Controlled morphology and crystalline phase of poly(ethylene oxide)-TiO2 nanohybrids

Yun Mo Sung, Jin Kyung Lee

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Poly(ethylene oxide) (PEO)-titania (TiO2) organic-inorganic hybrid powder having different microstructures was synthesized through a sol-gel process and crystallized by subsequent heat treatments at elevated temperatures. As-precipitated hybrid powder showed two distinct morphologies, one of which is spherical and the other is platelike depending upon aging time. It is presumed that the structural variation was highly related with the formation of hydrogen bonds between a chelating agent (2,4-pentanedione: AcAc) and a polymer component (poly(ethylene oxide): PEO). Also, microspherical particles with nanocrystalline anatase core/rutile shell structure were prepared through heat treatment at 800°C. The mechanism of core/shell structure formation was elucidated by the shrinkage during anatase-to-rutile phase transformation, the difference in thermal expansion coefficient (TEC) of two crystals, and further decomposition of remaining organic components trapped in the core. In addition, the powder with platelike structure showed retardation in anatase-rutile phase transformation kinetics compared to that with spherical structure.

Original languageEnglish
Pages (from-to)737-742
Number of pages6
JournalCrystal Growth and Design
Volume4
Issue number4
DOIs
Publication statusPublished - 2004 Jul 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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