Preparation of TiO2 Thin Films Using Octadecylamine Langmuir-Blodgett Films and Evaluation of Their Photocatalytic Activity

Takahashi, Masashi; Sendoh, M.; Kobayashi, Koichi; Tajima, Kazuo

doi:10.5650/jos.60.25

Cited by 1 publication

(1 citation statement)

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“…This technique has already been used to prepare semiconducting TiO 2 ultrathin films. [15][16][17][18][19][20] Recently, we have reported the preparation of ultrathin SnO 2 films by this technique and the resulting ultrathin oxide film has shown high selectivity and sensitivity for the detection of NH 3 at room temperature. 21,22 In this article, we report a new route for the fabrication of ultrathin composite films of PdO and TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

A new route for the fabrication of an ultrathin film of a PdO–TiO2 composite photocatalyst

et al. 2012

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Ultrathin PdO-TiO(2) composite films have been prepared for the first time by thermal decomposition of the multilayer Langmuir-Blodgett (LB) films of octadecyl amine-metal (Ti and/or Pd) ion complexes. The composite oxide film has been characterized by various spectroscopic techniques and compared with the pure ultrathin TiO(2) film. The results of X-ray diffraction (XRD) and Raman spectroscopy reveal the formation of a mostly crystalline anatase phase in the pure TiO(2) thin film whereas separate phases of PdO and TiO(2) in the composite thin film. Crystallite sizes of 4-7 nm have been estimated from the XRD line broadening. Atomic force microscopy images also reveal oriented aggregates of nanocrystallites in the ultrathin films. The results of absorption spectroscopy have shown allowed direct transitions in both films. Pure TiO(2) and the composite films have been compared for their ability to act as photocatalysts in hydrogen generation from a methanol-water mixture. It is found that the composite film has a uniform hydrogen generation rate for a long period of time and shows drastic enhancement in hydrogen production as compared to pure TiO(2) film. This is because Pd in the composite film acts as an electron trapping centre and thereby decreases the recombination process in the oxide catalyst. The present study demonstrates the potential of the LB technique to fabricate high quality composite metal oxide films useful for photocatalytic hydrogen generation.

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