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首页> 外文期刊>Journal of Micromechanics and Microengineering >Highly-damped nanofiber mesh for ultrasensitive broadband acoustic flow detection
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Highly-damped nanofiber mesh for ultrasensitive broadband acoustic flow detection

机译：用于超敏宽带声学流量检测的高度阻尼纳米纤维网

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摘要

Many small animals have evolved ultrasensitive hearing capability by detecting acoustic flow with mechanosensory hair-like structures. The highly-damped hairy structures such as the fluffy mosquito antennae are driven to move by viscous forces in the fluctuating medium, in contrast to sensing acoustic pressure with tympanal membranes. Inspired by the acoustic flow sensing of animals, the highly-damped 2D nanofiber mesh is presented here for the ultrasensitive, broadband acoustic flow detection. By evaporating 90nm Au on a freestanding electrospun Poly(methyl methacrylate) (PMMA) nanofiber mesh, we fabricate a thin layer of conductive Au-PMMA nanomesh with dimensions 8 mm x 8 mm, with thickness of approximately 3 mu m and average fiber diameter around 430nm. The nanomesh is shown to move instantaneously with broadband fluctuating airflow near maximum physical efficiency from 100 Hz to 10 000 Hz, i.e. v(m)(esh)(t)/v(air)(t) approximate to 1, surpassing the frequency response and efficiency of previously-reported microscale hairy structures. By transducing the motion of the nanomesh with electromagnetic induction, we demonstrate fluctuating airflow detection with almost full fidelity in the measured frequency range. Sensing flow with highly-damped nanomaterials will benefit miniaturized flow measurement and sound detection, and provides an important application for the diverse flourishing nanomaterials, such as 1D nanofibers, 2D nanomeshes, and 3D nanolattices.
机译：许多小动物通过检测具有机械感毛样结构的声流，进化出了超灵敏的听觉能力。高阻尼的毛状结构，如蓬松的蚊子触角，由波动介质中的粘性力驱动移动，而不是用鼓膜感应声压。受动物声流传感的启发，高阻尼2D纳米纤维网被用于超灵敏、宽带声流检测。通过在独立式电纺聚甲基丙烯酸甲酯（PMMA）纳米纤维网上蒸发90nm的金，我们制备了一层尺寸为8mm x 8mm、厚度约3μm、平均纤维直径约430nm的导电金PMMA纳米网。纳米网格显示出瞬时移动，宽带波动气流接近最大物理效率，从100 Hz到10000 Hz，即v（m）（esh）（t）/v（空气）（t）接近1，超过了之前报道的微尺度毛发结构的频率响应和效率。通过电磁感应转换纳米网的运动，我们展示了在测量频率范围内几乎完全逼真的波动气流检测。利用高阻尼纳米材料传感流动将有利于小型化的流量测量和声音检测，并为各种蓬勃发展的纳米材料，如一维纳米纤维、二维纳米网格和三维纳米晶格提供了重要的应用。

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