Electrospinning-Based High-Sensitive Pvdf-Trfe Nanofibre Sensor With Sensitivity Dependence on Pore Diameter

Electrospinning-based nanofibre sensor of polyvinylidene fluoride-co-trifluoroethylene (PVDF-TrFE) was fabricated with versatile pore diameter, shape and size for assessment to be used in a wide range of biomedical applications. In this study, nanofibre film of PVDF-TrFE copolymers along with a sandwich of aluminium and copper acts as an electrode of the sensor, exhibiting strong acoustic to electricity conversion ability within the audible frequency range 20 Hz– 20 kHz. Sensitivity of the sensor was observed to effectively change from 0.5 to 12 VPa^–1 with change in pore diameter from 220 to 280 nm of the nanofibres. Besides, cardiac response within the frequency range 0.05–120 Hz at 0 dB was detected using this sensor with a sensitivity of 10 mV. The fabricated polymer sensor of 250 nm fibre pore diameter exhibited sensitivity as high as 10 VPa^–1 at 120 Hz incident frequency of audible sound under a specially arranged sensing assembly, where convergent sound directly impacted on the nanofibre layer. The high-sensitive materials can make a significant contribution in cardiac and audiometric device fabrication.