Development of Noble Metal-Gate TiO_2 Schottky Diode DH sensor

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An application of hydrogen-sensitive metal-gate Schottky barrier diodes to dissolved hydrogen (DH) sensors was examined. Single crystals of Nb_2O_5-doped TiO_2 and thin films of Pd-base alloy (Pd-Ag, Pd-Au, Pd-Pt) were used as a semiconductor and a catalytic metal-gate of diodes, respectively. The DH response of the diodes was first examined in aqueous solutions with various DH concentrations at 298K.It was found that Pd-30-40at%Ag alloy-gate diodes showed a high sensitivity to DH over a wide concentration range. They did not suffer from hydrogen embrittlement at 298K and had a good corrosion resistance at elevated temperatures. Linear relationships between the response voltage of Pd-30-40at%Ag diodes and the DH concentration of solutions were found at every temperatures examined (1298-573K) . The sensitivities of the diodes to pH were less than 10% of their sensitivities to DH.The diodes showed good long-term stability, while their DH response rate decreased after prolonged exposure in high-temperature solutions.