Abstract: Flexible pressure sensors have excellent prospects in applications of human-machine interfaces, artificial intelligence and human health monitoring due to their bendable and lightweight characteristics compared to rigid pressure sensors. However, arising from the limited compressibility of soft materials and the hardening of microstructures at the device interface, there is always a trade-off between high sensitivity and broad sensing range for most flexible pressure sensors, which results in a gradual saturation response and limits their practical applications. Herein, inspired by the distinct pressure perception function of crocodile receptors, a highly sensitive and wide-range flexible pressure sensor with multiscale microdomes and interlocked architecture is developed via a facile PS-decorated molding method. Combined with interlocked architecture, the multiscale dome-shaped structured interface enhances the compressibility of the material through structural complementarity, increases the contact area between functional materials, which compensates for the stiffness induced by the deformation of dense microscale columns. This effectively mitigates structural hardening across a wide pressure range, leading to the overall high performance of the sensor. As a result, the obtained sensor exhibits a low detection limit of 5 Pa, a high sensitivity of 6.14 kPa^??1, a wide measurement range up to 231 kPa, short response/recovery time of 56 ms/69 ms, outstanding stability over 10,000 cycles. Considering these excellent properties, the sensor shows promising potential in health monitoring, human-computer interaction, wearable electronics. This study presents a strategy for the fabrication of flexible pressure sensors exhibiting high sensitivity and a wide pressure response range.

Key words: Biomimetic engineering')">Biomimetic engineering, Flexible pressure sensors, Ultrahigh sensitivity and wide-range detection, Multiscale interface, Interlocked structure