Controlled crystallization of nanoporous and core/shell structure titania photocatalyst particles

Yun Mo Sung, Jin Kyung Lee, Won Seok Chae

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Poly(ethylene oxide) (PEO)-titania (TiO2) organic-inorganic hybrid particles were synthesized using sol-gel chemistry and crystallized at 600, 800, and 900 °C. Anatase/rutile core/shell-structured titania particles were obtained through partial phase transformation (∼70%) of anatase to rutile at 800 °C. The mechanism of core/shell structure formation was proposed as the shrinkage during anatase-to-rutile phase transformation, the difference in the thermal expansion coefficient (TEC) of two crystals, and further decomposition of remaining organic components trapped in the core. The core/shell particles showed enhanced photodecomposition rates compared to spherical shape particles and other commercially available particles most probably due to the increased surface area by the nanoporous and nanocrystalline structure of the anatase core.

Original languageEnglish
Pages (from-to)805-808
Number of pages4
JournalCrystal Growth and Design
Volume6
Issue number4
DOIs
Publication statusPublished - 2006 Apr 1

Fingerprint

Photocatalysts
Crystallization
Titanium dioxide
titanium
Titanium
anatase
crystallization
rutile
Polyethylene oxides
Phase transitions
phase transformations
nanostructure (characteristics)
photodecomposition
Particles (particulate matter)
Sol-gels
Thermal expansion
ethylene oxide
shrinkage
thermal expansion
Decomposition

ASJC Scopus subject areas

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

Cite this

Controlled crystallization of nanoporous and core/shell structure titania photocatalyst particles. / Sung, Yun Mo; Lee, Jin Kyung; Chae, Won Seok.

In: Crystal Growth and Design, Vol. 6, No. 4, 01.04.2006, p. 805-808.

Research output: Contribution to journalArticle

@article{fc208bcc8a2b432190ca6a6f0916288c,
title = "Controlled crystallization of nanoporous and core/shell structure titania photocatalyst particles",
abstract = "Poly(ethylene oxide) (PEO)-titania (TiO2) organic-inorganic hybrid particles were synthesized using sol-gel chemistry and crystallized at 600, 800, and 900 °C. Anatase/rutile core/shell-structured titania particles were obtained through partial phase transformation (∼70{\%}) of anatase to rutile at 800 °C. The mechanism of core/shell structure formation was proposed as the shrinkage during anatase-to-rutile phase transformation, the difference in the thermal expansion coefficient (TEC) of two crystals, and further decomposition of remaining organic components trapped in the core. The core/shell particles showed enhanced photodecomposition rates compared to spherical shape particles and other commercially available particles most probably due to the increased surface area by the nanoporous and nanocrystalline structure of the anatase core.",
author = "Sung, {Yun Mo} and Lee, {Jin Kyung} and Chae, {Won Seok}",
year = "2006",
month = "4",
day = "1",
doi = "10.1021/cg050342m",
language = "English",
volume = "6",
pages = "805--808",
journal = "Crystal Growth and Design",
issn = "1528-7483",
publisher = "American Chemical Society",
number = "4",

}

TY - JOUR

T1 - Controlled crystallization of nanoporous and core/shell structure titania photocatalyst particles

AU - Sung, Yun Mo

AU - Lee, Jin Kyung

AU - Chae, Won Seok

PY - 2006/4/1

Y1 - 2006/4/1

N2 - Poly(ethylene oxide) (PEO)-titania (TiO2) organic-inorganic hybrid particles were synthesized using sol-gel chemistry and crystallized at 600, 800, and 900 °C. Anatase/rutile core/shell-structured titania particles were obtained through partial phase transformation (∼70%) of anatase to rutile at 800 °C. The mechanism of core/shell structure formation was proposed as the shrinkage during anatase-to-rutile phase transformation, the difference in the thermal expansion coefficient (TEC) of two crystals, and further decomposition of remaining organic components trapped in the core. The core/shell particles showed enhanced photodecomposition rates compared to spherical shape particles and other commercially available particles most probably due to the increased surface area by the nanoporous and nanocrystalline structure of the anatase core.

AB - Poly(ethylene oxide) (PEO)-titania (TiO2) organic-inorganic hybrid particles were synthesized using sol-gel chemistry and crystallized at 600, 800, and 900 °C. Anatase/rutile core/shell-structured titania particles were obtained through partial phase transformation (∼70%) of anatase to rutile at 800 °C. The mechanism of core/shell structure formation was proposed as the shrinkage during anatase-to-rutile phase transformation, the difference in the thermal expansion coefficient (TEC) of two crystals, and further decomposition of remaining organic components trapped in the core. The core/shell particles showed enhanced photodecomposition rates compared to spherical shape particles and other commercially available particles most probably due to the increased surface area by the nanoporous and nanocrystalline structure of the anatase core.

UR - http://www.scopus.com/inward/record.url?scp=33646379850&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33646379850&partnerID=8YFLogxK

U2 - 10.1021/cg050342m

DO - 10.1021/cg050342m

M3 - Article

AN - SCOPUS:33646379850

VL - 6

SP - 805

EP - 808

JO - Crystal Growth and Design

JF - Crystal Growth and Design

SN - 1528-7483

IS - 4

ER -