Advances in transparent and stretchable strain sensors

Stretchable strain sensors have received intensive attention recently due to their widespread potentials in the fields of healthcare monitoring, soft robotics, and electronic skin. Besides high stretchability and excellent sensing properties, the transparency of the sensor is another important parameter when designing multi-functional sensors in reality. In this review paper, we mainly focused on the different strategies to realize the transparency of stretchable strain sensor. Some typical advances in different types of stretchable and transparent strain sensors as well as their mechanisms, sensing properties, and applications are summarized. Finally, the open question and possible solution in this field have also been showcased.