Quantitative detection of force-fluroscence correlation by self- assembled nanostructures at nanoscale Bratati Das and Kaori Sugihara Institute of Industrial Science, University of Tokyo, Japan Stimuli responsive soft-type two dimensional (2D) layered materials based on self-assembled nanostructures, for detection and visualization of mechanical stress, such as compression, tensile, and shear stresses, have attracted much interest in recent years as this secure a safer and healthy life [1] . Polydiacetylenes (PDAs) exhibit strong optical absorption and fluorescence properties upon exposure in different kind of mechanical stress [2] . PDA has potential to be used in a variety of sensing and imaging devices and biomedical applications (Fig. 1) [3] . Those potential applications are based on macroscopic study, the color change as a function of quantitative external forces at nanoscale, has been understudied.
Fig 1: Photograph of the measurement of (a) Writing pressure (b) strong i) andweak ii)
Fig 2: The quantitative force-fluorescence
correlation at Nanoscale.
Respiratory pressure by using a PDA coated paper. In 2021, Sugihara Group has demonstrated [4] the quantitative and anisotropic force-fluorescence correlation of PDA at nanoscale using the unique set up in the lab, the nano-friction force microscopy coupled with fluorescence microscopy (Fig. 2). With the advantage of the findings, we have tried to visualize and quantitively detect friction forces at nanoscale in soft layered materials composites of the diacetylene monomer crystal and interlayer organic components. The intercalation and dynamic natures of layered structures have different tunable stimuli responsive and sensing properties which will be useful to prepare nano-force sensor devices for biomedical
applications. References 1. B. Das, S. Jo, J.Zheng, J.Chen, K.Sugihara, Nanoscale, 2022, 14 (5), 1670-1678. 2. R. D.Ortuso, U.Cataldia, K. Sugihara, Soft Matter, 2017,13, 1728-1736. 3. M.Nakamitsu, K.Oyama, H. Imai, S. Fujii, Y. Oaki, Adv. Mater. 2021, 33, 2008755(1-9). 4. L.Juhasz, R.D. Ortuso, K. Sugihara, Nano Lett. 2021, 21, 543−549.
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© The Author(s), 2023
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