Gogotsi (the father of the new two-dimensional material MXene) has been committed to the preparation of high-performance silicon-based two-dimensional materials by SiC etching until 2011, and has always expected the two-dimensionalization of the layered material MAX phase ceramics. As a result, the MAX phase was developed in 2011 In the application of the material's lithium battery positive electrode, his student Nguib accidentally obtained MXene, which is a young two-dimensional material, by etching HF Ti3AlC2, where "MX" refers to its origin from MAX ceramic (where the elements of layer A are etched away) , "Exe" means that it has a graphene-like nanosheet structure. MXene has near-metal conductivity (reported as high as 9880S / cm), and at the same time combines excellent hydrophilicity, which overcomes the defect that graphene is seriously lost of conductivity once it is oxidized or surface modified, so MXene is subjected to Researchers from various countries enthusiastically "pursue".
Compounding MXene with polymers is one of the important research hotspots. Researcher Yu Jinhong of Ningbo Institute of Materials, Chinese Academy of Sciences and Associate Professor Chen Xiaoyong of North University of China systematically summarized the research in the field of polymer nanocomposites since the discovery of MXene. On "Polymer Reviews".
After a brief summary of the performance and preparation of MXene, the authors introduced the preparation technology and main route of MXene / polymer composite materials, and found that the current wet mechanical mixing and in-situ polymerization are the main methods of preparing polymer / MXene nanocomposites After MXene is added to the polymer, it can significantly improve the performance of the polymer in terms of force, heat and electricity. For example, MXene / PVA can stably support a weight that exceeds 15,000 times its own weight; adding 0.15% MXene can make the wave transparent PVA has an electromagnetic shielding efficiency of up to 28dB; adding 1.7% of MXene can improve the conductivity of PAM by several orders of magnitude.
In the last part of the paper, the authors focused on the application of the composite material in biomedicine, sensing, electromagnetic shielding and energy. This article shows that MXene / polymer composite materials have excellent light-heat, sterilization and temperature-sensitive characteristics, and have significant effects in the field of tumor heat killing and antibacterial. MXene / polymer composite materials are also widely reported in the field of flexible sensing. They can be very sensitive to environmental and human physiological indicators such as pressure, temperature, VOC and humidity. The sensing pressure can be as low as 1Pa and the number of cycles can be up to tens of thousands of times. . In the energy field, MXene / polymer composite materials can be used in multiple energy-related links such as conversion, adsorption, and storage, especially in supercapacitors, with extremely high volume density. Due to the high electrical conductivity and hierarchical structure, MXene / polymer composite materials have the most outstanding work in electromagnetic shielding and adsorption. In the 45um thick MXene / sodium alginate system, the electromagnetic shielding efficiency is as high as 92dB, which is the highest among synthetic materials. The electromagnetic shielding material is far superior to the electromagnetic shielding performance of silver and copper.
This review is of great significance for understanding the physical and chemical properties of MXene / polymer nanocomposites, overviewing related research, and clarifying key directions in the field, major bottlenecks, and future developments.