Structures and electrical properties of ferroelectric copolymer ultrathin films |
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Authors: | Kei Kobayashi Hiroyuki Masuda Kazumi Matsushige |
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Affiliation: | a International Innovation Center, Kyoto University, Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan b Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan |
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Abstract: | Ultrathin films of ferroelectric copolymer vinylidenefluoride and trifluoroethylene, P(VDF-TrFE), were successfully obtained by spin-coating and their nanoscale structures and electrical properties were studied utilizing atomic force microscopy (AFM). We succeeded in obtaining ultrathin copolymer films on graphite whose thickness ranged from 1 nm to several tens of nanometers by controlling concentration of copolymer solutions in methylethylketone. We found that ultrathin films thinner than 4 nm showed layered structures whose layer thickness was about 0.5 nm. On the other hand, films thicker than 4 nm formed typical edge-on lamellar crystal structures. Furthermore, we investigated surface potential distribution and piezoelectric property by AFM-based techniques and discussed interaction between electrical dipoles in the molecular chains and graphite substrate. |
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Keywords: | Ferroelectric polymer Ultrathin film Atomic force microscopy Piezoresponse force microscopy |
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