Orthogonal Photochemistry toward Direct Encryption of a 3D‐Printed Hydrogel

作者：Di Chen, Chujun Ni, Chen Yang, Ye Li, Xin Wen, Curtis W. Frank, Tao Xie, Hua Ren, Qian Zhao · 发表于：Advanced Materials · 年份：2023 · DOI：10.1002/adma.202209956 · 被引用次数：45 · 研究领域：Photochromic and Fluorescence Chemistry、Luminescence and Fluorescent Materials、Polydiacetylene-based materials and applications

Encryption technologies are essential for information security and product anti-counterfeiting, but they are typically restricted to planar surfaces. Encryption on complex 3D objects offers great potential to further improve security. However, it is rarely achieved owing to the lack of encoding strategies for nonplanar surfaces. Here, an approach is reported to directly encrypt on a 3D-printed object employing orthogonal photochemistry. In this system, visible light photochemistry is used for 3D printing of a hydrogel, and ultraviolet light is subsequently employed to activate its geometrically complex surface through the dissociation of ortho-nitrobenzyl ester units in a spatioselective manner for information coding. This approach offers a new way for more reliable encryption, and the underlying orthogonal photochemistry can be extended toward functional modification of 3D-printed products beyond information protection.