Flexible sensors based on CNTs/SEBS for human monitoring

The flexible sensor exhibits high sensitivity, a wide detection range, and excellent cycle stability. However, achieving both high sensitivity and an extensive response range simultaneously in flexible strain sensors remains a significant challenge. In this study, we prepared a series of flexible strain sensors using CNTs/SEBS by varying the content of carbon nanotubes (CNTs), with SEBS serving as the flexible substrate and CNTs as the conductive material. The results indicated that both the mechanical properties and sensitivity of the sensor improved with increasing CNT content. Notably, when the CNT content was 0.10 g, the sensor demonstrated optimal overall performance. Within a strain range of 0 to 80%, its sensitivity reached 71.96; during this phase, its operational mechanism is characterized by disconnection phenomena. Conversely, within a strain range of 80 to 200%, sensitivity decreased to 34.68, at which point the working mechanism transitioned to tunneling. The sensor maintained stable operation across various degrees and rates of strain while preserving good sensing performance after undergoing 2000 cycles. Therefore, this flexible strain sensor showcases exceptional sensing characteristics along with a broad response range, indicating substantial potential for applications in human motion monitoring.