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Self-Sustained Programmable Hygroelectronic Interfaces In article number 2208081, Yaoxin Zhang, John Wang, Swee Ching Tan, and co-workers report an intelligent and programmable moisture-driven energy generating platform for humidity-regulated information encryption and display. This is enabled by asymmetric coating of ionic hygroscopic hydrogels on a carbon black nano-surface. Further tuning the hydrogel's deliquescence to relative humidity, the device is able to conceal and reveal information hierarchically in various relative humidity ranges.
Zhang et al. (Fri,) studied this question.