Synthesis of hollow and aggregated CeO 2 :Sm 3+ microspheres and their redox-responsive luminescence

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Abstract

Hollow and aggregated microspheres of an Sm 3+ -doped CeO 2 phosphor material were synthesized by liquid processes using organic materials as a template and a structure-directing agent, respectively The microstructure of both the microspheres obtained were characterized as their crystallite size and specific surface area because they were comprised of CeO 2 :Sm 3+ nanocrystals approximately 20 nm in size. The microspheres showed orange luminescence due to electronic transitions of the Sm 3+ ions upon excitation with ultraviolet light. The luminescence intensity was decreased when the microspheres were treated with an aqueous L(+)-ascorbic acid solution as a reductant. The intensity was then recovered by treating the microspheres with an H 2 O 2 solution as an oxidant. Such the redox-responsive luminescence switching is promising for sensing applications if the sensitivity can be controlled well. The relationship between the structural features of the microspheres and the luminescence switching property was then examined in detail.

Original languageEnglish
Pages (from-to)1074-1081
Number of pages8
JournalJournal of Alloys and Compounds
Volume787
DOIs
Publication statusPublished - 2019 May 30

Keywords

  • Chemical synthesis
  • Luminescence
  • Microstructure
  • Nanostructured materials
  • Optical materials
  • Optical properties

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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