柔性压力传感器在水声低频检测和声学隐身方面的发展急需新机理和新材料的突破。本课题首次提出并阐明“种植”于水凝胶表层的图案化、可变形金属纳米粒子网络电极诱导双电层电容变化新机理，以及基于此原理设计构筑低频水声隐身探测器。以与水环境几乎完美匹配、无声阻抗界面的柔性水凝胶薄膜为基体，研究直接在其表层“种植”图案化金属纳米粒子网络电极的独创技术，通过灵敏地感应外界载荷引起的金属纳米粒子网络电极的变形，改变其形成双电层的面积，诱导电容值的改变，以此作为响应信号设计构筑可探测低频水声的水凝胶双电层电容探测器。建立可变形金属纳米粒子网络电极在不同频率载荷下的振动模型，并通过纳米-微米多尺度结构的精确调控预测、优化水凝胶器件的水声响应特性，阐明其电学信号的传导与转化机制，揭示纳米粒子的形貌和尺寸、图案化结构、水凝胶的性能与水声检测之间的构效关系。为柔性声学隐身低频水声检测提供新机理、新材料

The development of flexible pressure sensor in underwater low frequency acoustic detection and acoustic stealth is in urgent need which calls for novel mechanism and new material. In this project, a novel mechanism that deformable metal nano-network electrodes patterned on the surface of hydrogel films can induce the capacitance change of electric double layer (EDL) is first proposed, and the stealth flexible acoustic detector based on this mechanism are designed. Hydrogel, which have perfect match with water environment with negligible acoustic impedance, is used as substrate. Patterned deformable nanonetwork electrode is directly "planted" into the surface layer of hydrogel films.By sensitively responding the deformation of the metal nano-network electrodes under pressure, capacitor change can be induced via changing the EDL area on the nano-network electrodes. Accordingly, flexible acoustic stealth hydrogel-based acoustic detector can be constructed by responding the signal of capacitor change. The response characteristics of the hydrogel devices will be forecasted through the establishment of vibration model of deformable nanonetwork electrode under pressure loading with different frequency, and be optimized via accurately controlling the nano-/micro- multi-scale structures of the deformable nanonetwork electrodes. By further studying the mechanism of the signal transmission and transformation in hydrogel devices, the relationship between acoustic detecting ability and the microstructure and surface pattern of deformable nanonetwork electrodes, as well as physical and chemical properties of hydrogels will be finally revealed. The research will provide novel mechanism, new materials and technology for developing flexible stealth acoustic detector which is suitable for low frequency acoustic detection.