Research and Application of Photoacoustic Transducer Based on MWCNT-MoS₂-PDMS Composite Thin Film Layer

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Photoacoustic transducers possess advantages such as high sensitivity, small size, and immunity to electromagnetic interference. However, traditional photothermal conversion materials, such as perovskite halides, although excellent in conversion efficiency, have toxic properties that limit their use in medical applications. In this study, we propose a novel photoacoustic transducer based on a composite thin film of multi-walled carbon nanotubes (MWCNTs) and molybdenum disulfide (MoS 2 ) embedded in polydimethylsiloxane (PDMS), leveraging the photothermal conversion and thermal conductivity properties of MWCNTs and MoS 2 . We conducted an in-depth analysis of the key factors influencing the sound pressure and bandwidth of the photoacoustic transducer, followed by a detailed comparative test of the amplitude and bandwidth of the ultrasonic signals. The results indicate that the ultrasound transducer based on the MWCNT-MoS 2 -PDMS composite film exhibits significant advantages in terms of light absorption, ultrasound amplitude, and spectral energy concentration. The new transducer achieved a maximum sound pressure intensity of 0.75 MPa, significantly improving ultrasound conversion efficiency, with a bandwidth of approximately 5–6 MHz, meeting the requirements of all-optical ultrasound detection systems. This study not only addresses the toxicity issues of traditional photothermal conversion materials, but also achieves high sound pressure intensity and wide bandwidth, offering a new solution for the development of all-optical ultrasound medical endoscopic imaging technology, and opening new directions for future research and applications.