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

Abstract

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.

An Overview of Recent Advances in the Synthesis and Applications of the Transition Metal Carbide Nanomaterials

“…The oxidation of multilayered MXene was controlled and it act as a floating gate and TiO 2 as a tunneling layer simultaneously by a facile water-based process in nano-floating-gate transistor memories (NFGTMs). The as-prepared NFGTMs showed good memory characteristics, including a large memory window, high programming, long retention time, and cyclic endurance [ 132 ].…”

MXene derivatives: synthesis and applications in energy convention and storage

“…According to previous reports, hybrid nanosheet structure has been fabricated by partial or complete oxidation of MXene. 53,81,82 The oxidation degree of the obtained MXene hybrid depends on the condition of the synthesis method. The controlled oxidation of Ti 3 C 2 T x MXene could be a promising method to prepare functional TiO 2 /MXene hybrids.…”

MXene‐ZnO Memristor for Multimodal In‐Sensor Computing

“…[27][28][29][30] On the contrary, a human perception system can sense and process different types of information with a complex environment and a small perceptive field simultaneously. [31][32][33][34][35][36][37][38][39] For example, the recognition accuracy of human eyes is strongly affected by the environment such as an extremely low or high RH condition. Thus, it is highly desirable to explore an intelligent device with light-and proton-dependent signal processing capabilities for mimicking the adaption behavior of the human eye under different environments.…”