Wang Qun, Yao Zhongwen, Zhang Changchao, Song Honglie, Ding Hanliang, Li Bo, Niu Shichao, Huang Xinguan, Chen Chuanhai, Han Zhiwu, Ren Luquan
Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun, Jilin, 130022, People's Republic of China.
Liaoning Academy of Materials, Liaoning, Shenyang, 110167, People's Republic of China.
Nanomicro Lett. 2023 Nov 20;16(1):26. doi: 10.1007/s40820-023-01250-y.
Flexible strain sensors are promising in sensing minuscule mechanical signals, and thereby widely used in various advanced fields. However, the effective integration of hypersensitivity and highly selective response into one flexible strain sensor remains a huge challenge. Herein, inspired by the hysteresis strategy of the scorpion slit receptor, a bio-inspired flexible strain sensor (BFSS) with parallel through-slit arrays is designed and fabricated. Specifically, BFSS consists of conductive monolayer graphene and viscoelastic styrene-isoprene-styrene block copolymer. Under the synergistic effect of the bio-inspired slit structures and flexible viscoelastic materials, BFSS can achieve both hypersensitivity and highly selective frequency response. Remarkably, the BFSS exhibits a high gage factor of 657.36, and a precise identification of vibration frequencies at a resolution of 0.2 Hz through undergoing different morphological changes to high-frequency vibration and low-frequency vibration. Moreover, the BFSS possesses a wide frequency detection range (103 Hz) and stable durability (1000 cycles). It can sense and recognize vibration signals with different characteristics, including the frequency, amplitude, and waveform. This work, which turns the hysteresis effect into a "treasure," can provide new design ideas for sensors for potential applications including human-computer interaction and health monitoring of mechanical equipment.
柔性应变传感器在感知微小机械信号方面具有广阔前景，因此被广泛应用于各种先进领域。然而，将超敏性和高选择性响应有效集成到一个柔性应变传感器中仍然是一个巨大的挑战。在此，受蝎子狭缝感受器的滞后策略启发，设计并制造了一种具有平行通缝阵列的仿生柔性应变传感器（BFSS）。具体而言，BFSS由导电单层石墨烯和粘弹性苯乙烯-异戊二烯-苯乙烯嵌段共聚物组成。在仿生狭缝结构和柔性粘弹性材料的协同作用下，BFSS能够实现超敏性和高选择性频率响应。值得注意的是，BFSS表现出657.36的高应变计因子，并且通过对高频振动和低频振动经历不同的形态变化，能够以0.2 Hz的分辨率精确识别振动频率。此外，BFSS具有宽频率检测范围（103 Hz）和稳定的耐久性（1000次循环）。它能够感知和识别具有不同特征的振动信号，包括频率、幅度和波形。这项将滞后效应转化为“宝藏”的工作，可以为包括人机交互和机械设备健康监测在内的潜在应用传感器提供新的设计思路。
