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CELSO VATARU NAKAMURA
Articles written in Bulletin of Materials Science
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Volume 44 All articles Published: 5 February 2021 Article ID 0023
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
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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Bulletin of Materials Science
Volume 46, 2023
All articles
Continuous Article Publishing mode
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020 -
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Posted on July 25, 2019Click here for Editorial Note on CAP Mode
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