Preparation, characterization, and photocatalytic properties of CaNb 2O6 nanoparticles

In Sun Cho, Shin Tae Bae, Dong Kyun Yim, Dong Wan Kim, Kug Sun Hong

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

CaNb2O6 nanoparticles with a size range of 30-50 nm were synthesized by heat treatment at 600°C after a solvothermal process and their optical and photocatalytic properties were investigated. The prepared powders were characterized by X-ray powder diffractometer, field-emission scanning electron microscope, transmission electron microscope, UV-Vis diffuse reflectance spectroscopy, Fluorescence spectroscopy, and Raman spectroscopy. Compared with a powder of the same material prepared by a solid-state reaction (SS) method, the nanoparticles exhibited a higher Brunauer-Emmett-Teller (BET) surface area, more efficient light absorption, and enhanced photocatalytic activity for producing H2 from pure water under UV irradiation. The photoluminescence spectra revealed that a radiative recombination process is dominant in the powder prepared by the SS method (strong blue emission at 300 K) under UV light irradiation, while no obvious emission was observed in the nanoparticles. This decrease of the radiative recombination as well as the higher optical absorption ability and higher BET surface area resulting from the reduced dimensionality led to enhanced photocatalytic activity of the nanoparticles.

Original languageEnglish
Pages (from-to)506-510
Number of pages5
JournalJournal of the American Ceramic Society
Volume92
Issue number2
DOIs
Publication statusPublished - 2009 Feb
Externally publishedYes

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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