha$-Al$_2$O$_3$, $\theta$-Al$_2$O$_3$, $\delta$-Al$_2$O$_3$ and $\alpha$-Al$_2$O$_3$(*), and that the doping promoted changes in unit cell volume for all the crystalline phases. Raman signals indicated that the insertion of Zn$^{2+}$ caused changes in the vibrations of bonds Al–O, mainly in tetrahedral sites of transition phases of Al$_2$O$_3$, which are preferentially occupied by Zn ions. The oxides exhibited photoluminescence emission in the visible and near-infrared region, but Al$_2$O$_3$-Zn 10% showed increasedemission intensity in the visible region. The nanoparticles with spherical and elongated morphologies did not exhibit cytotoxic effects on L929 fibroblast cells.
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Author Affiliations
JESSICA DE LARA ANDRADE1 ANGELICA GONCALVES DE OLIVEIRA1 LEONARDO SOBREIRA RODRIGUES2 MYCHELLE VIANNA PEREIRA COMPANHONI3 CELSO VATARU NAKAMURA3 SANDRO MARCIO LIMA4 LUIS HUMBERTO DA CUNHA ANDRADE4 LUIZ FERNANDO COTICA5 ANA ADELINA WINKLER HECHENLEITNER1 EDGARDO ALFONSO GOMEZ PINEDA1 DANIELA MARTINS FERNANDES DE OLIVEIRA1
- Programa de Pos-Graduac¸a˜o em Quı´mica, State University of Maringa´, Maringa 87020-900, Brazil
- Programa de Pos-Graduac¸a˜o em Materiais, Federal University of Alagoas, Maceio 57072-970, Brazil
- Departamento de Ciencias Ba´sicas da Sau´de, State University of Maringa´, Maringa 87020-900, Brazil
- Programa de Pos-Graduacaoem Recursos Naturais, State University of Mato Grosso do Sul, Dourados 79804-970, Brazil
- Programa de Po´s-Graduacao em Fısica, State University of Maringa, Maringa 87020-900, Brazil
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Dates
- Published
- 5 February 2021
- Manuscript received
- 16 May 2019
- Accepted
- 28 August 2020
- Final version published online
- 5 February 2021
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Supplementary Material
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Bulletin of Materials Science
Volume 46, 2023
All articles
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Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
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