A Flexible and Biomimetic Olfactory Synapse with Gasotransmitter-Mediated Plasticity (Adv. Funct. Mater. 18/2023) |
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| Authors: | Yuping Deng Mingyou Zhao Yuan Ma Shangbin Liu Mingda Liu Boyu Shen Rongfeng Li He Ding Huanyu Cheng Xing Sheng Wangyang Fu Zehui Li Milin Zhang Lan Yin |
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| Affiliation: | 1. School of Materials Science and Engineering, The Key Laboratory of Advanced Materials of Ministry of Education, State Key Laboratory of New Ceramics and Fine Processing, Center for Flexible Electronics Technology, Tsinghua University, Beijing, 100084 China;2. College of Engineering, Peking University, Beijing, 100084 China;3. Department of Electronic Engineering, Tsinghua University, Beijing, 100084 China;4. Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA, 16802 USA;5. School of Materials Science and Engineering, Tsinghua University, Beijing, 100084 China;6. Beijing Institute of Collaborative Innovation, Beijing Siweizhigan Co., Ltd, Beijing, 100084 China;7. Beijing Engineering Research Center of Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing, 100084 China;8. Department of Electronic Engineering, Beijing National Research Center for Information Science and Technology, Institute for Precision Medicine, Center for Flexible Electronics Technology, and IDG/McGovern, Institute for Brain Research, Tsinghua University, Beijing, 100084 China;9. State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100084 China |
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| Abstract: | Neuromorphic electronics has demonstrated great promise in mimicking the sensory and memory functions of biological systems. However, synaptic devices with desirable sensitivity, selectivity, and operational voltage imitating the olfactory system have rarely been reported. Here, a flexible and biomimetic 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 a ppb-level response limit and desirable selectivity toward hydrogen sulfide (H2S) over other gases, and successfully achieves wireless real-time detection of excessive concentration of H2S from rotten eggs. H2S-mediated synaptic plasticity is accomplished with the device and typical synaptic behaviors are realized, including short-term memory (STM), long-term memory (LTM), transition from STM to LTM, etc., enabling the imitation of potential cumulative damages upon H2S exposure. The proposed device paves new ways toward next-generation olfactory systems capable of sensing and memorizing functionalities mimicking neurobiological systems, offering critical materials strategies to accomplish intelligent artificial sensory systems. |
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| Keywords: | biomimetic olfactory synapses gasotransmitter-mediated synaptic plasticity hydrogen sulfide sensing neuromorphic devices organic electrochemical transistors |
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