In recent years, there has been a significant surge of interest in flexible strain sensors within the domains of wearable electronics and human–computer interaction. However, as these fields continue to advance rapidly, there is an urgent need to improve the comprehensive performance of flexible strain sensors including sensitivity, sensing range, response speed, and durability. In this study, we address this issue by transferring carbon black/graphene (CB/Gr) conductive nanocomposites onto the surface of an Ecoflex flexible substrate, which has been pretreated using sandpaper to enhance adhesion. The resulting flexible strain sensor exhibits high sensitivity, with a gauge factor of 51.4, while offering a wide sensing range of 100%. Notably, this sensor demonstrates high performance across various aspects, including a fast response time (60 ms) and excellent durability (up to 4000 stretching–releasing cycles). The versatility of this sensor is evident in its ability to effectively monitor both small strain activities, such as speech recognition, and larger strain activities, such as elbow bending. Moreover, the sensor has demonstrated outstanding performance in various application scenarios, including human health and motion condition monitoring as well as acoustic wave and vibration signals detection. Consequently, this highlights the sensor’s remarkable adaptability and substantial potential for wide-range applications in these domains.
The capabilities of conductive ink with both excellent conductivity and flexibility properties are extremely important for the construction of next-generation flexible electronic devices. However, the development of an appropriate ink possessing high conductivity and good dispersity remains a big challenge for ink-jet printing. Here, an original synthesis method of surfactant-free carbon black@graphene (CB@rGO) conductive ink is reported via freeze-drying process and reduction in p-phenylenediamine. The CB@rGO ink unambiguously displays a well-defined and smooth morphology, extremely the CB@rGO conductive particles showing good stability in many solvents. The CB@rGO film exhibited outstanding flexibility which is showed by the durable conductivity after bending 1000 times. Furthermore, it has an excellent conductivity of 714 ± 90 S m −1 , and these data increased to 5091 ± 200 S m −1 after the high temperature post-processing increased by 198% compared to the traditional rGO film. Notably, the absence of surfactant in conductive fillers’ dispersing process contributed to the high conductivity of CB@rGO ink compared with the traditional ones.
危险品化学品经营许可证（带存储）