A Flexible and Biomimetic Olfactory Synapse with Gasotransmitter-Mediated Plasticity

摘要

Neuromorphic electronics has demonstrated great promise in mimickingthe sensory and memory functions of biological systems. However, synapticdevices with desirable sensitivity, selectivity, and operational voltage imitatingthe olfactory system have rarely been reported. Here, a flexible andbiomimetic olfactory synapse based on an organic electrochemical transistor(OECT) coupled with a breath-figure derived porous solid polymer electrolyte(SPE) is proposed. The device demonstrates excellent sensitivity with appb-level response limit and desirable selectivity toward hydrogen sulfide(H_2S) over other gases, and successfully achieves wireless real-time detectionof excessive concentration of H_2S from rotten eggs. H_2S-mediated synapticplasticity is accomplished with the device and typical synaptic behaviorsare realized, including short-term memory (STM), long-term memory (LTM),transition from STM to LTM, etc., enabling the imitation of potential cumulativedamages upon H_2S exposure. The proposed device paves new waystoward next-generation olfactory systems capable of sensing and memorizingfunctionalities mimicking neurobiological systems, offering critical materialsstrategies to accomplish intelligent artificial sensory systems.