Flexible strain sensors have attracted great attention in the field of human health monitoring. Carbon nanotubes (CNTs) and graphene with outstanding electrical conductivity and nanoscale flexibility are often used in the field of stretchable strain sensor. Nevertheless, the combination of high sensitivity and a wide sensing range for stretchable strain sensors seems to be a dilemma. Here, a highly stretchable and sensitive strain sensor was prepared by simply dripping CNTs/graphene conductive composite on a pre-stretching silicon-containing elastomer. Pre-stretching is the key to enhancing the gauge factor (GF) and stretchability of the strain sensor. Compared with the CNTs/graphene coated elastomer without pre-stretching (GF = 4377.23), the GF of the CNTs/graphene coated elastomer with pre-stretching are significantly improved. GF of 28,752.95 (at strain of 23%) is achieved without sacrificing the stretchability at a prestrain coefficient (ε_pre) of 60%. graphene sheets are introduced as the conducting bridge among the adjacent CNTs to significantly improve the stability of the conductive network, thus forming a structure of line-to-plane electrical conduction pathway to provide the sensor with sufficient flexibility. The strain sensor exhibits excellent tensile properties (up to 400% strain) and ultra-high relative resistance change (ΔR/R₀ = 14,719.41) over a wide sensing range (approximately 100% strain) with high durability and repeatability. The pre-stretching CNTs/graphene coated elastomer was then assembled at human joints for detection. The result shows that the strain sensor demonstrates potential applications in wearable electronic products.

柔性应变传感器在人体健康监测领域引起了极大的关注。具有出色的导电性和纳米级柔性的碳纳米管（CNTs）和石墨烯经常用于可拉伸应变传感器领域。然而，可伸缩应变传感器的高灵敏度和宽感应范围的结合似乎是一个难题。在此，通过简单地将CNT /石墨烯导电复合材料滴在预拉伸的含硅弹性体上来制备高度可拉伸且灵敏的应变传感器。预拉伸是增强应变传感器的规格因子（GF）和可拉伸性的关键。与未预拉伸的CNTs /石墨烯涂层的弹性体相比（GF = 4377.23），预拉伸的CNTs /石墨烯涂层的弹性体的GF显着提高。28,752的总表ε_预先的60％）。引入石墨烯片作为相邻CNT之间的导电桥，以显着提高导电网络的稳定性，从而形成线到面导电路径的结构，从而为传感器提供足够的柔性。应变传感器 在较宽的传感范围（约100％应变）下具有出色的拉伸性能（高达400％应变）和超高的相对电阻变化（ΔR / R ₀ = 14,719.41），具有很高的耐用性和可重复性。然后将预拉伸的CNTs /石墨烯涂层的弹性体组装在人体关节处进行检测。结果表明，应变传感器展示了在可穿戴电子产品中的潜在应用。