Zhang Yongkang, Hu Xiaonan, Yan Zhaonan, Zhang Siyu, Zhao Jiling, Sun Hao, Liu Shuhai, Qin Yong
Institute of Nanoscience and Nanotechnology, School of Materials and Energy, Lanzhou University, Lanzhou, Gansu, China.
MIIT Key Laboratory of Complex-field Intelligent Exploration, Beijing Institute of Technology, Beijing, China.
Nat Commun. 2025 Jul 11;16(1):6410. doi: 10.1038/s41467-025-61526-2.
Although organic piezoelectric materials are increasingly being studied in the field of biomechanical sensing, the combination of high piezoelectricity and high softness is still a huge challenge due to the existence of steric hindrance effect. To conquer this, a polar engineering utilizing liquid-liquid interface induced orientation is developed. It induces polar asymmetry in two linear polymers (polystyrene-block-polyisoprene-block-polystyrene/polyethylene glycol, PEG/SIS) with low steric hindrance through a polar interface, thereby achieving high piezoelectricity in a soft material system. This PEG/SIS combined film not only exhibits a piezoelectric coefficient as high as 22.9 pC/N, and stable performance, without attenuation for 60 days, which is comparable to the piezoelectricity of the natural organic materials PVDF, but also has an ultra-softness (~1 × 10 Pa) similar to that of skin, cartilage and aorta, showing high mechanical compliance with biological tissues. This work gives an approach for the development of organic piezoelectric materials, and is expected to achieve large-scale production and application of highly sensitive flexible biomechanical sensors on various surfaces and in vivo environments.
尽管有机压电材料在生物力学传感领域的研究日益增多，但由于空间位阻效应的存在，实现高压电性与高柔软性的结合仍是一个巨大挑战。为克服这一问题，开发了一种利用液 - 液界面诱导取向的极性工程。它通过极性界面在两种空间位阻低的线性聚合物（聚苯乙烯 - 嵌段 - 聚异戊二烯 - 嵌段 - 聚苯乙烯/聚乙二醇，PEG/SIS）中诱导极性不对称，从而在柔软材料体系中实现高压电性。这种PEG/SIS复合膜不仅表现出高达22.9 pC/N的压电系数，且性能稳定，60天无衰减，与天然有机材料聚偏氟乙烯（PVDF）的压电性相当，还具有与皮肤、软骨和主动脉相似的超柔软性（~1×10 Pa），对生物组织表现出高机械顺应性。这项工作为有机压电材料的发展提供了一种方法，有望实现高灵敏度柔性生物力学传感器在各种表面和体内环境中的大规模生产与应用。
