Shape‐Deformable and Locomotive MXene (Ti3C2Tx)‐Encapsulated Magnetic Liquid Metal for 3D‐Motion‐Adaptive Synapses

Abstract Owing to their unique surface chemistry, room‐temperature pseudoliquidity, and high electrical conductivity, gallium‐based liquid metals (LMs) exhibit multifunctionality. To grant deformable and self‐flowing characteristics to LMs, magnetic particles are incorporated for precisely controlling the LM motion and shape deformability. However, LM surface‐adhesion and corrosivity hinders the integration of LMs into complex circuits and devices owing to potential alloying with other metals and contamination of their surroundings. In this study, a highly conductive Ti 3 C 2 T x (MXene)‐encapsulated magnetic LM (MX–MLM) is developed using a feasible fabrication method. The MX–MLM comprises magnetic particles suspended within its core and self‐assembled MXene flakes on the surface to maintain the nonwettability and high electrical conductivity of a liquid droplet. The noncorrosivity and increased magnetism of the MX–MLM enable nonstick magnetic‐field‐induced locomotion and shape deformation on various surfaces including metals, oxides, and polymers. Furthermore, the MX–MLM exhibits recyclability and magnetic‐field‐induced self‐healing. To demonstrate its functionality, the MX–MLM is employed as a magnetointeractive, shape‐deformable, and locomotive top gate electrode in a transistor fabricated using a ferroelectric polymer gate insulator. The device exhibits excellent magnetointeractive synaptic capability for detecting and learning 3D path information.