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

:长期持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。这些人体声学具有低强度和低频率,并且长时间连续测量它们需要超灵敏,轻巧,透气的机械声传感器。在这里,我们介绍了一种全纳米纤维机械声传感器,它在低频区域(<500 Hz)中具有高达10,050.6 mV Pa-1的灵敏度。通过使用耐用的超薄(2.5 µm)纳米纤维电极层,可以实现高灵敏度,从而在施加声波时使传感器产生较大的振动。该传感器超轻,总重量小至5 mg或更小。该器件具有抗弯曲的机械坚固性,即使经过1000次循环弯曲也不会表现出性能下降。最后,我们演示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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