Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.
School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China.
Small. 2023 Jun;19(24):e2300191. doi: 10.1002/smll.202300191. Epub 2023 Mar 15.
Utilization of rewritable luminescent materials for secure information storage and delivery has long been envisaged to reduce the cost and environmental wastes. However, it remains challenging to realize a temporally/spatially controlled display of the written information, which is crucial for secure information encryption. Here, inspired by bioelectricity-triggered skin pattern switching in cephalopods, an ideal rewritable system consisting of conductive graphene film and carbon dots (CDs) gel with blue-to-red fluorescence-color changes via water-triggered CDs aggregation and re-dispersion is presented. Its rewritability is guaranteed by using water ink to write on the CDs-gel and employing Joule heat of graphene film to evaporate water. Due to the highly controlled electrical stimulus, temporally/spatially controlled display is achieved, enabling on-demand delivery and duration time regulation of the written information. Furthermore, new-concept environment-interactive rewritable system is obtained by integrating sensitive acoustic/optical sensors and multichannel electronic time-delay devices. This work opens unprecedented avenues of rewritable systems and expands potential uses for information encryption/delivery.
可重写发光材料在信息存储和传递方面的应用，长期以来一直被认为可以降低成本和减少环境浪费。然而，实现对所写信息的时间/空间控制显示仍然具有挑战性，这对于安全信息加密至关重要。受头足类动物生物电触发皮肤图案切换的启发，本文提出了一种理想的可重写系统，该系统由导电石墨烯薄膜和碳点（CDs）凝胶组成，通过水触发 CDs 聚集和再分散，实现了从蓝色到红色的荧光颜色变化。通过使用水基油墨在 CDs-凝胶上书写，并利用石墨烯薄膜的焦耳热蒸发水，保证了其可重写性。由于采用了高度可控的电刺激，实现了时间/空间控制显示，从而能够按需传递和调节所写信息的持续时间。此外，通过集成敏感的声/光传感器和多通道电子时滞装置，获得了新概念的环境交互式可重写系统。这项工作为可重写系统开辟了前所未有的途径，并扩展了信息加密/传递的潜在用途。
