MoS2 nanosheets chemically modified with metal phthalocyanine via mussel-inspired chemistry for multifunctional memristive devices

Abstract

Memristive devices with in-memory computing functions have broad application prospects in the field of artificial intelligence. The development of memristive devices that integrate multi-functions of nonvolatile rewritable memory and biomimicking memristor activity requires the design and preparation of well-tailored memristive materials. In this contribution, MoS₂ nanosheets (MoS₂ NSs) were modified with polydopamine (PDA) through mussel-inspired chemistry, and then the metal phthalocyanine was covalently tethered onto their surface to form a two-dimensional MoS₂-PDA–tBu₄PcTiO nanomaterial with a sandwich structure. The fabricated electronic device with the Al/MoS₂-PDA–tBu₄PcTiO/ITO structure exhibits nonvolatile resistive memory characteristics in a large scanning voltage window and an ON/OFF current ratio of more than 10³. Interestingly, the device exhibits history-dependent memristive characteristics in a small scanning voltage window. The potentiation and depression, as well as the “learning–forgetting–relearning” processes of a biological synapse, have been successfully emulated in this biomimicking memristor. This work is expected to provide new insights into the development of multifunctional memristive devices.