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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 12
BKCSDE 28(12)
December 20, 2007

Title	Band Gap Tuning in Nanoporous TiO₂-ZrO₂ Hybrid Thin Films
Author	Chang-Sik Kim, Hyun-Dam Jeong*
Keywords	Nanoporous, TiO₂, ZrO₂, Thin film, Band gap
Abstract	Nanoporous TiO2 and ZrO₂ thin films were spin-coated using a surfactant-templated approach from Pluronic P123 (EO₂₀PO₇₀EO₂₀) as the templating agent, titanium alkoxide (Ti(OC₄H₉)₄) as the inorganic precursor, and butanol as a the solvent. The control of the electronic structure of TiO2 is crucial for its various applications. We found that the band gap of the hybrid nanoporous thin films can be easily tuned by adding an acetylacetonestabilized Zr(OC₄H₉)₄ precursor to the precursor solution of Ti(OC₄H₉)₄. Pores with a diameter of 5 nm-10 nm were randomly dispersed and partially connected to each other inside the films. TiO₂ and ZrO₂ thin films have an anatase structure and tetragonal structure, respectively, while the TiO₂-ZrO₂ hybrid film exhibited no crystallinity. The refractive index was significantly changed by varying the atomic ratio of titanium to zirconium. The band gap for the nanoporous TiO2 was estimated to 3.43 eV and that for the TiO₂-ZrO₂ hybrid film was 3.61 eV.
Page	2333 - 0
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