Ultrasensitive shape memory strain sensor with tunable sensitivity and selectivity
발표자
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초록
내용
Bio-inspired sensors, especially crack-based strain sensors, have attracted intense research interests for applications in diverse fields due to high mechano-sensitivity. However, previous sensors based on randomly distributed cracks have limited sensitivity, reproducibility, and versatility in diverse applications. Here, inspired by the mechanosensory system of a spider, we demonstrate an ultra-sensitive and shape-reconfigurable smart strain sensor based on the precise control of nano crack formation. We introduce a nanoscale line pattern to form parallel nano cracks and the shape memory polymer for shape reconfiguration. As a result. it shows an ultra-high gauge factor of 2.23 × 109 at 2% strains at the initial state and it covers a wide range of frequencies (100 Hz – 20 kHz) and shows a rapid response time of 0.025 ms at high acoustic frequencies (20 kHz) in the reconfigured state. Therefore, only one sensor is required to detect various types of stimuli at the most optimized state.