Reversible Writing/Re-Writing Polymeric Paper in Multiple Environments

Compared with traditional paper relying on cellulose, the polymeric paper written by light can satisfy more multi-environmental stability and reusability for sustainable development. Herein, proposed for the first time, a novel multifunctional polymeric paper with a patch-sewing structure is designed, presenting the reversible writing/re-writing performance. Meanwhile, a series of Fe-based oxides with various submicron structures inherited from metal-organic framework templates are reported, in which the optimum one exhibited 95.04% absorbance from the finite difference time domain simulation and realized photothermal conversion instantaneously (soaring to 300 degrees C within 38 s). Given the distinguished mechanical properties (the tensile strength of 21.34 MPa and elongation at break of 546.06%), shape-memory ability, and multi-environmental stability, the composites are perfect for information recording. Due to the addition of the liquid crystal phase serving as the ink on the paper, the stress concentration and destruction can be recorded on the surface while it can recover to the initial situation by near-infrared irradiation. Moreover, the remote writing with precision triggered by a focused light source can be achieved in multiple situations (air, water, and ice), which paved the way for the next generation of paper, especially in extreme conditions like deep-water or aerospace.