Abstract：
Flexible sensors have developed rapidly due to their great application potential in the intelligent era. However, the frequent bending work requirements pose a serious challenge to the mechanical reliability of flexible sensors. Herein, a strategy of using a new multielectrode layout to achieve multiple sensing signals based on one external signal is proposed for the first time to improve the reliability of flexible piezoresistive sensors. The multielectrode layout consists of a pair of interdigital electrodes and a bottom electrode. The interdigitated electrodes are used to sense the change in the surface resistance of the sensor, and the interdigital electrodes and the bottom electrode are used to sense the change in the bulk resistance of the sensor. As a result, without increasing the sensing unit area, the electrode layout allows the sensor to generate three response electrical signals when sensing an external pressure, thus improving the reliability of the sensor. Based on the electrode layout, a highly reliable flexible piezoresistive sensor with a multilevel porous structure is obtained by a microwave foaming method with a template. In the working state of sensing surface resistance, the sensor has a 22.12 kPa-1 sensitivity. Meanwhile, in the working state of sensing bulk resistance, the sensor shows a 55.17 kPa-1 sensitivity. Furthermore, the sensor is applied to monitor human pulse and speech signals, demonstrating its multisignal output characteristics and potential applications in flexible electronics. In conclusion, the new strategy of using the proposed electrode layout to improve the reliability of flexible sensors is expected to greatly promote the practical application of flexible electronics.
摘要：
柔性传感器由于其在智能时代的巨大应用潜力而发展迅速。然而,频繁的弯曲工作要求对柔性传感器的机械可靠性提出了严峻的挑战。在这里，为了提高柔性压阻传感器的可靠性，首次提出了一种基于一个外部信号的多电极布局实现多传感信号的策略。多电极布局由一对叉指电极和底部电极组成。叉指电极用于感测传感器表面电阻的变化，叉指电极和底部电极用于感测传感器体电阻的变化。因此,在不增加传感单元面积的情况下，电极布局允许传感器在感应外部压力时产生三个响应电信号，从而提高了传感器的可靠性。根据电极布局，通过带有模板的微波发泡方法获得了具有多层多孔结构的高度可靠的柔性压阻传感器。在感应表面电阻的工作状态下，传感器具有22.12kPa-1的灵敏度。同时,在感应体电阻的工作状态下，传感器显示55.17kPa-1的灵敏度。此外，该传感器用于监测人体脉搏和语音信号，展示了它的多信号输出特性和在柔性电子中的潜在应用。总之,采用所提出的电极布局提高柔性传感器可靠性的新策略,有望大大促进柔性电子的实际应用。
