Improving oxidation stability of 2D MXenes: synthesis, storage media, and conditions

• Published in: Nano convergence Vol. 8; no. 1; p. 9
• Main Authors: Iqbal, Aamir, Hong, Junpyo, Ko, Tae Yun, Koo, Chong Min
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 16.03.2021; Springer Nature B.V; SpringerOpen; 나노기술연구협의회
• Subjects: Chemical etching; Chemical synthesis; Chemistry and Materials Science; Defect passivation; Degradation; Electromagnetic shielding; Energy storage; Flakes (defects); Industrial applications; Light emitting diodes; Materials Science; Mechanical properties; MXene; MXenes; Nanogenerators; Nanomaterials; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; Optoelectronics; Organic dispersion; Oxidation; Oxidation kinetics; Polymer composite; Polymer matrix composites; Reaction kinetics; Recent Research Trend on 2D Transition Metal Carbides or Carbonitrides MXene Nanomaterials; Review; Storage condition; 고분자공학; Organic dispersion; Defect passivation; Storage condition; Polymer composite; MXene; Oxidation kinetics; Two-dimensional (2D) nanomaterials; Chemical etching
• DOI: 10.1186/s40580-021-00259-6
• ISSN: 2196-5404

Understanding and preventing oxidative degradation of MXene suspensions is essential for fostering fundamental academic studies and facilitating widespread industrial applications. Owing to their outstanding electrical, electrochemical, optoelectronic, and mechanical properties, MXenes, an emerging class of two-dimensional (2D) nanomaterials, show promising state-of-the-art performances in various applications including electromagnetic interference (EMI) shielding, terahertz shielding, electrochemical energy storage, triboelectric nanogenerators, thermal heaters, light-emitting diodes (LEDs), optoelectronics, and sensors. However, MXene synthesis using harsh chemical etching causes many defects or vacancies on the surface of the synthesized MXene flakes. Defective sites are vulnerable to oxidative degradation reactions with water and/or oxygen, which deteriorate the intrinsic properties of MXenes. In this review, we demonstrate the nature of oxidative degradation of MXenes and highlight the recent advancements in controlling the oxidation kinetics of MXenes with several promising strategic approaches, including careful control of the quality of the parent MAX phase, chemical etching conditions, defect passivation, dispersion medium, storage conditions, and polymer composites.