Opto-Electrochemical Synaptic Memory in Supramolecularly Engineered Janus 2D MoS2 - Archive ouverte HAL
Article Dans Une Revue Advanced Materials Année : 2024

Opto-Electrochemical Synaptic Memory in Supramolecularly Engineered Janus 2D MoS2

Résumé

Artificial synapses combining multiple yet independent signal processing strategies in a single device are key enabler to achieve high-density of integration, energy efficiency, and fast data manipulation in brain-like computing. By taming functional complexity, the use of hybrids comprising multiple materials as active components in synaptic devices represents a powerful route to encode both short-term potentiation (STP) and long-term potentiation (LTP) in synaptic circuitries. To meet such a grand challenge, herein a novel Janus 2D material is developed by dressing asymmetrically the two surfaces of 2D molybdenum disulfide (MoS2) with an electrochemically-switchable ferrocene (Fc)/ ferrocenium (Fc+) redox couple and an optically-responsive photochromic azobenzene (Azo). Upon varying the magnitude of the electrochemical stimulus, it is possible to steer the transition between STP and LTP, thereby either triggering electrochemical doping of Fc/Fc+ pair on MoS2 or controlling an adsorption/desorption process of such redox species on MoS2. In addition, a lower magnitude LTP is recorded by activating the photoisomerization of azobenzene chemisorbed molecules and therefore modulating the dipole-induced doping of the 2D semiconductor. Significantly, the interplay of electrochemical and optical stimuli makes it possible to construct artificial synapses where LTP can be boosted to 4-bit (16 memory states) while simultaneously functioning as STP.
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Dates et versions

hal-04478869 , version 1 (26-02-2024)

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Ye Wang, Bin Han, Marcel Mayor, Paolo Samorì. Opto-Electrochemical Synaptic Memory in Supramolecularly Engineered Janus 2D MoS2. Advanced Materials, 2024, 36 (8), pp.2307359. ⟨10.1002/adma.202307359⟩. ⟨hal-04478869⟩
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