1990 Fiscal Year Final Research Report Summary
Control of Molecular Orientation of Organic Thin Films by Electric Field
| Project/Area Number |
01550237
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
電子材料工学
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| Research Institution | Yamagata University |
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Principal Investigator |
OKUYAMA Katsuro Yamagata University, Dept. of Electrical and Information Eng., Professor, 工学部, 教授 (70007011)
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| Co-Investigator(Kenkyū-buntansha) |
OHSHIMA Shigetoshi Yamagata University, Dept. of Elecrical and Information Eng., Assistant Professo, 工学部, 助教授 (40124557)
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| Project Period (FY) |
1989 – 1990
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| Keywords | Calcium stearate / Vacuum deposition / Epitaxial growth / Effect of electric field |
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| Research Abstract |
1. The growth habits of calcium stearate films evaporated onto NaCl (001) have been investigated as a function of substrate temperature.
(1) For substrate temperatures between 25 and 50^ﾟC, needle like crystallites grow epitaxially with their long axis pointing in two directions in such a way as, calcium stearate (110), [001]/NaCl (001), <110>.
(2) For substrate temperatures above 70^ﾟC, calcium stearate grows also epitaxially with its c-axis normal to the substrate ; calcium stearate (001), [110]/NaCl (001), [100].
(3) Most frequently for the substrate temperatures between 55 and 65^ﾟC, and sometimes above 70^ﾟC, needle like crystallities with their long axis pointing in one direction, either [110] or [110] NaCl was observed. This anomalous orientation was attributed to the growth of the needle-lke crystallites on the performed underlayer of calcium stearate oriented with the c-axis normal to the substrate.
2. Effect of electric field on the orientation of calcium stearate thin films was investigated.
(1) Partially ionized vapor (-0.1%) of calcium stearate was deposited onto NaCl at room temperature. Along [110] direction of the NaCl substrate, an electric field of 100-200v/cm was applied during deposition. Lateral crystallites of calcium stearate were distorted in orientation and shape by the electric field particularly in the region near the negative electrode.
(2) When an electric field of 30v/cm was applied along the surface of a glass substrate, the c-axis of the lateral crystallites was observed to be parallel to the electric field. However, this phenomenon was not reproducible and is now under investigation.
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Research Products
(2 results)
