Ionic hydrogels are uniquely suited as force‐sensing layers because of their good biocompatibility and controlled electromechanical properties. The emerging piezoionic effect allows them to sense the position of pressure, but the low response rate limits their applications. Herein, this work focuses on modulating the response time of piezoionic outputs through crosslinking. The underlying mechanism is investigated through the perspective of deformation recovery rate and ion migration behavior in the ionic hydrogels. As a result, the developed piezoionic sensors are capable of distinguishing static forces in the range of 0.1–5 s while monitoring dynamic force, breaking the limitations of conventional self‐powered pressure sensors that have trouble tracking static forces. Furthermore, by utilizing the piezoionic effect to convert the touch indentation into transverse gradient ionic potential, the constructed piezoionic sensors achieve accurate monitoring of finger pressing position and sliding trajectory. As a proof‐of‐concept, pattern unlocking in security authentication is successfully validated based on the developed piezoionic sensors. This design strategy of modulating ionic tactile sensor by crosslinking is expected to provide a fresh path for the large‐scale flexible human‐machine interfaces.

中文翻译：

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交联调制水凝胶压离子传感器，用于人机界面中的图形安全认证


离子水凝胶因其良好的生物相容性和受控的机电特性而特别适合用作力传感层。新兴的压电效应使它们能够感应压力的位置，但低响应率限制了它们的应用。在此，这项工作的重点是通过交联调节压电离子输出的响应时间。通过离子水凝胶中的变形恢复速率和离子迁移行为的角度研究了其潜在机制。因此，开发的压电传感器能够在监测动态力的同时区分 0.1-5 s 范围内的静态力，打破了传统自供电压力传感器难以跟踪静态力的局限性。此外，通过利用压电效应将触摸压痕转换为横向梯度离子势，构建的压电传感器实现了对手指按压位置和滑动轨迹的精确监测。作为概念验证，基于开发的压电传感器成功验证了安全认证中的模式解锁。这种通过交联调制离子触觉传感器的设计策略有望为大规模柔性人机界面提供一条新的路径。