A novel supramolecular self-assembly thin film with spontaneous polar order
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Kim, Oh-Kil, Ling-Siu Choi, He-Yi Zhang, Xue-Hua He, and Yan-Hua Shih. “A Novel Supramolecular Self-Assembly Thin Film with Spontaneous Polar Order.” Thin Solid Films 327–329 (August 1998): 172–75. https://doi.org/10.1016/S0040-6090(98)00622-1.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
A novel supramolecular thin film in which a non-linear optical (NLO) chromophore is uniaxially included in the helical cavity of amylose, revealed a spontaneous self-assembly with a long-range polar order of the chromophores perpendicular to the film surface. This was manifested by a significantly large second harmonic generation (SHG) observed from solution-cast solid supramolecular thin films on a glass substrate without any external field. Such self-assembly/self-poling and the long-term polar stability of the supramolecular chromophores are thought to be due to the helical rigid-rod structure, their dipolar and/or chiral recognition in the ordering process following the polar initiation through the interface interaction of the chromophore with the glass substrate, and H-bonding among the ordered supramolecules.