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. 2015 Dec 2;5:17634. doi: 10.1038/srep17634

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(a) FTIR absorption spectra. The inset shows the FTIR spectrum of the atom-hydrogenated TiO₂ after a 10 min-dehydrogenation at 700 ºC. (b) Optical absorption spectra. The band gap values are given. (c) Optical images of the blank, vacuum-annealed, gas-hydrogenated and atom-hydrogenated samples (from left to right). (d) Valence-band spectra of synchrotron radiation.