Key Takeaways & Executive Findings
- •• Aramid nanofiber/MXene-reinforced polyelectrolyte hydrogels achieve absorption-dominated EMI shielding while maintaining relatively high conductivity, overcoming the classical impedance matching trade-off. • The hydration effect of hydrophilic polar groups induces intermediate water formation, enhancing polarization relaxation and rearrangement under electromagnetic fields, significantly boosting EMI shielding effectiveness. • The hydrogels exhibit outstanding mechanical performance, exceptional adhesion strength, and reliable strain-sensing capability for monitoring human motions, demonstrating multifunctional potential. • Electromagnetic wave attenuation was evaluated across X-band and terahertz frequencies, with performance varying by water content state (hydrated, dried, frozen), offering tunable shielding properties.
Abstract
Conductive hydrogels have garnered widespread attention as a versatile class of flexible electronics. Despite considerable advancements, current methodologies struggle to reconcile the fundamental trade-off between high conductivity and effective absorption-dominated electromagnetic interference (EMI) shielding, as dictated by classical impedance matching theory. This study addresses these limitations by introducing a novel synthesis of aramid nanofiber/MXene-reinforced polyelectrolyte hydrogels. Leveraging the unique properties of polyelectrolytes, this innovative approach enhances ionic conductivity and exploits the hydration effect of hydrophilic polar groups to induce the formation of intermediate water. This critical innovation facilitates polarization relaxation and rearrangement in response to electromagnetic fields, thereby significantly enhancing the EMI shielding effectiveness of hydrogels. The electromagnetic wave attenuation capacity of these hydrogels was thoroughly evaluated across both X-band and terahertz band frequencies, with further investigation into the impact of varying water content states—hydrated, dried, and frozen—on their electromagnetic properties. Moreover, the hydrogels exhibited promising capabilities beyond mere EMI shielding; they also served effectively as strain sensors for monitoring human motions, indicating their potential applicability in wearable electronics. This work provides a new approach to designing multifunctional hydrogels, advancing the integration of flexible, multifunctional materials in modern electronics, with potential applications in both EMI shielding and wearable technology.
1. Introduction
Since entering the new century, humanity has been dedicated to technological innovation in various fields. Among them, electronic technologies and products have lent significant momentum to the advancement of current science and technology [1–5]. Driven by the endless revolution of flexible electronics, recent years have witnessed a spurt progress in the fields of flexible displays [6], flexible batteries [7, 8], intelligent electronic skins [9–11], soft robots [12–14] and, etc. Traditional rigid electronics are being gradually replaced by flexible electronics due to the commensurate softness with human issues, conforming contact with substrate surface and long-term wearability of the latter [15–17]. From the perspective of materials designing, polymer hydrogels can achieve basic flexibility, biocompatibility as well as functionality such as energy storage and sensing in an exquisite manner of engineering [18–21].
The electromagnetic radiation generated by densely distributed electronics will interfere with other surrounding equipment, triggering performance degradation or even operation malfunction [22]. For this reason, it is of a desperate need to develop multifunctional flexible electronics with excellent electromagnetic interference (EMI) shielding performance. As an important component material of flexible electronics, hydrogels have been proved to effectively attenuate electromagnetic waves (EMWs) through multiple reflections and scatterings caused by porous structure, conductive loss of filling networks as well as polarization loss of water and other substances with polar groups [23–26]. The main mechanism of EMI shielding includes reflections on the surfaces of shielding architectures along with inner absorption and multiple reflections. Only a small proportion of EMWs penetrate shielding materials and then continue to propagate. The addition of conductive fillers and the enhancement of the electrical conductivity of hydrogels are crucial means for achieving high-performance hydrogel-based EMI shielding materials. A substantial amount of research work has demonstrated the feasibility of constructing conductive networks with conductive fillers to attenuate EMWs. For instance, Mei et al. [27] enhanced the energy dissipation of EMWs by increasing the content of MXene to simultaneously construct conductive pathways and improve the conductivity of the hydrogel matrix; Li et al. [28] improved the conductivity ...
Loading authentic research manuscript (Pages 1–5)...
Jinglun Guo, Tianyi Zhang, Xiaoyu Hao, Shuaijie Liu, Yuxin Zou, Jinjin Li, Wei Wu, Liming Chen, Xuqing Liu (2025). Aramid Nanofiber/MXene-Reinforced Polyelectrolyte Hydrogels for Absorption-Dominated Electromagnetic Interference Shielding and Wearable Sensing. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01791-4
Research & Educational Purpose Only:The translations, structured abstracts, analytical annotations, and data reports provided by SinoTechIntel are intended exclusively for academic research, internal corporate R&D, and educational benchmarking. They do not constitute formal engineering, chemical safety, legal, or professional advice.
