Hierarchical rGO‐Based Triboelectric Sensors Enable Motion Monitoring and Trajectory Tracking

Abstract Flexible sensors are increasingly recognized for their transformative potential in wearable electronic devices, medical monitoring, and human‐computer interaction. Despite the advancements, developing a flexible sensor array with a simple structure and large area preparation for effective signal sensing and monitoring capabilities remains challenging. In this study, a hierarchical rGO‐based flexible triboelectric sensor (HG‐FTS) is scalably prepared by a simple blade‐coating approach, in which the nitrogen‐doped reduced graphene oxide (rGO) sheet is hierarchically deposited in a polydimethylsiloxane (PDMS) layer. The flexible triboelectric sensor performed in single electrode mode not only demonstrates exceptional reliability and consistency but also achieves a maximum voltage of ≈129 V and a power density of ≈0.5 W m −2 . These characteristics enable the real‐time monitoring of human physiological signals and joint motion with high fidelity. Furthermore, an intelligent human‐computer interactive control system is developed using the HG‐FTS, featuring a digital array touch screen with a rectangular pattern. The build system can be successfully used for pressure sensing, object shape recognition, and trajectory tracking. This work provides a viable solution to the large area preparation and high‐performance flexible sensor manufacturing and demonstrates the potential application of HG‐FTS in human‐computer interaction, signal monitoring, and intelligent sensing.