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Blackening of titanium dioxide nanoparticles by atomic hydrogen and the effect of coexistence of water on the blackening

藤本 将秀*; 松本 益明*; 長塚 直樹*; 福谷 克之

Fujimoto, Masahide*; Matsumoto, Masuaki*; Nagatsuka, Naoki*; Fukutani, Katsuyuki

A fast blackening process of titanium dioxide nanoparticles by exposing to atomic hydrogen was studied by estimating the color of the nanoparticles. The whiteness of TiO$$_{2}$$ decreased exponentially with time, which suggests a first-order reaction between atomic H and surface oxygen, whose rate constant is proportional to the ambient pressure of H$$_{2}$$. The rate constant increases as the temperature of nanoparticles at exposing to atomic hydrogen. The structure and size of nanoparticles were estimated by the X-ray diffraction (XRD), which shows that a part of anatase transferred to rutile and the crystal sizes of both anatase and rutile increased by hydrogenation above 600 K. The blackening of TiO$$_{2}$$ halfway stopped under the condition of the similar partial pressure of water with hydrogen. This suggests the presence of reverse reaction between H$$_{2}$$O and oxygen vacancy, whose reaction rate constant is proportional to the partial pressure of H$$_{2}$$O.

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