The current demand for sensors that detect falling events in aged people, infants, and toddlers is increasing. Conventional sensors used for falling detection are mainly classified as acceleration sensors. However, these sensors are susceptible to false recognition because of the possibility of triggering upon sliding movement. Therefore, a novel fall-detecting sensor using triboelectric nanogenerator (TENGs) is proposed. This sensor can effectively detect falling as it measures the impact pressure upon falling. In particular, a novel falling sensor based on brush TENGs (B-TENGs), using nylon and fluorinated ethylene propylene fiber brushes as the friction materials, was investigated. The fabricated B-TENGs harvested an open circuit voltage of approximately 8 V under 98 N of contact force in the vertical direction. In addition, the maximum open circuit voltage harvested under the contact force in the horizontal direction was 20.88 V, which was 11.6 times larger than that obtained in two-dimensional film-based TENGs (1.80 V). Therefore, B-TENGs can harvest a large power output due to the three-dimensional structure of the brush textile. As a result, B-TENGs have potential applications as sensors for detecting falls within 360° angle range.

目前对检测老年人、婴儿和幼儿跌倒事件的传感器的需求正在增加。用于跌倒检测的常规传感器主要分类为加速度传感器。然而，这些传感器容易被错误识别，因为有可能在滑动时触发。因此，提出了一种使用摩擦纳米发电机（TENGs）的新型跌倒检测传感器。该传感器可以有效地检测跌倒，因为它测量跌倒时的冲击压力。特别是，研究了一种基于刷式 TENG (B-TENG) 的新型跌落传感器，使用尼龙和氟化乙烯丙烯纤维刷作为摩擦材料。制造的 B-TENG 在垂直方向上 98 N 的接触力下获得了大约 8 V 的开路电压。此外，在水平方向的接触力下获得的最大开路电压为 20.88 V，是二维薄膜基 TENG（1.80 V）的 11.6 倍。因此，由于毛刷织物的三维结构，B-TENGs 可以获得较大的功率输出。因此，B-TENG 具有潜在的应用，因为传感器用于检测落在 360° 角度范围内。