Recently, wearable strain sensors based on elastomeric conductive composites have attracted tremendous attention in human motions and physical signals detection. However, it is still challenging to achieve good conjunction between broad strain range and high sensitivity performance for a wide range of applications. Here, we construct a highly stretchable and sensitive natural rubber (NR) based strain sensor from polypyrrole modified bacterial cellulose nanofiber (cPPy/BCNF) network. Due to the large aspect ratio and strong interfacial interaction of BCNF templates, cPPy/BCNF could form continuous conductive pathways in NR matrix with an extremely low loading, thus greatly reducing the permeability threshold of the elastomer. Consequently, our strain sensor performs remarkable sensitivity over a broad strain range (0–388%) and long-term reliability (3000 cycles at 60% and 180% strain). Particularly, a high gauge factor of 355.3 recorded in the strain range of 279–388% has been achieved, outperforming most reported NR-based stretchable strain sensor. Meanwhile, the sensor also exhibits stable strain sensing behavior under different amplitude of human motions such as finger, wrist, elbow, and knee joint bending. Our work provides more opportunities for the design of effective elastomeric conductors in the application of wearable electronic devices.

最近，基于弹性导电复合材料的可穿戴应变传感器在人体运动和物理信号检测中引起了极大的关注。但是，要在广泛的应用范围内实现宽应变范围和高灵敏度性能之间的良好结合仍然是一项挑战。在这里，我们从聚吡咯修饰的细菌纤维素纳米纤维（cPPy / BCNF）网络构建高度可拉伸且灵敏的天然橡胶（NR）基应变传感器。由于BCNF模板的长宽比大且界面相互作用强，因此cPPy / BCNF可以在NR基体中以极低的载荷形成连续的导电路径，从而大大降低了弹性体的渗透性阈值。所以，我们的应变传感器在很宽的应变范围（0–388％）和长期可靠性（在60％和180％应变下可进行3000次循环）中表现出出色的灵敏度。特别是，在279–388％的应变范围内实现了355.3的高应变系数，优于大多数报道的基于NR的可拉伸应变传感器。同时，该传感器在诸如手指，手腕，肘部和膝关节弯曲等不同幅度的人体运动下也表现出稳定的应变感应行为。我们的工作为可穿戴电子设备的应用提供了更多设计有效弹性体导体的机会。该传感器在诸如手指，腕部，肘部和膝关节弯曲等不同幅度的人体运动下也表现出稳定的应变感应行为。我们的工作为可穿戴电子设备的应用提供了更多设计有效弹性体导体的机会。该传感器在诸如手指，腕部，肘部和膝关节弯曲等不同幅度的人体运动下也表现出稳定的应变感应行为。我们的工作为可穿戴电子设备的应用提供了更多设计有效弹性体导体的机会。