@article{Han2026, 
author = {Yaqun Han and Jingyuan Hu and Jiaming Huyan and Hao Zong and Shufen Zhang and Suli Wu},
title = {Large-area free-standing photonic crystal films with robust iridescent and reusability based on porous paper-based media},
year = {2026},
journal = {Nano Research},
volume = {19},
number = {1},
pages = {94908209},
keywords = {structural color, photonic crystals, reusability, free-standing film, excellent color stability},
url = {https://www.sciopen.com/article/10.26599/NR.2025.94908209},
doi = {10.26599/NR.2025.94908209},
abstract = {Large-area and free-standing photonic crystal (PC) polymer films exhibit highly saturated iridescence and robust structural colors, making them promising for applications in the field of display, anti-counterfeiting, and camouflage. However, their practical utilization has been hindered by challenges in achieving both vivid coloration and reusability. Here, we design a sandwich-structured PC film that simultaneously addresses issues of color appearance and reusability by combining colloid evaporative self-assembly on porous substrate and knife coating of polymers. The unique “sandwich” structure, comprising a self-assembled PC intermediate layer and protective polymer encapsulation, demonstrates a great synergistic effect (“1 + 1 > 2”), including unprecedented color fastness stability (affordable for 100 times dye/wet fastness), bright iridescent color, and certain flexibility and reusability. In addition, by replacing the bottom polymer with a double-sided adhesive, a flexible PC sticker can be further obtained, broadening its range of applications to surfaces of different materials. This strategy opens a new avenue for constructing functionalized iridescent PC-polymer films.}
}