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Flexible and wearable devices based on OECTs. (A) Flexible printed sensors for wearable and e-skin applications [17,137] (with permission from Springer Nature). (B) Paper-printed alcohol sensor [138] (with permission from Springer Nature). (C) OECT-based logic circuit: the message “ITN” is projected by electro-chromic properties [149] (with permission from John Wiley and Sons).
