The prolonged and continuous monitoring of mechanoacoustic heart signals is essential for the early diagnosis of cardiovascular diseases. These bodily acoustics have low intensity and low frequency, and measuring them continuously for long periods requires ultrasensitive, lightweight, gas-permeable mechanoacoustic sensors. Here, we present an all-nanofiber mechanoacoustic sensor, which exhibits a sensitivity as high as 10,050.6 mV Pa-1 in the low-frequency region (<500 Hz). The high sensitivity is achieved by the use of durable and ultrathin (2.5 µm) nanofiber electrode layers enabling a large vibration of the sensor during the application of sound waves. The sensor is ultralightweight, and the overall weight is as small as 5 mg or less. The devices are mechanically robust against bending, and show no degradation in performance even after 1,000-cycle bending. Finally, we demonstrate a continuous long-term (10 h) measurement of heart signals with a signal-to-noise ratio as high as 40.9 decibels (dB).

译文

长期和连续监测机械声学心脏信号对于心血管疾病的早期诊断至关重要。这些身体声学具有低强度和低频,并且长时间连续测量它们需要超灵敏,轻巧,透气的机械声学传感器。在这里,我们提出了一种全纳米纤维机械声传感器,该传感器在低频区域 (<500Hz) 表现出高达10,050.6 mV Pa-1的灵敏度。通过使用耐用且超薄 (2.5 µ m) 的纳米纤维电极层来实现高灵敏度,从而在声波施加期间能够使传感器产生较大的振动。传感器是超轻的,总重量小到5毫克或更少。该装置在机械上是抗弯曲的,并且即使在1,000循环弯曲之后也不会显示性能下降。最后,我们证明了对心脏信号的连续长期 (10 h) 测量,其信噪比高达40.9分贝 (dB)。

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