Ti/B binary oxide thin films

Dohshi S., Takeuchi M. and Anpo M. (2003), Effect of the local structure of Ti oxide species on the photocatalytic reactivity and photoinduced superhydrophUic properties of Ti/Si and Ti/B binary oxide thin films , Catal.Today 85, 199-206. 

In this section, Ti/Si and Ti/B binary oxide thin films were prepared by the ICB method using multi-ion sources. Characterization studies were carried out by spectroscopic measurements such as XRD, XAFS and UV-Vis, in order to elucidate the local structure of the Ti oxide species of these thin films. The photocatalytic reactivity was also evaluated for significant reactions such as the decomposition of NO to produce N2 and O2 as well as N2O as a minor product under UV light irradiation. Moreover, the photoinduced super-hydrophilic properties were evaluated by measuring the changes in the contact angle of water droplets under UV irradiation and under dark conditions at 298 K. 

Ti/Si and Ti/B binary oxide thin films with various Ti02 compositions were prepared by the ICB method on a quartz substrate. As a pretreatment, the quartz substrates were ultrasonically cleansed for 15 min in acetone, then dried and annealed at 723 K for 5 h in air. The source materials, Ti metal and SiO (or B2O3) powder, were heated at high temperatures, then Ti and SiO (or B2O3) vapors were... 

On the other hand, for the Ti/B binary oxide thin films with low Ti02 compositions, the XANES spectra (Figure 19.5, left) exhibit three small characteristic preedge peaks which can be attributed to the Ti02 with an anatase crystalline structure. In the Fourier transforms of the EXAFS spectra for the Ti/B thin films (Figure 19.5, right), not only the Ti-O peak but also the Ti-O-Ti peak can be seen. 

Figure 19.5 XAFS (XANES and Fourier transforms of EXAFS) spectra of Ti/B binary oxide thin films. Ti02 content (%) (a, A) 5.0, (b, B) 10.0, and (c, C) 50.0...

The Results of the Curve Fitting Analysis of the FT-EXAFS Data for Ti02 Thin Films as well as Ti/Si and Ti/B Binary Oxide Thin Films... 

Figure 19.6 UV-Vis absorption spectraby transmittance method of Ti/Si and Ti/B binary oxide thin films (a) Ti02, (b) Ti/B (5/95), and (c) Ti/Si (6.6/93.4)...

Figure 19.8 The changes in the contact angle of water droplets under UV light irradiation on Ti/B binary oxide thin films...

Anpo, M., Dohshi, S., and Takeuchi, M. Preparation of Ti/B binary oxide thin films by the ionized cluster beam (ICB) method Their photocatalytic reactivity and photoinduced superhydrophilic properties. J. Ceram. Process. Res. 2002, 34, 258. 

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