直鎖分子性物質の蒸着膜における表面形態

概要

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Observations on the film surfaces on stearic acid deposited onto the substrates of stearic acid, mica and NaCl single crystals have been made by the electron microscope in order to study the film formation and the growth mechanism of straight-chain molecular substance. Vacuum-deposition of stearic acid carried out at the deposition rates ranging from 5 Å/min to 50 Å/min. The residual gas pressure was 5×10<SUP>-6</SUP> Torr and the temperature of the substrate during the deposition was 25°C. The island structures corresponding to nucleation and growth model were observed on the substrates of mica and NaCl. The some of the grains standing up from surface and the growth hills consisting of the fan shaped steps were observed. The minimum film thickness of the growth hills which appeared on the surfaces of the deposited stearic acid was 150 Å on the substrates of stearic acid and 300 Å on mica and on NaCl. The habits of the growth hills were B and C form on stearic acid and C form both on mica and on NaCl, whereas the deposited films were single crystal films. The film formations and the surface morphologies of stearic acid have been discussed.
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