MXene/Polylactic Acid Fabric-Based Resonant Cavity for Realizing Simultaneous High-Performance Electromagnetic Interference (EMI) Shielding and Efficient Energy Harvesting

Abstract

Proliferation in telecommunications and integrated/ intelligent devices entails an intense concern for electromagnetic interference (EMI) shielding and versatility. It remains an activated passion to launch infusive EMI shielding materials integrated with self-powered peculiarities. Herein, a double-layered MXene/polylactic acid (PLA) fabric resonance cavity (D-MPF-RC) comprised of two MXene/PLA fabrics (MPFs) with alternating MXene and PLA structures that are separated by a poly(tetrafluoroethylene) (PTFE) frame is developed. The D-MPF-RC achieved 48.5 and 74.8% improvement in SE T and SE A , and 24.6% reduction in SE R by introducing the double-layered structure and increasing the resonance cavity (RC) distance without varying the material composition and cost. A high shielding efficiency (SE) of 92.3 dB was obtained at an RC distance of 6 mm owing to the synergetic effects of multiple reflections and destructive EM wave interference. The tribopolarity difference between PLA and MXene and the RC structure made the D-MPF-RC a readily available triboelectric nanogenerator (TENG) that could convert mechanical energy into electricity. The D-MPF-RC TENG demonstrated an open-circuit voltage of 88 V and achieved a peak power density of 35.4 mW m −2 on a 6.6 MΩ external resistor, which made it possible to charge capacitors and serve as a self-powered tactile sensor. This report offers new insights into the design of high-performance EMI shielding shields with a resonance cavity and proposes a feasible pathway to integrate them with energy harvesting capabilities.

High-performance EMI shielding effectiveness of Fe3O4–3D rPC nanocomposites: a systematic optimization in the X-band region

“…The presence of C–C and C–O–C bands enhanced the electrical conductivity as these are stronger electron donors. 43 The chemical interaction between Fe, O, and C was confirmed by the presence of the peaks corresponding to the Fe–O–C (531.96 eV), C–O (533.43 eV), and Fe–O (530.52 eV) bonds in the O 1s spectrum, and hence it can be deduced that the electronegative O atoms act as the bridge connecting Fe and C atoms and thus aid in chemical interactions between Fe and C elements, and the results agree with those of the Raman spectrum. 44 The Fe 2p core spectrum showed two distinct regions of 713.7, 725.14 eV (Fe 2+ ) and 713.7, 728.1 eV (Fe 3+ ) corresponding to the Fe 2p 3/2 and Fe 2p 1/2 spin orbitals, respectively.…”

The performance of and promotion strategies for degradable polymers in triboelectric nanogenerators

“…Nevertheless, the decomposition reaction must be carried out completely and rapidly in special circumstances, such as in acidic or alkaline solutions. Cellulose 176 and PLA 103 are distinctive representatives with extraordinary generating properties for TENGs and excellent mechanical and decomposition characteristics. There is a dire need for more degradable polymers to be developed.…”

Recent Advances in MXene-Based Fibers, Yarns, and Fabrics for Wearable Energy Storage Devices Applications

“…In addition, MXene material is also widely used in biology, , medicine, , electromagnetic shielding, , sensing, , temperature regulation, , human health monitoring, − and other fields. MXene-based fibers/fabrics not only are used to make single-function textiles but also can be prepared as multifunctional textiles, which can simultaneously have functions such as heating, energy storage, electromagnetic shielding, and sensing. − This multifunctional textile has an excellent prospect.…”