Morphology-Dependent Electrical Memory Characteristics of a Well-Defined Brush Polymer Bearing Oxadiazole-Based Mesogens
SCIE
SCOPUS
- Title
- Morphology-Dependent Electrical Memory Characteristics of a Well-Defined Brush Polymer Bearing Oxadiazole-Based Mesogens
- Authors
- Wonsang Kwon; Byungcheol Ahn; Dong Min Kim; Yong-Gi Ko; Suk Gyu Hahm; Youngkyoo Kim; Hwajeong Kim; Ree, M
- Date Issued
- 2011-10-06
- Publisher
- ACS publications
- Abstract
- A new oxadiazole-containing brush polymer, poly(5-phenyl-1,3,4-oxadiazol-2-yl-[1,1'-biphenyl]carboxyloxy- n-nonyl acrylate) (PPOXBPA), was synthesized. The polymer was thermally stable up to 350 degrees C. Below the degradation temperature, it showed a glass transition, crystal melting transition, and a liquid crystal to isotropic melt transition. Its optical and electrochemical properties were also investigated. This brush polymer was found to always self-assemble into a multibilayer structure, with partial interdigitation between bristles from different layers occurring via the pi-pi stacking of the oxadiazole mesogen units. Interestingly, when the polymer film was applied in devices with a bottom and top electrode, it showed either volatile or nonvolatile memory behavior, depending on the ordering and orientation of the multibilayer structure (particularly, the pi-pi stacked oxadiazole mesogen units), which could be controlled via thermal annealing. The switching mechanisms of these electrical memory behaviors were investigated. Collectively, these results demonstrate that this chemically well-defined brush polymer is suitable for use as an active material for the low-cost, mass production of high-performance, programmable volatile and nonvolatile memory devices via control of the morphological structure.
- Keywords
- ORGANOSILICATE DIELECTRIC FILMS; LIQUID-CRYSTALLINE POLYMERS; CHARGE-LIMITED CURRENTS; ANTHRACENE THIN-FILMS; RADICAL POLYMERIZATIONS; SEMICONDUCTING POLYMER; CONJUGATED POLYMER; BLOCK-COPOLYMERS; PHASE STRUCTURES; DEVICES
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/17016
- DOI
- 10.1021/JP205719K
- ISSN
- 1932-7447
- Article Type
- Article
- Citation
- JOURNAL OF PHYSICAL CHEMISTRY C, vol. 115, no. 39, page. 19355 - 19363, 2011-10-06
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