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High-sensitivity acoustic sensors from nanofibre webs

View Article: PubMed Central - PubMed

ABSTRACT

Considerable interest has been devoted to converting mechanical energy into electricity using polymer nanofibres. In particular, piezoelectric nanofibres produced by electrospinning have shown remarkable mechanical energy-to-electricity conversion ability. However, there is little data for the acoustic-to-electric conversion of electrospun nanofibres. Here we show that electrospun piezoelectric nanofibre webs have a strong acoustic-to-electric conversion ability. Using poly(vinylidene fluoride) as a model polymer and a sensor device that transfers sound directly to the nanofibre layer, we show that the sensor devices can detect low-frequency sound with a sensitivity as high as 266 mV Pa−1. They can precisely distinguish sound waves in low to middle frequency region. These features make them especially suitable for noise detection. Our nanofibre device has more than five times higher sensitivity than a commercial piezoelectric poly(vinylidene fluoride) film device. Electrospun piezoelectric nanofibres may be useful for developing high-performance acoustic sensors.

No MeSH data available.


Vibration velocity and proposed piezoelectric conversion mechanism.Vibration velocity of PVDF nanofibre web and commercial PVDF piezoelectric film in the central part at (a) different SPLs and (b) different sound frequencies (SPL, 85 dB), (c) proposed sound vibration modes and piezoelectric conversion mechanism for the nanofibre device (the error bars represent the s.d. obtained from the test results of at least three replicates).
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f4: Vibration velocity and proposed piezoelectric conversion mechanism.Vibration velocity of PVDF nanofibre web and commercial PVDF piezoelectric film in the central part at (a) different SPLs and (b) different sound frequencies (SPL, 85 dB), (c) proposed sound vibration modes and piezoelectric conversion mechanism for the nanofibre device (the error bars represent the s.d. obtained from the test results of at least three replicates).

Mentions: The vibration velocity of our PVDF nanofibre web and a commercial piezoelectric PVDF film (both 40 μm in thickness) in the central part of the hole was measured at different SPLs. As shown in Fig. 4a, when the SPL increased from 60 to 90 dB, the nanofibre web vibration velocity increased. However, the vibration velocity was stabilized at a constant level when the SPL increased to the range of 90–115 dB, suggesting the saturated vibration state under sound. In comparison, the commercial PVDF film showed a completely different vibration feature under sound. The film showed almost no vibration when the SPL was below 85 dB. However, the vibration increased gradually to the same level of the nanofibre web, when the SPL increased to 115 dB. Figure 4b shows the effect of acoustic wave frequency on the vibration of the nanofibre web and the commercial PVDF film. At 85 dB, the nanofibre web had stronger vibration than the PVDF film when the sound wave frequency was below 800 Hz, and the vibration at higher sound wave frequencies was equally weak.


High-sensitivity acoustic sensors from nanofibre webs
Vibration velocity and proposed piezoelectric conversion mechanism.Vibration velocity of PVDF nanofibre web and commercial PVDF piezoelectric film in the central part at (a) different SPLs and (b) different sound frequencies (SPL, 85 dB), (c) proposed sound vibration modes and piezoelectric conversion mechanism for the nanofibre device (the error bars represent the s.d. obtained from the test results of at least three replicates).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4814578&req=5

f4: Vibration velocity and proposed piezoelectric conversion mechanism.Vibration velocity of PVDF nanofibre web and commercial PVDF piezoelectric film in the central part at (a) different SPLs and (b) different sound frequencies (SPL, 85 dB), (c) proposed sound vibration modes and piezoelectric conversion mechanism for the nanofibre device (the error bars represent the s.d. obtained from the test results of at least three replicates).
Mentions: The vibration velocity of our PVDF nanofibre web and a commercial piezoelectric PVDF film (both 40 μm in thickness) in the central part of the hole was measured at different SPLs. As shown in Fig. 4a, when the SPL increased from 60 to 90 dB, the nanofibre web vibration velocity increased. However, the vibration velocity was stabilized at a constant level when the SPL increased to the range of 90–115 dB, suggesting the saturated vibration state under sound. In comparison, the commercial PVDF film showed a completely different vibration feature under sound. The film showed almost no vibration when the SPL was below 85 dB. However, the vibration increased gradually to the same level of the nanofibre web, when the SPL increased to 115 dB. Figure 4b shows the effect of acoustic wave frequency on the vibration of the nanofibre web and the commercial PVDF film. At 85 dB, the nanofibre web had stronger vibration than the PVDF film when the sound wave frequency was below 800 Hz, and the vibration at higher sound wave frequencies was equally weak.

View Article: PubMed Central - PubMed

ABSTRACT

Considerable interest has been devoted to converting mechanical energy into electricity using polymer nanofibres. In particular, piezoelectric nanofibres produced by electrospinning have shown remarkable mechanical energy-to-electricity conversion ability. However, there is little data for the acoustic-to-electric conversion of electrospun nanofibres. Here we show that electrospun piezoelectric nanofibre webs have a strong acoustic-to-electric conversion ability. Using poly(vinylidene fluoride) as a model polymer and a sensor device that transfers sound directly to the nanofibre layer, we show that the sensor devices can detect low-frequency sound with a sensitivity as high as 266 mV Pa−1. They can precisely distinguish sound waves in low to middle frequency region. These features make them especially suitable for noise detection. Our nanofibre device has more than five times higher sensitivity than a commercial piezoelectric poly(vinylidene fluoride) film device. Electrospun piezoelectric nanofibres may be useful for developing high-performance acoustic sensors.

No MeSH data available.