Soft and stretchable electronic devices play an important role in the growing fields of “soft robotics”, electronic skin, prosthetics, etc. As one of the fundamental units for stretchable electronics, strain sensors have been widely investigated in previous studies, although large strain detection is still a well-known challenge. Intrinsically stretchable sensor could undergo large strain depending on the stretchable matrix, and have attracted lots of attentions in recent years. In this study, we introduce liquid metal into the volumetric matrix of the flexible substrates to construct a novel intrinsically strain sensor, which could undergo large strain of the flexible substrates, avoiding the conventional fracture failures at the interfaces of the sensor and the substrate. Due to the advantages of the extremely stretchable ability, intrinsically strain sensors, i.e., elongation sensor and bending sensor, are further developed. It shows that, up to 178% strain could be measured by these stretchable sensors, and 74 m⁻¹ of curvature for the bending sensor. The proposed sensors also show excellent responses, less than 120 ms for steady, and without delay and flushness. The proposed intrinsically strain sensor provides an alternative way to construct new types of intelligent flexible electronics and artificial skins.

柔软且可伸缩的电子设备在“软机器人”、电子皮肤、假肢等不断发展的领域中发挥着重要作用。 作为可伸缩电子设备的基本单元之一，应变传感器在以往的研究中得到了广泛的研究，尽管大应变检测仍然是一个众所周知的挑战。本质上可拉伸的传感器可以根据可拉伸的矩阵承受较大的应变，近年来受到了很多关注。在这项研究中，我们将液态金属引入柔性基板的体积矩阵中，以构建一种新型的固有应变传感器，该传感器可以承受柔性基板的大应变，避免传感器和基板界面处的常规断裂失效。由于具有极强的伸缩能力的优点，进一步开发了固有应变传感器，即伸长率传感器和弯曲传感器。结果表明，这些可拉伸传感器可以测量高达 178% 的应变，而 74 m^-1弯曲传感器的曲率。所提出的传感器还显示出出色的响应，稳定小于 120 毫秒，并且没有延迟和冲洗。所提出的固有应变传感器为构建新型智能柔性电子设备和人造皮肤提供了一种替代方法。