PVDF-Bi2O3 Composite Film Synthesis for Fabricating High Frequency Ultrasound Sensors
摘要
We have demonstrated a cost effective way to fabricate ultrasound transducers using PVDF and Bi2O3 based polymer-ceramic composite. The nanofiller is widely used for enhancing the overall piezo-properties of the polymers. The composite sensor film was fabricated on the aluminum substrate using a drop casting method. FTIR spectroscopy data are analyzed to optimize the functionality of the composite sensor film. The central acoustic frequency of the fabricated transducer in pulsing mode is found to be 14 MHz and bandwidth found to be 18 MHz i.e., 128% of central frequency at −6 dB. The photoacoustic signal is measured and found that the central frequency of the fabricated transducer is 13.5 MHz and bandwidth found to be 13 MHz i.e., 96.2% of central frequency at −6 dB. Due to its high frequency and large bandwidth, the transducer is suitable for nondestructive testing and photoacoustic imaging.