An evaluation of fluorinated titanium oxide nanocrystals with UV exposure treatment for oxygen vacancy control

Wooje Han, Jiwan Kim, Hyung Ho Park

Research output: Contribution to journalArticle

Abstract

The oxygen vacancy properties of densified titanium oxide (TiO2) nanocrystals (NCs) with different surface ligand states were evaluated. Fluorous ligand modification resulting in the high densification of NCs and the effect of residual ligands on the surface of the NCs using ultraviolet (UV)-exposure treatment were investigated. After synthesizing the TiO2 NCs at 80 °C, their modification proceeded using 2,2,2-trifluoroacetic acid as the fluorous ligand. NC thin films were formed using spin-casting, after which the UV-exposure treatment was performed. According to the analytical results of crystalline size, surface, optical properties, and surface ligand states of the TiO2 NCs, the ligands on the NCs were decomposed by the UV-exposure treatment under various atmospheres and the flatness of the NC thin films was found to be controlled by the fluorous ligand modification. Thus, the recombination effect of the oxygen vacancies could be controlled by the fluorous ligand modification and UV-exposure treatment.

Original languageEnglish
Pages (from-to)824-830
Number of pages7
JournalApplied Surface Science
Volume489
DOIs
Publication statusPublished - 2019 Sep 30

Fingerprint

Titanium oxides
Oxygen vacancies
titanium oxides
Nanocrystals
nanocrystals
Ligands
ligands
evaluation
oxygen
Trifluoroacetic acid
Trifluoroacetic Acid
Thin films
titanium dioxide
flatness
densification
thin films
Densification
Casting
Optical properties
Crystalline materials

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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abstract = "The oxygen vacancy properties of densified titanium oxide (TiO2) nanocrystals (NCs) with different surface ligand states were evaluated. Fluorous ligand modification resulting in the high densification of NCs and the effect of residual ligands on the surface of the NCs using ultraviolet (UV)-exposure treatment were investigated. After synthesizing the TiO2 NCs at 80 °C, their modification proceeded using 2,2,2-trifluoroacetic acid as the fluorous ligand. NC thin films were formed using spin-casting, after which the UV-exposure treatment was performed. According to the analytical results of crystalline size, surface, optical properties, and surface ligand states of the TiO2 NCs, the ligands on the NCs were decomposed by the UV-exposure treatment under various atmospheres and the flatness of the NC thin films was found to be controlled by the fluorous ligand modification. Thus, the recombination effect of the oxygen vacancies could be controlled by the fluorous ligand modification and UV-exposure treatment.",
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An evaluation of fluorinated titanium oxide nanocrystals with UV exposure treatment for oxygen vacancy control. / Han, Wooje; Kim, Jiwan; Park, Hyung Ho.

In: Applied Surface Science, Vol. 489, 30.09.2019, p. 824-830.

Research output: Contribution to journalArticle

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