Elastomeric conductive hybrid hydrogels with continuous conductive networks
Elastomeric conductive hybrid hydrogels with continuous conductive networks
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具有连续导电网络的弹性体导电混合水凝胶
DOI：
10.1039/c9tb00173e
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发表时间：
2019-04-21
影响因子：
7
通讯作者：
Ning, Chengyun
中科院分区：
文献类型：
--
作者：
Hu, Shiqian;Zhou, Lei;Ning, Chengyun
将导电聚合物与弹性体水凝胶相结合的弹性体导电混合水凝胶（ECH）最近引起了人们的兴趣，因为它们在可穿戴或可植入传感设备等生物电子学领域有着广泛的应用。然而，当导电聚合物用作水凝胶网络中的填料时，ECH 的电导率通常会受到损害，因为 ECH 的固有局限性严重限制了其适用性。在这里，我们通过使用仿生儿茶酚衍生物多巴胺（DA）作为弹性水凝胶双网络内导电聚吡咯（PPy）原位聚合的掺杂剂和介体，显着提高了ECH的电导率。一般来说，通过常规方法制备的ECH倾向于形成分散在多孔水凝胶基质内的导电聚合物的独立岛结构。我们发现，使用 DA 介体制备的连续导电 PPy 网络促进了 ECH 内的快速电子转移，其表现出良好的弹性机械性能、优异的生物相容性以及适合植入式应变传感应用的高力或应变响应性。
Elastomeric conductive hybrid hydrogels (ECHs) combining conducting polymers with elastomeric hydrogels have recently attracted interest due to their wide range of applications in bioelectronics such as wearable or implantable sensing devices. However, the conductivity of ECHs is typically compromised when conductive polymers are used as fillers in hydrogel networks because the inherent limitations of ECHs severely restrict their applicability. Here, we significantly improved the electrical conductivity of ECHs by using a bioinspired catechol derivative, dopamine (DA), as the dopant and mediator for the in situ polymerization of conducting polypyrrole (PPy) within the elastomeric hydrogel dual- networks. In general, ECHs prepared by conventional methods tend to form separate island structures of conductive polymers dispersed within porous hydrogel matrices. We found that a continuous conductive PPy network prepared using the DA mediator facilitated fast electron transfer within the ECHs, which showed good elastomeric mechanical properties, excellent biocompatibility and high force- or strain- responsiveness suitable for implantable strain- sensing applications.