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Various ultra-thin Pt films (UPF) have been made by low energy sputtering and studied as a function of the sputtering time. Their resistance was measured at various temperature. It is found that two main different average thickness of the Pt films have different two-dimensional fine structures. One of these specimens discloses a discontinuous island structure whereas the other does a semicontinuous one. The electrical properties of these UPF were measured in both vacuum atmosphere and hydrogen. It is found that the electrical conductivity of the UPF in hydrogen gas was higher than in vacuum. Such difference depends on the two-dimensional fine structure characteristics. Moreover, It is shown that there is reproducibility in the gas response.

The Gas-atmosphere Effect on the Electrical Conductivity of Ultra-thin Pt films.