Unique phase transformation behavior and visible light photocatalytic activity of titanium oxide hybridized with copper oxide

Tae Woo Kim, Hyung Wook Ha, Mi Jeong Paek, Sang Hoon Hyun, Jin Ho Choy, Seong Ju Hwang

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The nanoscale hybridization of titanium oxide with copper oxide was carried out to control the phase transformation behavior of titanium oxide and develop a new photocatalyst active in visble light. Analysis by X-ray diffraction, electron microscopy, and nitrogen adsorption-desorption isotherm to gauge pore size distribution showed that intercalative hybridization between copper oxide and titanium oxide produced a mesoporous layer-by-layer interstratified heterostructure with a repeating distance of ∼24.2 Å and an average pore size of ∼52 Å. X-ray absorption spectroscopy at Cu K- and Ti K-edges clearly demonstrated that divalent copper oxides were interstratified with lepidocrocite-type titanium oxide. As a result of the modification of band structure, the resulting nanohybrids showed high activity for photoinduced degradation of organic dye molecules under visible light illumination. Heat-treatment of the nanohybrids at 500°C produced anatase TiO 2 at the expense of intermediate rutile TiO 2 formed in the lower temperature region (300-400°C). This suggests a phase transition from rutile TiO 2 to anatase TiO 2 . This phenomenon is related to the variation in the surface energy of titania caused by the redox process of hybridized copper oxide and by the phase transition of co-existing Ti-deficient titanium oxide.

Original languageEnglish
Pages (from-to)3238-3245
Number of pages8
JournalJournal of Materials Chemistry
Volume20
Issue number16
DOIs
Publication statusPublished - 2010 Apr 9

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Copper oxides
Titanium oxides
Phase transitions
Titanium dioxide
Pore size
X ray absorption spectroscopy
Photocatalysts
Interfacial energy
Band structure
Electron microscopy
Gages
Isotherms
Heterojunctions
Desorption
Dyes
Titanium
Lighting
Heat treatment
titanium dioxide
Nitrogen

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Kim, Tae Woo ; Ha, Hyung Wook ; Paek, Mi Jeong ; Hyun, Sang Hoon ; Choy, Jin Ho ; Hwang, Seong Ju. / Unique phase transformation behavior and visible light photocatalytic activity of titanium oxide hybridized with copper oxide. In: Journal of Materials Chemistry. 2010 ; Vol. 20, No. 16. pp. 3238-3245.
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Unique phase transformation behavior and visible light photocatalytic activity of titanium oxide hybridized with copper oxide. / Kim, Tae Woo; Ha, Hyung Wook; Paek, Mi Jeong; Hyun, Sang Hoon; Choy, Jin Ho; Hwang, Seong Ju.

In: Journal of Materials Chemistry, Vol. 20, No. 16, 09.04.2010, p. 3238-3245.

Research output: Contribution to journalArticle

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