Ge Rui, Yu Qiuhong, Zhou Feng, Liu Shuhai, Qin Yong
School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, Shaanxi, 710071, China.
Institute of Nanoscience and Nanotechnology, School of Materials and Energy, Lanzhou University, Lanzhou, Gansu, 730000, China.
Nat Commun. 2023 Oct 9;14(1):6315. doi: 10.1038/s41467-023-41983-3.
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 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，具有两种工作模式的单个传感器仍然是一个挑战。在此，我们展示了一种结构设计概念，即将压电纳米/微线与带有凸起的柔性聚合物相结合，从而实现一种具有两种工作模式的双模态压电器件（DPT），用于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能够响应高达约5.8%的大压缩应变，开/关比高达386.57，应变计因子高达8988.6。这是一种通用设计，可将垂直力传感和横向应变传感集成到单个纳米器件中，为多模态器件提供了一种可行的策略。
