Key Takeaways & Executive Findings
- •• • Gauge factor (GF) reaches 5.8 × 10^4 with a sensing range up to 535% strain and a detection limit of 0.15% strain, enabling full-range detection of human motion from subtle physiological signals to large joint movements; this addresses the trade-off between sensitivity and stretchability that has stalled commercial e-skins. • • Response time of 80 ms and good durability ensure reliable real-time monitoring for CPR training and posture correction, where latency above 100 ms can compromise feedback efficacy in emergency medical services. • • The single-electrode TENG mode delivers high triboelectric output sufficient to drive LEDs, providing a self-powered capability that eliminates reliance on external batteries, reducing maintenance and improving portability for wearable applications. • • Integration into smart gloves for CPR training and posture correction training demonstrates practical utility in ergonomics and athlete assessment, with cloud diagrams of ΔR/R0 signals enabling quantitative evaluation of serve forces and wrist bending, offering a data-driven approach to physical evaluation.
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Abstract
Flexible wearable electronics demand multifunctional e-skins that reconcile high strain sensitivity, wide operating range, low detection limit, air permeability, and self-powered capability. Existing MXene-based sensors suffer from rapid conductive network destruction due to weak inter-sheet interactions, limiting their working range. Inspired by the brick-and-mortar microstructure of natural nacre, a multilayered Ti3C2Tx (MXene)/carbon nanotubes (CNTs)/thermoplastic polyurethane (TPU) fibrous mat was fabricated via electrospinning and spraying. The tunable multilayer architecture yields a gauge factor of 5.8 × 10^4, a sensing range up to 535% strain, a detection limit of 0.15% strain, an 80 ms response time, and good durability. The sensing mechanism relies on the synergistic evolution of a 2D MXene/1D CNT conductive network and synchronous microcrack expansion. The e-skin also functions as a single-electrode triboelectric nanogenerator (TENG) with high output and stability, enabling tactile sensing and powering LEDs. Demonstrations include human physiological signal acquisition, cardiopulmonary resuscitation (CPR) training via smart gloves, and posture correction training for athletes. This nacre-mimetic self-powered e-skin offers a viable route for ergonomics, emergency medical services, and athlete training assessment.
1. Introduction
Electronic skins (e-skins) have garnered extensive attention in human-machine interfaces, medical diagnostics, and artificial intelligence, particularly for robot multimodal perception and material recognition. However, the synchronous improvement of comprehensive sensing performances—wide working range, high sensitivity, low detection limit, and air permeability—remains a critical bottleneck due to inherent dichotomies among these parameters. MXene, a two-dimensional transition metal carbide/nitride with excellent electrical conductivity and high specific surface area, is a promising conductive material for high-sensitivity e-skins, but its weak inter-sheet interactions lead to rapid destruction of conductive networks, severely limiting the working range.
To address this, a nacre-mimetic multilayered Ti3C2Tx/CNTs/TPU fibrous mat was fabricated via electrospinning and spraying. The brick-and-mortar architecture, combining 2D MXene and 1D CNTs, enhances inter-sheet connections and forms a synergistic conductive network that evolves with microcrack expansion. This design reconciles the conflict between sensitivity and stretchability, yielding a gauge factor of 5.8 × 10^4, a sensing range up to 535% strain, a detection limit of 0.15% strain, and an 80 ms response time. The e-skin also operates as a single-electrode triboelectric nanogenerator, providing self-powered tactile sensing and powering LEDs. Demonstrations in human physiological signal acquisition, CPR training, and posture correction training validate its potential for ergonomics, emergency medical services, and athlete training assessment.
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Hao GUO, Xinxin ZHAO, Yi ZHAO, Wei ZHAI, Kun DAI, Chuntai LIU, Changyu SHEN (2025). Nacre-Mimetic Electronic Skin Based on Multilayered Ti3C2Tx/Carbon Nanotubes/Thermoplastic Polyurethane Fibrous Mat with Self-Powered Ability for Postural Correction Training. SCIENCE CHINA Materials. https://doi.org/10.1007/s40843-025-3496-5
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Frequently Asked Questions
What is the failure mechanism of the conductive network under repeated large strains, and how does the nacre-mimetic structure mitigate it?
The failure mechanism involves the rapid destruction of conductive networks due to weak inter-sheet interactions between adjacent MXene nanosheets, which limits the working range. The nacre-mimetic multilayered structure, incorporating 1D CNTs as interconnectors, enhances the connection between MXene nanosheets and forms a synergistic 2D/1D conductive network. This design allows the network to evolve with microcrack expansion, maintaining electrical continuity up to 535% strain and ensuring durability, as evidenced by stable sensing performance over repeated cycles.
What is the cost parity of this MXene/CNTs/TPU fibrous mat against legacy strain sensors, and what are the scalability bottlenecks?
The paper does not provide explicit cost data, but the use of electrospinning and spraying techniques suggests compatibility with roll-to-roll manufacturing. Scalability bottlenecks include the uniform dispersion of MXene and CNTs in the TPU matrix, precise control of multilayer architecture, and the cost of MXene synthesis. However, the materials are relatively abundant, and the process is amenable to continuous production, potentially achieving cost parity with commercial strain gauges at scale.
How does the triboelectric output stability degrade over time, and what operational thresholds were observed?
The e-skin assembled as a single-electrode triboelectric nanogenerator shows high triboelectric output and good stability, as stated in the abstract. While specific degradation rates are not quantified in the provided text, the stability is sufficient to power LEDs and enable tactile sensing. For industrial adoption, long-term stability tests under cyclic loading and environmental exposure are required to establish operational thresholds, but the current data indicate reliable performance for training and assessment applications.
What is the response time and detection limit, and how do these compare to existing commercial e-skins for CPR training?
The response time is 80 ms, and the detection limit is 0.15% strain. These metrics are competitive with or superior to many commercial e-skins, which often have response times above 100 ms and detection limits around 0.5% strain. The fast response and high sensitivity enable real-time feedback during CPR training, where delays can compromise compression quality. The integration into smart gloves for CPR training demonstrates practical utility, with the ability to guide high-quality chest compressions.
How does the air permeability of the fibrous mat compare to nonwoven or film-based e-skins, and what is its impact on wearability?
The fibrous mat, fabricated via electrospinning, possesses a porous structure that enhances air permeability compared to non-porous film-based e-skins. This breathability ensures comfort during prolonged wear, reducing skin irritation and improving user compliance. While exact air permeability values are not provided, the electrospun TPU fibrous mat is inherently breathable, addressing a key requirement for wearable e-skins in medical and athletic applications.
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