Synergy of ZnO Nanowire Arrays and Electrospun Membrane Gradient Wrinkles in Piezoresistive Materials for Wide-Sensing Range and High-Sensitivity Flexible Pressure Sensor

Lei, Peng; Bao, Yan; Zhang, Wenbo; Gao, Lu; Zhu, Xiaofeng; Xu, Jiachen; Ma, Jianzhong

doi:10.1007/s42765-023-00359-4

Adv. Fiber Mater.

2024

DOI: 10.1007/s42765-023-00359-4

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Synergy of ZnO Nanowire Arrays and Electrospun Membrane Gradient Wrinkles in Piezoresistive Materials for Wide-Sensing Range and High-Sensitivity Flexible Pressure Sensor

Peng Lei,

Yan Bao,

Wenbo Zhang

et al.

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2024

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Cited by 11 publications

References 54 publications

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Smart Driving Hardware Augmentation by Flexible Piezoresistive Sensor Matrices with Grafted‐on Anticreep Composites

Chen,

Yang,

Wang

et al. 2024

Advanced Science

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Signal drift and hysteresis of flexible piezoresistive sensors pose significant challenges against the widespread applications in emerging fields such as electronic skin, wearable equipment for metaverse and human‐AI (artificial intelligence) interfaces. To address the creep and relaxation issues associated with pressure‐sensitive materials, a highly stable piezoresistive composite is proposed, using polyamide‐imide (PAI) fibers as the matrix and in situ grafted‐polymerized polyaniline (PANI) as the semi‐conducting layer. The PAI with large rigid fluorenylidene groups exhibits a high glass transition temperature of 372 °C (PAI 5‐5), which results in an extremely long relaxation time at room temperature and consequently offers outstanding anti‐creep/relaxation performances. The enhancement of PAI‐PANI interfacial bonding through in situ grafting improves the sensor reliably. The sensor presents high linear sensitivity of 35.3 kPa−1 over a pressure range of 0.2–20 kPa, outstanding repeatability, and excellent dynamic stability with only a 3.8% signal deviation through ≈10 000 cycles. Real‐time visualization of pressure distribution is realized by sensor matrices, which demonstrate the capability of tactile gesture recognition on both flat and curved surfaces. The recognition of sitting postures is achieved by two 12 × 12 matrices facilitated by machine learning, which prompts the potential for the augmentation of smart driving.

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Smart Driving Hardware Augmentation by Flexible Piezoresistive Sensor Matrices with Grafted‐on Anticreep Composites

Chen,

Yang,

Wang

et al. 2024

Advanced Science

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Organohydrogel Based Electronic Skin Reinforced by Dual‐Mode Conduction and Hierarchical Collagen Fibers Skeleton

Guo,

Bao,

Zheng

et al. 2024

Advanced Science

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Collagen fiber skeleton from animal skin is an ideal substrate for electronic skin (e‐skin). However, the interface mismatch between conductive materials and skeleton and the monotonicity of conductive network still hinder its creation. Herein, a novel collagen fiber‐based e‐skin with dual‐mode conduction of NaCl and conductive spheres (IECS) is accomplished by loading organohydrogel into the skeleton via “permeation and self‐assembly”. The resulting interpenetrating network produces a 3D continuous, conductive pathway and strong interface interaction with high‐density hydrogen bonding, thus exhibiting excellent strength (24.5 MPa), conductivity (14.82 S m−1), sensing performance (sensitivity of 16.64), and environmental stability. The physical structure (3D skeleton, interpenetrating network) and chemical interaction (interface interaction, salting‐out) achieve energy dissipation. Meanwhile, the sensitivity is enhanced by dual‐mode conduction, conductive sphere array, and deformation amplification induced by collagen fibers. Additionally, the strong bonding ability between glycerin and collagen fibers with water molecules provides anti‐freezing and moisture‐retention characteristics. Thus, the strategic synergy of compositional and structural design makes IECS a promising force‐sensing part of piezoresistive sensor for human movement, pulse frequency, cipher transmission, and pressure distribution. In short, IECS presents a multifunctional platform for the invention of high‐performance e‐skin with on‐demand property, which offers great application potential in wearable electronics.

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Facile Preparation of Carbon Nanotube‐Based Skin‐Like Pressure Sensors

Yu,

Adronov

2024

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Flexible sensors have garnered significant interest for their potential to monitor human activities and provide valuable feedback for healthcare purposes. Single‐walled carbon nanotubes (SWNTs) are promising materials for these applications but suffer from issues of poor purity and solubility. Dispersing SWNTs with conjugated polymers (CPs) enhances solution processability, yet the polymer sidechains can insulate the SWNTs, limiting the sensor's operating voltage. This challenge can be addressed by incorporating a self‐immolative linker into the sidechain of a poly(fluorene‐co‐phenylene) polymer, facilitating the fast and clean removal of sidechains and enabling the generation of high‐conductivity SWNT materials. In this work, the integration of this advanced material with polydimethylsiloxane (PDMS) to create skin‐like ultra‐wrinkled film surfaces in a simple, cost‐effective, and highly reproducible manner is demonstrated. The sensors exhibit remarkable sensitivity (1,655 kPa⁻¹) across a wide dynamic range (0.003–70.1 kPa, R2 = 0.9931) when the wrinkle axis is aligned perpendicularly to the interdigitated electrode fingers. The sensor shows an almost instantaneous pressure response and maintains excellent stability. This sensor can monitor various human motions, from low‐intensity activities such as breathing, pulse, and voice vibrations to high‐intensity actions like walking and jumping, highlighting their potential use in wearable human health monitoring systems.

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Synergy of ZnO Nanowire Arrays and Electrospun Membrane Gradient Wrinkles in Piezoresistive Materials for Wide-Sensing Range and High-Sensitivity Flexible Pressure Sensor

Cited by 11 publications

References 54 publications

Smart Driving Hardware Augmentation by Flexible Piezoresistive Sensor Matrices with Grafted‐on Anticreep Composites

Smart Driving Hardware Augmentation by Flexible Piezoresistive Sensor Matrices with Grafted‐on Anticreep Composites

Organohydrogel Based Electronic Skin Reinforced by Dual‐Mode Conduction and Hierarchical Collagen Fibers Skeleton

Facile Preparation of Carbon Nanotube‐Based Skin‐Like Pressure Sensors

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