Figure 7From: Ni-doped TiO2 nanotubes for wide-range hydrogen sensingAtomic geometries of Ni-doped TiO 2 (101) surface. The gray, red and blue balls represent O, Ti, and Ni atoms, respectively. O2C, O3C, Ti5C, Ti6C, Ni5C, and Ni6C mean the most probable sites for the adsorption.Back to article page