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

Ho Yeon Kim, Kyuho Lee, Jin Woo Oh, Youngwoo Kim, Jung Eun Park, Jihye Jang, Seung Won Lee, Seokyeong Lee, Chong Min Koo, Cheolmin Park

Research output: Contribution to journalArticlepeer-review

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 Ti3C2Tx (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.

Original languageEnglish
JournalAdvanced Functional Materials
DOIs
Publication statusAccepted/In press - 2022
Externally publishedYes

Keywords

  • 3D motion adaptive synapses
  • MXene-encapsulated liquid metals
  • magnetointeractive locomotion and shape deformation
  • magnetoresponsive gate electrodes
  • nonvolatile ferroelectric polymer memory

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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