Ultrastretchable Polyaniline-Based Conductive Organogel with High Strain Sensitivity,ACS Materials Letters

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Ultrastretchable Polyaniline-Based Conductive Organogel with High Strain Sensitivity
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-09-08 , DOI: 10.1021/acsmaterialslett.1c00368
Yucheng Zhang ₁ , Yusen Zhao ₁ , Zihang Peng ₁ , Bowen Yao _{1,

2} , Yousif Alsaid ₁ , Mutian Hua ₁ , Dong Wu ₁ , Yu Qiu ₁ , Qibing Pei ₁ , Xinyuan Zhu ₂ , Zhiyuan He ₃ , Ximin He ₁

Affiliation

Strain sensors, as a key component of wearable/stretchable electronics, typically exhibit an intrinsic conflict between large strain (>100%) and high sensitivity (gauge factor > 10). This Letter reports a solution to this trade-off by creating a high-conductivity thin layer of polyaniline (PANi) percolated through the outer surface of a polymethyl acrylate organogel. The highly robust, conductive organogel can achieve both high gauge factor and large strain via the mismatch between the fragile PANi and the elastic polyacrylate blending layer. The high gauge factor over the entire strain range of 2000% enables its broad sensing range from human pulse to massive deformation. The water-free conductive organogel provides purely electronic conductivity and allows for working under extreme conditions, which typical conductive hydrogels cannot withstand. These merits allows the sensor to present high sensitivity for both subtle movement (8% resistance change for pulse detection) and large strain (a gauge factor of 376 at 460% strain). Such a conductive organogel also demonstrated great sustainability under harsh operating conditions, as demonstrated by a dielectric elastomer actuator based on it, capable of generating a horizontal displacement of 15.7 mm (46% of the total length) at −12 °C, as a substitute for conventional hydrogels as the electrode.

中文翻译：

具有高应变敏感性的超拉伸聚苯胺基导电有机凝胶

应变传感器作为可穿戴/可拉伸电子产品的关键组件，通常表现出大应变 (>100%) 和高灵敏度 (应变系数 > 10) 之间的内在冲突。这封信报告了通过创建一个高导电性的聚苯胺 (PANi) 薄层渗透到聚丙烯酸甲酯有机凝胶的外表面来解决这种权衡的解决方案。高度坚固的导电有机凝胶可以通过易碎的 PANi 和弹性聚丙烯酸酯混合层之间的不匹配实现高应变系数和大应变。在 2000% 的整个应变范围内的高应变系数使其能够实现从人体脉冲到大规模变形的广泛传感范围。无水导电有机凝胶提供纯电子导电性，并允许在极端条件下工作，这是典型的导电水凝胶无法承受的。这些优点使传感器对细微运动（脉冲检测的电阻变化为 8%）和大应变（应变为 460% 时应变系数为 376）均具有高灵敏度。这种导电有机凝胶在恶劣的操作条件下也表现出极大的可持续性，正如基于它的介电弹性体致动器所证明的那样，能够在 -12°C 下产生 15.7 毫米（总长度的 46%）的水平位移，作为替代品对于传统的水凝胶作为电极。

更新日期：2021-10-04

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