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Structural analysis for visible light reactive nitrogen-doped titanium oxide

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

Among the wide variety of photo-catalytic products titanium dioxide (TiO$$_{2}$$)) is one of the most promising material and various improvement has been attempted. Recently it has been confirmed that the nitrogen (N)-doped TiO$$_{2}$$ can be activated not only by ultraviolet light but also by visible light and thereby an enhancement of the efficiency is attained. However, the difference in structure between bare TiO$$_{2}$$ and N-doped one has not yet been fully clarified despite the considerable structural analyses by using X-ray diffraction (XRD) or microscopy. In this study the structure of N-doped TiO$$_{2}$$ was studied by small-angle neutron (SANS) and X-ray scattering (SAXS) methods by profiting the considerable difference of the scattering contrast of N atom to the neutron and to the X-ray. The resultant SANS and SAXS profiles are different between them, especially at high q region of (q$$geq$$1(nm$$^{-1}$$), where q denotes the magnitude of scattering vector. This result can be interpreted as the localization of N atoms at around the surface area.

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