Two-dimensional MXenes: From morphological to optical, electric, and magnetic properties and applications

Water treatment and environmental remediation applications of two-dimensional metal carbides (MXenes)

Graphene and MXene Nanomaterials: Toward High-Performance Electromagnetic Wave Absorption in Gigahertz Band Range

Electromagnetic (EM) pollution affecting people's normal lives and health has attracted considerable attention in the current society. In this work, a promising EM wave absorption and shielding material, MXene/Ni hybrid, composed of one-dimensional Ni nanochains and two-dimensional Ti3C2Tx nanosheets (MXene), is successfully designed and developed. As expected, excellent EM wave absorption and shielding properties are obtained and controlled by only adjusting the MXene content in the hybrid. A minimum reflection loss of -49.9 dB is obtained only with a thickness of 1.75 mm at 11.9 GHz when the MXene content is 10 wt %. Upon further increasing the MXene content to 50 wt %, the optimal EM shielding effectiveness (SE) reaches 66.4 dB with an absorption effectiveness (SEA) of 59.9 dB. Mechanism analysis reveals that the excellent EM wave absorption and shielding performances of the hybrid are contributed to the synergistic effect of conductive MXene and magnetic Ni chains, by which, the dielectric properties and electromagnetic loss can be easily controlled to obtain appropriate impedance matching conditions and good EM wave dissipation ability. This work provides a simple but effective route to develop MXene-based EM wave absorption and shielding materials. A universal guideline for designing the absorbing and shielding materials for the future is also proposed.

Promising Ti3C2Tx MXene/Ni Chain Hybrid with Excellent Electromagnetic Wave Absorption and Shielding Capacity.

Microcosmic 3D hierarchical structural design has proved to be an effective strategy to obtain high‐performance microwave absorbers, although the treatments to low‐dimensional cells in monolithic framework are usually based on semiempirical rules. In this work, a hierarchical carbon fiber (CF)@MXene@MoS2 (CMM) core‐sheath synergistic structure with tunable and efficient microwave absorption (MA) properties is fabricated by introducing self‐assembled Ti3C2Tx MXene on the surface of CF and subsequent anchoring of MoS2. By the synergistic effects from the MXene sheath increasing the conductive loss and MoS2 at the outermost layer improving the impedance matching, the MA performance of CMM can be effectively regulated and optimized: the optimal reflection loss is −61.51 dB with a thickness of 3.5 mm and the maximum effective absorption bandwidth covers the whole Ku‐band with 7.6 GHz at 2.1 mm. Meanwhile, the whole X‐band absorption can also be achieved with specific MoS2 loading at an optimized thickness.

Hierarchical Carbon Fiber@MXene@MoS2 Core-sheath Synergistic Microstructure for Tunable and Efficient Microwave Absorption

Sandwich-like MXene/Fe3O4 and C/TiO2/α-Fe two-dimensional (2D) nanocomposites were fabricated via in situ hydrothermal assembly of Fe3O4 nanoparticles on MXene nanosheets and postannealing. The as-prepared sandwich-like MXene/Fe3O4 nanocomposites contain uniformly distributed Fe3O4 nanoparticles between the interlayers of the 2D MXene Ti3C2T x nanoflakes. The redox reaction, Ti3C2T x + Fe3O4 → 3TiO2 + 2C + 3Fe, has also been reported for the first time to transform the binary MXene/Fe3O4 nanocomposites into ternary C/TiO2/α-Fe nanocomposites with the 2D structure maintained intact. Such a transition during postannealing gives rise to further enhanced electromagnetic wave absorption compared with that of the MXene/Fe3O4 nanocomposites on top of the already improved performance of the MXene/Fe3O4 compared with that of pristine MXene. The 2D C/TiO2/α-Fe nanocomposites exhibit effective absorption bandwidths of 3.3 and 3.5 GHz at thicknesses of 1 and 1.5 mm, respectively. This work offers a new route for fabricating novel electromagnetic wave absorbers, and the fine balance among lightweight, broad band, and small thickness of the C/TiO2/α-Fe nanocomposites makes them promising in the field of electromagnetic wave absorption.

Self-Assembled Sandwich-like MXene-Derived Nanocomposites for Enhanced Electromagnetic Wave Absorption.

Interplay of crystallization, stress relaxation and magnetic properties for FeCuNbSiB soft magnetic composites

Two-dimensional SnO/SnO2 heterojunctions for electromagnetic wave absorption

Developing lightweight and thin electromagnetic (EM) wave absorbers with a broad bandwidth remains a major challenge for reducing EM pollution originating from the rapidly increasing amount of electronics. Herein, porous Co9S8 nanotubes synthesized through a facile self-template method are applied as a single-component EM wave absorber. Based on percolation theory, an appropriate balance between excellent impedance matching and strong loss ability can be achieved for the Co9S8/paraffin composite with 30 wt% filler loading, giving rise to a broad effective absorption bandwidth almost covering the entire Ku band, or X band with varied Co9S8 loadings. This study provides a new concept for the design of single-component EM wave absorbing materials with even superior performance to those of many multicomponent absorbers.

Porous Co9S8 nanotubes with the percolation effect for lightweight and highly efficient electromagnetic wave absorption

Extra-wide bandwidth via complementary exchange resonance and dielectric polarization of sandwiched FeNi@SnO2 nanosheets for electromagnetic wave absorption

Huipeng Lv

Papers

Self-Assembled Sandwich-like MXene-Derived Nanocomposites for Enhanced Electromagnetic Wave Absorption.

Interplay of crystallization, stress relaxation and magnetic properties for FeCuNbSiB soft magnetic composites

Two-dimensional SnO/SnO2 heterojunctions for electromagnetic wave absorption

Porous Co9S8 nanotubes with the percolation effect for lightweight and highly efficient electromagnetic wave absorption

Extra-wide bandwidth via complementary exchange resonance and dielectric polarization of sandwiched FeNi@SnO2 nanosheets for electromagnetic wave absorption