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Relationship between Surface Morphology and Electroabsorption Spectrum of an Oxacyanine Chromophore in a Mixed Langmuir−Blodgett Film

Nobuhiro Ohta, Mitsuhiro Nakamura, Iwao Yamazaki, Masatsugu Shimomura, Kuniharu Ijiro

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Abstract

Surface morphology of oxacyanine dye (OC) suddenly changes in mixed Langmuir−Blodgett films composed of OC, arachidic acid, and methyl arachidate when the OC fraction becomes more than 30 mol %. The agglomerates of OC show a ring structure just like a rubber band. The diameter and the shape of the “rubber band” change with different OC fractions, and microcrystalline domains appear when J-type aggregates are formed. The morphological change of the surface monolayer is well-correlated with a change in the electroabsorption spectra of the OC chromophore.

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What this paper is about

Surface morphology of oxacyanine dye (OC) suddenly changes in mixed Langmuir−Blodgett films composed of OC, arachidic acid, and methyl arachidate when the OC fraction becomes more than 30 mol %. The agglomerates of OC show a ring structure just like a rubber band. The diameter and the shape of the “rubber band” change with different OC fractions, and microcrystalline domains appear when J-type aggregates are formed. The morphological change of the surface monolayer is well-correlated with a change in the electroabsorption spectra of the OC chromophore.

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Available abstract

Surface morphology of oxacyanine dye (OC) suddenly changes in mixed Langmuir−Blodgett films composed of OC, arachidic acid, and methyl arachidate when the OC fraction becomes more than 30 mol %. The agglomerates of OC show a ring structure just like a rubber band. The diameter and the shape of the “rubber band” change with different OC fractions, and microcrystalline domains appear when J-type aggregates are formed. The morphological change of the surface monolayer is well-correlated with a change in the electroabsorption spectra of the OC chromophore.

Key concepts: Arachidic acid, Langmuir–Blodgett film, Chromophore, Morphology (biology), Monolayer, Microcrystalline, Natural rubber, Chemistry

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