Abstract
Polyvinylidene fluoride (PVDF) and AgNO3/PVDF composite piezoelectric fibers were prepared using near-field electrospinning technology. The prepared fibers are attached to the electrode sheet and encapsulated with polydimethylsiloxane to create an energy acquisition device and further fabricated into a dynamic sensing element. The addition of AgNO3 significantly increased the conductivity of the solution from 40.33 μS/cm to 883.59 μS/cm, which in turn made the fiber drawing condition smoother with the increase of high voltage electric field and reduced the fiber wire diameter size from 0.37 μm to 0.23 μm. The tapping test shows that the voltage signal can reach ~0.9 V at a frequency of 7 Hz, and the energy conversion efficiency is twice that of the PVDF output voltage. The addition of AgNO3 effectively enhances the molecular bonding ability, which effectively increases the piezoelectric constants of PVDF piezoelectric fibers. When the human body is exercised for a long period of time and the body is overloaded, the biceps muscle is found to produce 8 to 16 tremors/second through five arm flexion movements. The voltage output of the flexible dynamic soft sensor is between 0.7–0.9 V and shows an orderly alternating current waveform of voltage signals. The sensor can be used to detect muscle tremors after high-intensity training and to obtain advance information about changes in the symptoms of fasciculation, allowing for more accurate diagnosis and treatment.
Highlights
Licensee MDPI, Basel, Switzerland.From the industrial field to the smart home, sensors have changed the habits of people in the past, so these systems have become indispensable wearable devices in people’s lives.In the field of smart wear, sensors can be used to distinguish direction, navigation, and motion assistance, and they can measure, record, and analyze human activities anytime and anywhere, and even further analyze sleep quality
It can be seen that the viscosity of Polyvinylidene fluoride (PVDF) solution (18 wt%) decreased from 823.3 cP to 539.5 cP
The prepared fibers were attached to the electrode sheet and encapsulated with PDMS and further fabricated into a dynamic sensing element
Summary
Licensee MDPI, Basel, Switzerland.From the industrial field to the smart home, sensors have changed the habits of people in the past, so these systems have become indispensable wearable devices in people’s lives.In the field of smart wear, sensors can be used to distinguish direction, navigation, and motion assistance, and they can measure, record, and analyze human activities anytime and anywhere, and even further analyze sleep quality. From the industrial field to the smart home, sensors have changed the habits of people in the past, so these systems have become indispensable wearable devices in people’s lives. There are several types of pressure sensors on the market today, including capacitive sensors [1,2], resistive sensors [3,4], piezoelectric sensors [5,6], and piezoresistive sensors [7,8]. These sensors provide an electrical signal output proportional to the measured pressure. In terms of sensor performance, the key specifications required for pressure sensors include linearity, hysteresis, temperature sensitivity, sensing size and pressure range [9]
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