Effects of substrate temperature on the growth of thin platinum deposits on rock salt

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Abstract
Effects of rock salt substrate temperatures before and during deposition of platinum were examined. Crystallographic orientation and uniformity of particle distribution increased with increasing predeposition substrate temperature at a fixed deposition temperature of 200°c. Crystallographic orientation and particle density decreased with increasing deposition substrate temperature at a fixed predeposition substrate temperature at 450°c. For a fixed predeposition substrate temperature of 400°c and a deposition temperature of 200°c, varying the deposition time from 15 min to 1 min at a constant incidence rate of 8 × 1012 cm−2 sec−1 did not result in a significant change in the surface density of particles, indicating that nucleation was completed in less than 1 min and only growth was being observed. The observed temperature dependence of the surface density of particles indicates that this particle density is apparently diffusion controlled, but the existence of preferential growth sites on the substrate surface remains as a possibility.

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