| 초록 |
A high-performance polyvinylidene fluoride (PVDF)-based acoustic actuator for bass frequencies was successfully fabricated. High concentrations of Ba-doped SiO2/TiO2 hollow nanoparticles (Ba–HNPs) were embedded into PVDF fibers at large-scale via electrospinning, enhancing the β phase content and the dielectric property of the pristine PVDF matrix. A chemical vapor deposition (CVD)-grown graphene electrode attached to a silane-treated surface of a Ba–HNPs/PVDF thin film enabled high electron mobility and the ability to deliver distortion-free acoustic signals. The frequency response of the synthesized acoustic actuator was studied as a function of the Ba–HNPs content, film thickness, and type of electrode. The optimized thickness of the PVDF-based thin film was ca. 80 μm. The outstanding conductivity of the graphene electrode provided a ca. 57 % and a ca. 29 % enhancement of the frequency response in the middle and treble ranges, respectively. Addition of 15 wt% of Ba–HNPs led to a 60 % increase in frequency response and a 21 % improvement in total harmonic distortion (THD) at bass frequencies. |
