高伸縮性で広範な作動範囲を持つ高感度ポリマーフォームセンサーを開発(Scientists Develop Highly Stretchable and Sensitive Polymer-based Foam Sensor with Wide Work Range)

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2025-06-27 中国科学院(CAS)

高伸縮性で広範な作動範囲を持つ高感度ポリマーフォームセンサーを開発(Scientists Develop Highly Stretchable and Sensitive Polymer-based Foam Sensor with Wide Work Range)The POE/CNS foam sensor with segregated structure (Image by NIMTE)

中国科学院寧波材料技術与工程研究所の王龍教授らの研究チームは、超臨界CO₂(scCO₂)発泡法を用いて、超高伸縮性と高感度を兼ね備えた導電性フォームセンサーを開発した。高アスペクト比の炭素ナノ構造(CNS)とポリオレフィンエラストマー(POE)を分離構造で複合し、多孔質構造を形成することで、電気ネットワークを再構築。これにより、最大952.5%の伸縮、762%の広範な歪み応答域、50kΩの導電性、4000回以上の伸長サイクルで安定した性能を達成した。さらに応答速度、再現性、耐久性にも優れ、ウェアラブル電子機器やロボティクス分野での応用が期待される。環境に優しく、効率的な高性能ポリマーセンサーの製造手法として注目される成果である。

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超広いひずみ範囲を持つ高伸縮・高感度発泡センサーの新しい設計戦略 Novel design strategy for highly stretchable and sensitive foam sensor with an ultra-wide strain range

Xueyun Li, Wei Zhou, Yu Cao, Quanyou Wei, Tianyu Jiao, Shijie Cui , Minghui Wu, Peng Xiao, Long Wang, Wenge Zheng
Materials Today Physics  Available online: 2 May 2025
DOI:https://doi.org/10.1016/j.mtphys.2025.101741

Abstract

Porous conductive materials with high stretchability are promising candidate about flexible electronics. However, it is a long-standing challenge for porous sensors to have an ultra-broad strain range due to their conductive or mechanical failure. Herein, to the best of our knowledge, we firstly employed the supercritical CO2 (scCO2) foaming to prepare a thin (500 μm), waterproof, and highly stretchable polyolefin elastomer (POE)/carbon nanostructures (CNS) foam sensor with segregated structure. Compared to POE/CNS foam with randomly distributed structure, the segregated POE/CNS foam had a superior stretchability (952.5 % strain), much better elasticity (a residual strain of 13.8 %), and much lower electrical resistance (50 kΩ) owing to selective distribution of CNS. Hence segregated POE/CNS composite foam simultaneously achieved an excellent stretchability and well electrical conductivity. Additionally, the brittle conductive layer became flexible due to the diffusion of POE molecule chains into CNS, which hindered rapid crack propagation of conductive layer during stretching, extending the strain response range of foam sensor. These two reasons enabled segregated POE/CNS foam to display an ultra-wide response range from 0.5 % to 762 % strain, which was well beyond the randomly distributed POE/CNS foam (153.5 % strain). Moreover, the reconstructed conductive network structure by scCO2 foaming endowed it with high sensitivity (GF = 15230). The segregated POE/CNS foam also had a short response time (200 ms), excellent reproducibility, and long-term durability (4000 cycles). Thereby it could be applied in full-range human motion monitoring and engineering equipment.

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