Advancements in Ti 3 C 2 T x MXene Stability: Synergistic Antioxidant Strategies and Their Impact on Long-Lasting Flexible Sensors

作者：Liming Yao, Liwei Qian, Wenqi Song, Sufeng Zhang, Yuhao Zhang, Lijing Zhang, Xikuan Li, Guangqi Yan, Valentin Nica · 发表于：ACS Applied Materials & Interfaces · 年份：2024 · DOI：10.1021/acsami.4c11281 · 被引用次数：21 · 研究领域：MXene and MAX Phase Materials、2D Materials and Applications、Advanced Memory and Neural Computing

Two-dimensional (2D) transition metal carbides (Ti 3 C 2 T x MXene) have demonstrated substantial application potential across various fields, owing to their excellent metallic conductivity and solution processability. However, the rapid oxidation of Ti 3 C 2 T x in aqueous environments, leading to a loss of stability within mere days, poses a significant obstacle for its practical applications. Herein, we introduce an antioxidant strategy that combines free radical scavenging with surface passivation, culminating in the design and synthesis of imidazolium-based ionic liquids (ILs) incorporating siloxane groups. By deploying a straightforward hydrolysis-addition reaction, we successfully fabricated IL-modified Ti 3 C 2 T x materials (Ti 3 C 2 T x -IL). The Ti 3 C 2 T x -IL not only displayed exceptional conductivity exceeding 3.85 × 10 4 S/m and hydrophilic contact angles below 45° but also showcased its superior chemical stability and antioxidation mechanisms through various analyses, including visual color change experiments, spectroscopic and energy spectrum characterization, free radical scavenging tests, and density-functional-theory-based molecular simulations. Furthermore, when utilized as a conductive filler in the fabrication of a poly(vinyl alcohol)/nanocellulose fiber (PVA/CNF) composite hydrogel (PCMIL), the resultant sensors exhibited remarkable mechanical performance with up to 535% strain, 1.59 MPa strength, 4.35 MJ/m 3 toughness, and a conductivity of 3.40 mS/...