Mechanical sensors are mainly divided into two types (vertical force sensing and lateral strain sensing). Up to now, one sensor with two working modes is still a challenge. Here, we demonstrate a structural design concept combing a piezoelectric nano/microwire with a flexible polymer with protrusions that enables a dual-modal piezotronic transistor (DPT) with two working modes for highly sensitive vertical force sensing and lateral strain sensing. For vertical force sensing, DPT exhibits a force sensitivity up to 221.5 N⁻¹ and a minimum identifiable force down to 21 mN, corresponding to a pressure sensitivity of 1.759 eV/MPa. For lateral strain sensing, DPT can respond to a large compression strain (~5.8%) with an on/off ratio up to 386.57 and a gauge factor up to 8988.6. It is a universal design that can integrate vertical force sensing and lateral strain sensing into only one nanodevice, providing a feasible strategy for multimodal devices.

机械传感器主要分为两种类型（垂直力传感和横向应变传感）。到目前为止，一个传感器具有两种工作模式仍然是一个挑战。在这里，我们展示了一种结构设计概念，将压电纳米/微米线与带有突起的柔性聚合物相结合，使双模态压电晶体管（DPT）具有两种工作模式，可实现高灵敏度的垂直力传感和横向应变传感。对于垂直力传感，DPT 表现出高达 221.5 N ^-1的力灵敏度和低至 21 mN 的最小可识别力，对应于 1.759 eV/MPa 的压力灵敏度。对于横向应变传感，DPT 可以响应大压缩应变 (~5.8%)，开/关比高达 386.57，应变系数高达 8988.6。它是一种通用设计，可以将垂直力传感和横向应变传感集成到一个纳米器件中，为多模态器件提供了一种可行的策略。