Copyright & Intellectual Property Notice: Original copyright of the underlying source articles and experimental data remains with the respective authors, institutions, and original publishing journals. SinoTechIntel claims intellectual property only over its proprietary translations, analytical syntheses, and AEO structured enhancements in accordance with international fair use and academic citation principles.
Frequently Asked Questions
What is the main challenge addressed by this research?
The main challenge is reconciling the trade-off between high conductivity and effective absorption-dominated electromagnetic interference (EMI) shielding in conductive hydrogels, as dictated by classical impedance matching theory.
How do the hydrogels achieve absorption-dominated EMI shielding?
The hydrogels leverage polyelectrolyte properties to enhance ionic conductivity and exploit the hydration effect of hydrophilic polar groups to induce intermediate water formation, which facilitates polarization relaxation and rearrangement under electromagnetic fields, thereby enhancing absorption.
What are the key performance attributes of the developed hydrogels?
The hydrogels exhibit outstanding mechanical performance, exceptional adhesion strength, excellent EMI shielding effectiveness across X-band and terahertz frequencies, and reliable strain-sensing capability for monitoring human motions.
In which frequency bands was the EMI shielding evaluated?
The electromagnetic wave attenuation capacity was evaluated across both X-band (8-12 GHz) and terahertz band frequencies.
What potential applications do these hydrogels have?
The hydrogels are suitable for applications in EMI shielding and wearable electronics, particularly as strain sensors for monitoring human motions.
Related Technical Papers & Translations
Direct Repair of the Crystal Structure and Coating Surface of Spent LiFePO4 Materials Enables Superfast Li-Ion Migration
The rapid accumulation of spent LiFePO4 (LFP) cathodes from retired lithium-ion batteries necessitates the development of effective and environmental-friendly recycling strategies. In this context, direct regeneration has emerged as a promising approach for reclaiming LFP cathode materials, offering a streamlined pathway to restore their electrochemical functionality. We report an integrated regeneration protocol that simultaneously repairs the degraded crystal structure and reconstructs the damaged carbon coating in spent LFP. The regenerated cathode material had superfast lithium-ion diffusion kinetics and a stable cathode–electrolyte interface, giving a remarkable rate capability with specific capacities of 122 mAh g−1 at 5C and 106 mAh g−1 at 10C (1C = 170 mA g−1). It also maintained capacities of 110.7 mAh g−1 (5C) and 84.1 mAh g−1 (10C) after 400 cycles. It could be used in harsh environments and could be stably cycled at subzero temperatures (−10 and −20 °C) and in solid-state electrolyte batteries. Life cycle assessment combined with economic evaluation using the EverBatt model reveals that this direct regeneration approach has high economic and environmental benefits.
Oxide Semiconductor for Advanced Memory Architectures: Atomic Layer Deposition, Key Requirement and Challenges
Oxide semiconductors (OSs), introduced by the Hosono group in the early 2000s, have evolved from display backplane materials to promising candidates for advanced memory and logic devices. The exceptionally low leakage current of OSs and compatibility with three-dimensional (3D) architectures have recently sparked renewed interest in their use in semiconductor applications. This review begins by exploring the unique material properties of OSs, which fundamentally originate from their distinct electronic band structure. Subsequently, we focus on atomic layer deposition (ALD), a core technique for growing excellent OS films, covering both basic and advanced processes compatible with 3D scaling. The basic surface reaction mechanisms—adsorption and reaction—and their roles in film growth are introduced. Furthermore, material design strategies, such as cation selection, crystallinity control, anion doping, and heterostructure engineering, are discussed. We also highlight challenges in memory applications, including contact resistance, hydrogen instability, and lack of p-type materials, and discuss the feasibility of ALD-grown OSs as potential solutions. Lastly, we provide an outlook on the role of ALD-grown OSs in memory technologies. This review bridges material fundamentals and device-level requirements, offering a comprehensive perspective on the potential of ALD-driven OSs for next-generation semiconductor memory devices.
Laser powder bed fusion of biodegradable Zn-4Cu alloy: Processing, microstructure and properties
Zn's natural degradability and biocompatibility make it a promising candidate for implants, however, its mechanical properties remain insufficient for bone applications. In this study, the performance of Zn was enhanced by developing Zn-Cu alloys via laser powder bed fusion (LPBF). Optimal LPBF parameters for forming stable tracks were achieved by adjusting laser power and scanning speed. Under optimized conditions of 100 W and 100 mm/s, high-density (99.58%) Zn-Cu alloys with improved hardness (68.2HV) and yield strength (160 MPa) were achieved. These improvements are attributed to solid solution strengthening, segregation strengthening, and grain refinement. The Zn-Cu alloys also demonstrated favorable degradation behavior, with a rate of 0.16 mm/year. This degradation is primarily driven by micro-galvanic corrosion between the CuZn5 phase and Zn matrix, along with refined grains and increased grain boundary density. This work demonstrates a viable strategy for fabricating Zn-based implants with enhanced structural integrity and mechanical performance via LPBF.