2D MXene–TiO2 Core–Shell Nanosheets as a Data-Storage Medium in Memory Devices

Benzheng Lyu, Yongsuk Choi, Hongyue Jing, Chuan Qian, Hyunseok Kang, Sungjoo Lee, Jeong Ho Cho

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


MXenes, an emerging class of 2D transition metal carbides and nitrides with the general formula Mn +1XnTx (n = 1–4), have potential for application as floating gates in memory devices because of their intrinsic properties of a 2D structure, high density-of-states, and high work function. In this study, a series of MXene–TiO2 core–shell nanosheets are synthesized by deterministic control of the surface oxidation of MXene. The floating gate (multilayer MXene) and tunneling layer (TiO2) in a nano-floating-gate transistor memory (NFGTM) device are prepared simultaneously by a facile, low-cost, and water-based process. The memory performance is optimized via adjustment of the thickness of the oxidation layer formed on the MXene surface. The fabricated MXene NFGTMs exhibit excellent nonvolatile memory characteristics, including a large memory window (>35.2 V), high programming/erasing current ratio (≈106), low off-current (<1 pA), long retention (>104 s), and cyclic endurance (300 cycles). Furthermore, synaptic functions, including the excitatory postsynaptic current/inhibitory postsynaptic current, paired-pulse facilitation, and synaptic plasticity (long-term potentiation/depression), are successfully emulated using the MXene NFGTMs. The successful control of MXene oxidation and its application to NFGTMs are expected to inspire the application of MXene as a data-storage medium in future memory devices.

Original languageEnglish
Article number1907633
JournalAdvanced Materials
Issue number17
Publication statusPublished - 2020 Apr 1

Bibliographical note

Funding Information:
This work was supported by a grant from the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2020R1A2C2007819) and the Creative Materials Discovery Program (NRF-2019M3D1A1078296) through the National Research Foundation (NRF) of Korea funded by the Ministry of Science and ICT.

Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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