材料科学
加密
离子键合
自愈水凝胶
纳米技术
水分
湿度
计算机科学
离子
复合材料
气象学
量子力学
操作系统
物理
高分子化学
作者
Yaoxin Zhang,Zhen Yu,Hao Qu,Shuai Guo,Jiachen Yang,Songlin Zhang,Lin Yang,Shaoan Cheng,John Wang,Swee Ching Tan
标识
DOI:10.1002/adma.202208081
摘要
Abstract The emerging moisture‐driven energy generation (MEG) technology opens up new possibilities for humidity‐responsive materials, devices, and interdisciplinary opportunities in fields like information security. However, such potential remains untapped. Here, an original MEG structure with a hygroionic energy‐conversion route by selective coating of ionic hygroscopic hydrogels on a carbon black surface is reported. The hygroionic route features a process in which the scavenged energy is stored in the electrical double layers formed at the interfaces between the ionic hydrogel and the carbon nanoparticles. The resultant electrical field developed across the hydrogel‐coated wet carbon and the rest of the dry carbon area is thus durably lasted. Based on this unique structure, hygroelectronic information interfaces (HEII) for humidity‐regulated information encryption and display are put forward by devising hydrogel patterns on a carbon platform. Further by tuning the hygroscopicity of the ionic hydrogels and incorporating encoding methods (e.g., Morse code), it is demonstrated that the HEII platform is programmable to carry different information in certain humidity ranges. Unlike those conventional anti‐counterfeiting methods that optically reveal the hidden information once the required stimulus is provided, the new HEII serves as a hierarchical solution for high‐security encryption and display.
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