Guar Gum-WTe₂ Nanohybrid-Based Biomemristor Synapse With Short- and Long-Term Plasticity

In this letter, we report a novel biomemristor synapse based on renewable guar gum biopolymers that can dissolve in water easily and obtain a uniform and compact resistive switching layer via spin-coating process. Incorporating with well-dispersed tungsten telluride (WTe2) nanosheets exfoliated by natural tannic acid, the fabricated Ag/guar gum-WTe2 nanohybrid/Au biomemristor exhibits a forming-free volatile switching characteristic with low operation voltage (< 0.3 V) and robust uniformity. The device can mimic bio-synaptic functionalities for both short- and long-term plasticity, including excitatory postsynaptic current, paired-pulse facilitation, the transition from short-term plasticity to long-term potentiation, and the forgetting behavior modulation by pulse frequency. The guar gum-WTe2 nanohybrid-based biomemristor paves a promising way to develop biocompatible and environment sustainable artificial synapses for neuromorphic systems.