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. 2020 Jul 22;6(30):eabb5769. doi: 10.1126/sciadv.abb5769

Fig. 4. Printable and rewritable SCs on IHN BCP PC.

Fig. 4

(A) Schematic of inkjet printing on IHN BCP PC film with ionic liquid (IL) ink. (B) Photograph of an IL ink-printed IHN BCP PC film with different concentrations. (C) Computer-processed image of the part of a one dollar bill in black and white contrast. (D) Photograph of the SC image printed by adjusting the concentration of the IL ink based on the contrast image in (C). (E) Optical microscope image of lines printed with IL on an IHN BCP PC film, which shows a resolution of the SC lines of approximately 50 μm. Photographs of IL ink-printed SC images of IHN BCP PCs on (F) a conventional paper and (G) glass substrate. (H) Photograph of an IL inkjet-printed image of an IHN BCP PC film arising from multiorder reflection SCs in visible range. (I) UV-vis spectra of an IHN BCP PC film printed with IL (red), followed by the removal of the IL by a neat PEGDA pad (black). (J) Maximum reflection wavelength values with repetitive IL writing and erasing processes. (K) Photographs of different IHN BCP SC images with repetitive printing and erasing of IL ink. An IHN BCP SC image (step 1) inkjet-printed with IL on an IHN BCP PC film, followed by removal of IL with a neat PEGDA pad. The printing and erasing process is repeatable (steps 2 and 3). Photo credit: H.S.K., Yonsei University.