Advanced Ti₃C₂T_x MXene‐modified cement nanocomposites toward high efficiency electromagnetic functional materials for green buildings

Abstract

The proliferation of electronic devices and wireless communication is leading to serious electromagnetic (EM) interference. In this work, Ti 3 C 2 /cement composites were developed as high efficiency EM functional materials by introducing exfoliated Ti 3 C 2 T x MXene with cement for green buildings with EM shielding function. In the composites, few-layered Ti 3 C 2 MXene were dispersed homogeneously throughout the cement matrix. The EM properties of the composites were studied as a function of the MXene content. With increasing MXene content, real and imaginary part of permittivity was significantly improved owing to the polarization and electrical conduction caused by the MXene phase. Composites with 15 wt.% MXene showed good EM absorbing properties with a maximum effective absorbing bandwidth of 2.67 GHz. Strong EM shielding can be achieved when MXene content increased to 25 wt.%. The EM shielding effectiveness of such composites was higher than 22.0 dB, and the dominating shielding mechanism was EM absorption. This work finds new materials for the development of advanced green buildings with EM shielding function.

Synthesis of new rare earth containing MAX phases Sc2AC (A = Ga, In) by spark plasma sintering

“…Barsoum and Yury Gogotsi et al 5 . found that acid could be used to selectively etch the A element layer from MAX phases to produce a new type of 2D material called “MXene.” Due to their unique structures and properties, as well as their simple preparation methods, MXenes are considered to have wide application prospects in the energy storage, catalysis, and biomedical engineering 6–11 …”

“…Due to their unique structures and properties, as well as their simple preparation methods, MXenes are considered to have wide application prospects in the energy storage, catalysis, and biomedical engineering. [6][7][8][9][10][11] With the deepening of research, the elemental composition of MAX phases gradually expands, including the discovery in recent years of Sc as the M element, Se and Te as the A element, and B as the X element. [12][13][14][15] The research on the above-mentioned new A and X elements is currently relatively complete, while Sc as an M element is still in its early stage, and most researches on scandium-containing MAX phases and MXenes are still the theoretical predictions.…”