Wrinkled Titanium Carbide (MXene) with Surface Charge Polarizations through Chemical Etching for Superior Electromagnetic Interference Shielding

Abstract

Despite the fact that the high conductivity of two-dimensional laminated transition metal carbides/ nitrides (MXenes) contributes to the outstanding electromagnetic interference (EMI) shielding by the reflection of electromagnetic waves (EWs), it is difficulty to improve EMI shielding by pursuing higher conductivity due to the limitation of intrinsic properties. Here, we achieve superior EMI shielding by introducing the absorption of EWs in MXenes with micro-sized wrinkles which are induced by abundant Ti vacancies under chemical etching. The shielding effectiveness is up to 107 dB at a thickness of 20 μm. Combining with atomicscale structure observation and the first-principles calculations, it is concluded that the promotion of EMI shielding originates from the resonant absorption of formed electric dipoles induced by the asymmetrical distribution of charge densities near Ti vacancies. Our results could open a new vista for developing twodimensional EMI shielding materials.

Structural design and preparation of Ti3C2TxMXene/polymer composites for absorption-dominated electromagnetic interference shielding

“…5c ). By etching 2D MXene nanoribbons with sulfuric acid, Ying et al 96 created defects or dislocations in the MXene nanoribbons. As the density of defects and dislocations increased, the internal tension within the MXene film increased, resulting in the formation of natural wrinkles.…”

Electromagnetic Wave Absorption and Shielding Performances and Mechanisms of a Porous Ti3AlC2/SiC Gradient Composite

“…In recent years, ternary layered MAX phases with the combination of performances of metals and ceramics have received wide attention in electromagnetic wave absorption and shielding fields. − Due to good conductivity, excellent mechanical properties, and oxidation resistance, these MAX phases have become promising reinforcers to improve the conductivity and mechanical properties of composite materials . Especially, Ti 3 SiC 2 and Ti 3 AlC 2 , the two most typical MAX phases, exhibit good performance in EMW absorbing and shielding.…”

Significantly Enhanced Electromagnetic Interference Shielding Performances of Epoxy Nanocomposites with Long-Range Aligned Lamellar Structures

“…The commonly used conductive fillers are metal, conductive polymers and inorganic nonmetallic materials [10,11]. Among them, inorganic nonmetallic materials such as the graphite [12], carbon nanotubes (CNT) [13,14], graphene [15][16][17] and MXene [18][19][20] are currently the focus of most attention, due to their advantages of high specific strength, low density, superior electrical conductivity (σ) and easy processing, etc. Herein, Ti 3 C 2 T x has been widely applied in the field of EMI shielding due to mature preparation technology and superior σ value [21][22][23].…”