In this work, we have developed PVDF-TrFE/BaTiO3 composite thin film-based highly sensitive ultrasound (US) and photoacoustic (PA) transducer. The synthesized nanocomposite polymer-based sensor film has been grown layer by layer on the flat surface of a 9.00 mm diameter aluminum substrate. The fabricated transducer has been tested in pulse-eco mode and it shows high sensitivity with a peak-to-peak voltage 800 mV. Preliminary US and PA experiments have been performed with the aluminum block and multi-layer ink coated phantom. The central frequency of the obtained acoustic signal was found to be 44 MHz with an acoustic bandwidth of 32 MHz (72% of central frequency at -6 dB). The PA signals have been detected with the fabricated transducer and the estimated frequency spectrum shows multiple sub-band central frequencies varying from 17 MHz to 55 MHz. Due to its high sensitivity and broad bandwidth, the developed transducer can be used for high-resolution US and PA microscope imaging (PAI).
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