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(a) The structural and the band model of oxide material showing the role of pores contact regions in determining the conductance over the TiO2 due to the adsorption/desorption process of oxidizing and reducing gases. (b) The model illustrating the band bending in the metal oxide material due to the ionosorption of oxygen on the material surface. EC, EV, and EF denote the energy of the conduction band, valence band, and the Fermi level, respectively.
