Functional Tailoring of Multi‐Dimensional Pure MXene Nanostructures for Significantly Accelerated Electromagnetic Wave Absorption

Abstract

Transition metal carbide (Ti3C2Tx MXene), with a large specific surface area and abundant surface functional groups, is a promising candidate in the family of electromagnetic wave (EMW) absorption. However, the high conductivity of MXene limits its EMW absorption ability, so it remains a challenge to obtain outstanding EMW attenuation ability in pure MXene. Herein, by integrating HF etching, KOH shearing, and high‐temperature molten salt strategies, layered MXene (L‐MXene), network‐like MXene nanoribbons (N‐MXene NRs), porous MXene monolayer (P‐MXene ML), and porous MXene layer (P‐MXene L) are rationally constructed with favorable microstructures and surface states for EMW absorption. HF, KOH, and KCl/LiCl are used to functionalize MXene to tune its microstructure and surface state (F−, OH−, and Cl− terminals), thereby improving the EMW absorption capacity of MXene‐based nanostructures. Impressively, with the unique structure, proper electrical conductivity, large specific surface area, and abundant porous defects, MXene‐based nanostructures achieve good impedance matching, dipole polarization, and conduction loss, thus inheriting excellent EMW absorption performance. Consequently, L‐MXene, N‐MXene NRs, P‐MXene ML, and P‐MXene L enable a reflection loss (RL) value of −43.14, −63.01, −60.45, and −56.50 dB with a matching thickness of 0.95, 1.51, 3.83, and 4.65 mm, respectively.

Unveiling the potential of Ti3C2Tx MXene for gas sensing: recent developments and future perspectives

“…68 In addition to its superior conductivity, the most well-liked Ti 3 C 2 T x MXene also has a large surface area and an abundance of surface functional groups. 69…”

TiO2 Nanosheets/Ti3C2Tx MXene 2D/2D Composites for Excellent Microwave Absorption

“…The rapid development of electronic equipment and communication technology has brought convenience to people’s life, while electromagnetic wave (EMW) pollution has adversely affected people’s health. − At the same time, the stealth technology urgently needs to reduce the radar cross section (RCS) by efficient microwave absorption materials. , Two-dimensional (2D) materials are considered as promising materials that can achieve high absorption, broad band, lightweight, and thin thickness because the 2D-layered structure exhibits special physical and chemical properties. , Ti 3 C 2 T x MXene is a new 2D material, which has attracted great attention in new energy, , electronics, and microwave absorption − due to the high conductivity, large surface area, and rich surface groups.…”

Porous Carbonaceous Aerogels Composed of Multiscale Carbon-Based Units for High-Performance Microwave Absorption

“…Recently, Che and colleagues skillfully fabricated diversiform multidimensional pure MXene nanostructures by employing a serious of functional strategies. The obtained samples possess favorable microstructures and surface states for efficient EMW absorption . Zhang and coworkers constructed NiSe 2 –FeSe@NC double-shell hollow nanorods based on the methods of structure promotion and component recombination .…”

“…The obtained samples possess favorable microstructures and surface states for efficient EMW absorption. 11 Zhang and coworkers constructed NiSe 2 −FeSe@ NC double-shell hollow nanorods based on the methods of structure promotion and component recombination. 12 The enhanced loss capability and impedance matching offer an excellent EMW absorption performance.…”