Enhanced sound absorption properties of porous ceramics modified by graphene oxide films.

Under the condition of constant thickness, improving the low‐frequency sound absorption performance of conventional sound‐absorbing materials is a challenging research topic. To address this issue, a new reduced graphene oxide/polyvinyl alcohol (RGO/PVA) porous composite ceramic was fabricated using freeze‐drying and optimized by redesigning the internal connecting pores of porous ceramic matrixes with a reticular microstructure using RGO and PVA. The as‐prepared porous structure showed significant enhancement in the low‐frequency sound absorption band compared with pristine porous ceramics. In addition, the hybrid porous ceramics exhibited low thermal conductivity. These favorable properties indicate that the hybrid sound‐absorbing ceramics have potential application prospects for noise reduction in the fields of construction and electrical and mechanical devices. [ABSTRACT FROM AUTHOR]