Abstract
Gravimetric and electrochemical studies were made on surface phenomena of evaporated gold by measuring the change in wieght, single electrode potential, and electric resistance of the thin films deposited under 1-3×10-5 Torr. The films showed some reactivity with oxygen in the dry air, though bulky gold is chemically inactive. The temperature of the film substrate had effects on the weight increase of the films due to oxidation and adsorption. The rate of weight increase of a film prepared at 30°C was lower than that of a film prepared at 200°C, but the total amount of oxygen adsorbed on the former film was greater than that adsorbed on the latter film. A very thin film obtained on the substrate of 30°C by low rate of evaporation showed a peculiar process of weight change with time in the dry air; the process was quite different from those of ther films. That is, the weight increase of the film due to adsorption of oxygen continued for about 1hr., and then, gradually decreased. It was found by the measurement of single electrode potential that the deposit prepared by high deposition rate on the substrate at a low temperature (such as 30°C) showed a thin film having smooth continuous texture (not insular structure), which was chemically active against oxygen.
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