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Spatial distribution of single guest molecules along thickness of thin films of poly(2-hydroxyethyl acrylate)

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Abstract

We have investigated three-dimensional distribution and diffusion behaviors of single guest dyes in 1-µm thick films of poly(2-hydroxyethyl acrylate) (PHEA) by using astigmatism imaging method. Perylene diimide derivative (BP-PDI) in the PHEA films localized along the Z-axis at ca. Z = 600–700 nm distant from the interface (Z = 0) between PHEA and glass substrate. This Z-localization was not observed in different polymer films of poly(methyl methacrylate) (PMMA), poly(methyl acrylate) (PMA), and polystyrene (PSt). Because the glass transition temperature of the PHEA is lower than the room temperature, BP-PDI in the PHEA films exhibited Brownian motion, normal diffusion on the XY plane and confined motion along the Z-direction. For elucidating the mechanism of the peculiar localization of the guest dyes along film thickness in the PHEA films, we measured diffusion behaviors of different dyes, R6G and Atto 488, in 1-µm thick PHEA films, obtaining result that the Z-distributions of the dyes were overall similar to that of BP-PDI. The result indicates that the Z-localization of the guest dyes should be ascribed not to the interaction between glass surface and guest dye but mainly to the Z-dependent property of the PHEA film. Indeed, the lateral diffusion coefficients of the guest dyes depended on their Z-positions.

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Acknowledgements

The present work was supported by JSPS KAKENHI Grant Numbers JP16H06505, JP26107002, JP26107013, JP18K19057, JP21K18934, JP21H04964, JP21H04640, and JP21KK0092 and by JST-Mirai Program Grant Number JPMJMI21G1, Japan. This work is also supported by Frontier Photonic Sciences Project of National Institutes of Natural Sciences (NINS) (Grant Number 01212010).

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Authors and Affiliations

  1. Division of Frontier Materials Science and Center for Promotion of Advanced Interdisciplinary Research, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka, 560-8531, Japan

    Syoji Ito, Kengo Hiratsuka & Hiroshi Miyasaka

  2. Research Institute for Light-Induced Acceleration System (RILACS), Osaka Prefecture University, 1-2, Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8570, Japan

    Syoji Ito

  3. Eco-Material Engineering, Toyama Prefectural University, Imizu, Toyama, 939-0398, Japan

    Satoshi Takei

  4. Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan

    Hiroyasu Nishi, Daichi Kitagawa & Seiya Kobatake

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  1. Syoji Ito
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  2. Kengo Hiratsuka
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  3. Satoshi Takei
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Correspondence to Syoji Ito or Hiroshi Miyasaka.

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Ito, S., Hiratsuka, K., Takei, S. et al. Spatial distribution of single guest molecules along thickness of thin films of poly(2-hydroxyethyl acrylate). Photochem Photobiol Sci 21, 175–184 (2022). https://doi.org/10.1007/s43630-021-00147-2

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