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Identification of doped nitrogen in photocatalytic TiO$$_{2}$$

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

Anion doped titanium dioxide (TiO$$_{2}$$), which is expected to exhibit an improved photo-catalytic property due to the effect of narrowing in the band gap, was investigated by small-angle neutron scattering (SANS). Among wide variety of photo-catalytic products, TiO$$_{2}$$ is one of the most promising and various improvements have been done. On the functional aspect it has been confirmed that for instance, nitrogen (N) doped TiO$$_{2}$$ can be activated not only by the photons of which wavelength is corresponding to ultraviolet but also by those of visible light and thereby an enhancement of the efficiency is attained. 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 using X-ray probes. With profiting from an enhanced scattering length of N atoms to the neutron beam, an attempt to capture the distribution of N atoms in the N-doped TiO$$_{2}$$ by SANS is presented here.

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