Yang Chengxiu, Hu Jiafei, Liu Lihui, Wu Shaowei, Pan Mengchun, Liu Yan, Wang Haomiao, Li Peisen, Zhang Qi, Qiu Weicheng, Luo Huihui
College of Intelligence Science and Technology, National University of Defense Technology, Changsha, 410073 China.
Microsyst Nanoeng. 2024 Mar 22;10:41. doi: 10.1038/s41378-024-00675-8. eCollection 2024.
The perception of fish locomotion is important for understanding their adaptive behaviors and ethological characteristics. However, the main strategy used for extracting fish attitudes involves the use of a vision-based monitoring system, which is limited in its range of observation and cannot perform tracking for long times. Here, we report the use of a wearable tagging electronic device, referred to as an underwater vest, to capture the surrounding flow field disturbances triggered by swimming or momentary postural changes. All of these goals were achieved by integrating a pair of pseudocapacitive pressure-sensing units and a flexible circuit board. Notably, additional conditions, such as variable hydraulic pressures and minimal changes in fish posture, require high stability and sensitivity of the sensing units. Thus, hybrid hydrogel electrodes were developed through cross-linking MXene with holey-reduced graphene oxide nanosheets and further modification with 1-ethyl-3-methylimidazolium dicyanamide ionic liquids, which increased the interfacial capacitance and long-term interfacial activity of the MXene. Consequently, the sensing unit exhibited ultrahigh sensitivity (~136,207 kPa) in an aquatic environment for 60 days and superior high-pressure resolution (10 Pa) within a wide working range of 1 MPa. Ultimately, an underwater vest integrated with such sensing units clearly distinguished and recorded fish locomotion. We believe that the designed device may open avenues in flow field monitoring and ocean current detection and provide new insights into the development of sensitive underwater tagging.
对鱼类运动的感知对于理解它们的适应性行为和行为学特征至关重要。然而，用于提取鱼类姿态的主要策略涉及使用基于视觉的监测系统，该系统在观察范围上有限，并且不能长时间进行跟踪。在这里，我们报告了使用一种可穿戴标记电子设备，即水下背心，来捕捉由游泳或瞬间姿势变化引发的周围流场干扰。所有这些目标都是通过集成一对赝电容式压力传感单元和一个柔性电路板来实现的。值得注意的是，诸如可变水压和鱼类姿势的最小变化等附加条件要求传感单元具有高稳定性和灵敏度。因此，通过将MXene与多孔还原氧化石墨烯纳米片交联并进一步用1-乙基-3-甲基咪唑二氰胺离子液体进行改性，开发了混合水凝胶电极，这增加了MXene的界面电容和长期界面活性。因此，传感单元在水生环境中60天内表现出超高灵敏度（~136,207 kPa），并在1 MPa的宽工作范围内具有优异的高压分辨率（10 Pa）。最终，集成了这种传感单元的水下背心能够清晰地区分和记录鱼类运动。我们相信，所设计的设备可能会为流场监测和洋流检测开辟道路，并为灵敏的水下标记的发展提供新的见解。
