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Report No.
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Identification of doped nitrogen in photocatalytic TiO$$_{2}$$

Yamaguchi, Daisuke; Hasegawa, Yoshio*; Hishinuma, Yukio*; Suzuki, Masashi*; Kodama, Hiroto*; Koizumi, Satoshi*; Noda, Yohei; Oba, Yojiro*

Anion, e.g., nitrogen (N) doped titanium dioxide (TiO$$_{2}$$), being expected to exhibit an improved photo-catalytic property due to the effect of narrowing in the band gap, was investigated by small- (SANS) and wide-angle neutron scattering. Among wide variety of photo-catalytic products, TiO$$_{2}$$ is one of the most promising and various improvements have been done. However, the difference in structure between bare TiO$$_{2}$$ and N-doped TiO$$_{2}$$ has not yet definitively clarified despite the considerable structural analyses by X-ray diffraction or X-ray photoemission spectroscopy. With profiting from an enhanced scattering length of N atoms to the neutron beam, an attempt to capture the distribution of N atoms in N-doped TiO$$_{2}$$ by SANS was conducted. Specimens prepared with and without N-doping were compared. The traces of doped N species on the scattering profiles might be brought out from invisible differences with contrast variation method employing the soakage in tuned H$$_{2}$$O/D$$_{2}$$O mixture possessing nearly the same scattering length density as TiO$$_{2}$$ component.

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