Al2O3 colloidal nanocrystals with strong UV emission

Mohammad Reza Gaeeni, Morteza Sasani Ghamsari, Abbas Majd Abadi, Mohammad Hossein Majles Ara, Wooje Han, Hyung-Ho Park

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Abstract

A facile sol-gel procedure has been developed for the synthesis of colloidal alumina nanocrystals. For the first time, optical characterization procedures were employed to study the quantum confinement effects in optical properties of the prepared Al2O3 sol. Accordingly, the hyperbolic band model was used to determine the optical band gap of colloidal alumina nanocrystals. X-Ray diffraction pattern was used to study the crystallographic phase of the dried gel. Morphological characterization was performed using scanning electron microscopy (SEM). Inductively Coupled Plasma (ICP) emission spectroscopy was used to determination purity of the Al2O3 powder. High-resolution TEM showed that the diameter of colloidal nanocrystals is about 10 nm. Photoluminescence spectroscopy demonstrated that quantum yields for colloidal nanocrystals are 68% with 300 nm excitation wavelength. The experimental observations confirm that highly stable alumina sol with strong UV emission was synthesized. The mentioned optical properties have not been reported before.

Original languageEnglish
Pages (from-to)1818-1822
Number of pages5
JournalJournal of the American Ceramic Society
Volume98
Issue number6
DOIs
Publication statusPublished - 2015 Jun 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

Gaeeni, M. R., Ghamsari, M. S., Majd Abadi, A., Majles Ara, M. H., Han, W., & Park, H-H. (2015). Al2O3 colloidal nanocrystals with strong UV emission. Journal of the American Ceramic Society, 98(6), 1818-1822. https://doi.org/10.1111/jace.13546