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We report in situ characterized TiO2 thin-films deposited on optical fiber,having thicknesses in the 20-100nm range, and having enhanced conductivityvalues of 700S/cm upon interacting with hydrogen. This conductivity wasachieved in pure hydrogen at 800-900C, having a measured activation energy of0.26eV of the hopping type. Given the variability in the observed results, itis postulated that the highest conductivity achievable may be much greater thanwhat is currently demonstrated. The conductivity is retained after cooling toambient temperatures as confirmed by Hall measurements, and subsequentgrazing-incidence x-ray diffraction and TEM measurements show the films to bein the rutile phase. The exceptional conductivity in these films ishypothesized to result from direct proton incorporation into the latticepopulating the conduction band with excess electrons, or from altering theTitania lattice to form conductive Magneli phases. The films did not displayany evidence of transformations, however formation of Magneli phases wasconfirmed for powders. These interesting results, observed by examining 20nmfilms on the surface of optical fiber in combination with the first impedancespectroscopy performed on films on optical fiber in high temperature Fuel Celltype environments, confirm hypotheses arrived at in prior publications wherethin-films of Titania had optical properties which could only be explained bythe current claim. Titania thin-films on optical-fiber are being explored forhigh temperature hydrogen derived energy generation, thermo-photonic energyconversion, and associated sensors due to their unique interactions withhydrogen.

In Situ characterization of the proton enhanced conductivity of 20nm TiO2 thin-films obtained on the surface of optical fiber