Ultrasoft Conducting Polymer Hydrogels with Large Biaxial Strain and Conformal Adhesion for Sensitive Flexible Sensors

IF 7.2 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Chemistry of Materials Pub Date : 2024-10-18 DOI:10.1021/acs.chemmater.4c01909

Xiaojiao Shi, Linli Xu, Qiuli Xu, Na Li, Xinyu Li, Yubin Zhang, Zhihui Qin, Tifeng Jiao

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Abstract

Conducting polymer hydrogels have been considered as promising materials for flexible sensors. The integrated performances of ultrasoftness, high deformation, mechanical robustness, conformal adhesion, and high sensitivity are of great importance for their applications in wearable sensors but still remains challenging. Herein, a highly deformable conducting polymer hydrogel with ultrasoftness, tear resistance, and self-adhesiveness is fabricated by incorporating poly(3, 4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS) and silk sericin (SS) into a covalently cross-linked polyacrylamide (PAM) network. Owing to abundant noncovalent interactions among the folded SS chains, PAM chains, and PEDOT:PSS, the obtained hydrogel shows a low modulus (10.3 kPa), ultrastretchability (>2000%), particularly large biaxial strain (an areal strain of 1700%), high toughness (tearing energy of 2.5 kJ/m²), and good conformal adhesion. As a result, this hydrogel demonstrates superior strain-sensitivity (gauge factor = 13.8) in a broad strain range (2000%) and excellent sensing reproducibility. The hydrogel-based wearable sensor can be used for accurately monitoring large and tiny human movements in real time and serves as bioelectrodes for precise gathering of electrocardiography and electromyography signals, showing great potential for applications in flexible sensing devices.

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用于灵敏柔性传感器的具有大双轴应变和共形粘附性的超软导电聚合物水凝胶

导电聚合物水凝胶一直被认为是柔性传感器的理想材料。超软、高变形、机械坚固、保形粘附和高灵敏度等综合性能对其在可穿戴传感器中的应用具有重要意义，但仍然具有挑战性。本文通过在共价交联聚丙烯酰胺（PAM）网络中加入聚（3, 4-亚乙二氧基噻吩）：聚（苯乙烯磺酸）（PEDOT:PSS）和丝胶（SS），制备了一种具有超软性、抗撕裂性和自粘性的高变形导电聚合物水凝胶。由于折叠的 SS 链、PAM 链和 PEDOT:PSS 之间存在大量的非共价相互作用，因此获得的水凝胶具有低模量（10.3 kPa）、超拉伸性（2000%）、特别大的双轴应变（1700% 的应变值）、高韧性（2.5 kJ/m2 的撕裂能）和良好的保形粘附性。因此，这种水凝胶在广泛的应变范围（2000%）内表现出卓越的应变灵敏度（测量系数 = 13.8）和出色的传感再现性。这种基于水凝胶的可穿戴传感器可用于实时精确监测人体的大动作和小动作，并可作为生物电极精确采集心电图和肌电图信号，在柔性传感设备中显示出巨大的应用潜力。

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来源期刊

Chemistry of Materials 工程技术-材料科学：综合

CiteScore

14.10

自引率

5.80%

发文量

929

审稿时长

1.5 months

期刊介绍： The journal Chemistry of Materials focuses on publishing original research at the intersection of materials science and chemistry. The studies published in the journal involve chemistry as a prominent component and explore topics such as the design, synthesis, characterization, processing, understanding, and application of functional or potentially functional materials. The journal covers various areas of interest, including inorganic and organic solid-state chemistry, nanomaterials, biomaterials, thin films and polymers, and composite/hybrid materials. The journal particularly seeks papers that highlight the creation or development of innovative materials with novel optical, electrical, magnetic, catalytic, or mechanical properties. It is essential that manuscripts on these topics have a primary focus on the chemistry of materials and represent a significant advancement compared to prior research. Before external reviews are sought, submitted manuscripts undergo a review process by a minimum of two editors to ensure their appropriateness for the journal and the presence of sufficient evidence of a significant advance that will be of broad interest to the materials chemistry community.