PEDOT:PSS-based three-dimensional lamella network for high-performance sound absorption and heat transfer

초록

Human health is seriously threatened by noise from various sources. Recently, the development of ultra-high-speed motors has caused not only high-frequency noise but also temperature rise problems due to high-speed operation of the device. To remedy this, research into materials that not only block noise over a wide frequency range but also quickly release the frictional heat generated from noise blocking is becoming important. In this work, we fabricated a three-dimensional lamellar structure with excellent sound absorption and thermal conductivity by using the PEDOT:PSS solution wetting process and the DMSO annealing method as the base material of the porous melamine foam. The 3D lamellar structure has excellent sound absorption properties over a wide frequency range (250-6300 Hz) and exhibits a sound absorption coefficient of 0.91 at 4000 Hz where the person is sensitive. In addition, due to the PEDOT:PSS-coated thin film rearranged by DMSO, it has a higher thermal conductivity (0.225 W m(-1) K-1) than melamine foam (0.033 W m(-1) K-1). The three-dimensional lamellar structure formed from the PEDOT:PSS not only blocks the movement of sound waves but also promotes the mean free path of the phonons. In addition, the material also shows good structural stability and elastic recovery, showing the same compression-deformation stress after 500 repeated strains. Therefore, this material will be applied to soundproofing materials in the ultra-high-speed electric devices to enable high quietness and stable operation of the equipment. [GRAPHICS]

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