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Schematic drawing of the sample cell. The cell was filled with a hydrogen and nitrogen gas mixture during the experiments.
Time-domain THz wave forms from the sample in the hydrogen and nitrogen gas mixture. The solid, dashed, and dotted lines represent the wave form for hydrogen gas concentrations of , , and 1%, respectively. The inset shows the enlargement around the positive peak (between 10.5 and ).
The peak amplitude of the THz radiation as a function of the hydrogen gas concentration. The open and closed circles represent THz radiation from the - and -thick palladium film samples, respectively.
(a) Typical time dependent response of the MOSFET hydrogen sensor and (b) the gate-drain voltage response of the device as a function of the hydrogen gas concentration.
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