Synthesis of submicrometer-sized titania spherical particles with a sol-gel method and their application to colloidal photonic crystals

Eiichi Mine, Mitsuaki Hirose, Daisuke Nagao, Yoshio Kobayashi, Mikio Konno

Research output: Contribution to journalArticle

79 Citations (Scopus)

Abstract

A synthetic method for preparing submicrometer-sized titania particles is proposed, which is based on hydrolysis of titanium alkoxide with the use of a cosolvent and an amine catalyst for alkoxide hydrolysis. The preparation was performed with different amines of ammonia, methylamine (MA), and dimethylamine (DMA) in different solvents of ethanol/acetonitrile, ethanol/methanol, ethanol/acetone, ethanol/acetonitrile, and ethanol/formamide for 0.1-0.3 M water and 0.03 M titanium tetraisopropoxide (TTIP) at temperatures of 10-50°C. The use of the ethanol/acetonitrile solvent with MA was required for preparing monodispersed, spherical particles. The number average of the titania particle sizes and their coefficient of variation were varied from 143 to 551 nm and from 5.7 to 20.6%, respectively, with reaction temperature and concentrations of water and MA. Colloidal crystals of titania particles fabricated with a sedimentation method revealed reflection peaks attributed to Bragg's diffraction. Annealing at 100-1000°C led to shrinkage and crystallization of titania particles followed by an increase in the refractive index of titania particles.

Original languageEnglish
Pages (from-to)162-168
Number of pages7
JournalJournal of Colloid And Interface Science
Volume291
Issue number1
DOIs
Publication statusPublished - 2005 Nov 1

Keywords

  • Bragg's diffraction
  • Colloidal crystal
  • Monodispersed particle
  • Sedimentation
  • Sol-gel method
  • Titania

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Surfaces, Coatings and Films
  • Colloid and Surface Chemistry

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