| 【文章摘要】 This study introduces a cost-effective and eco-efficient method for fabricating an advanced microwave absorber using a layer-by-layer rGO and SiO_2 structure. The rGO/SiO_2 composite, synthesized via modified Hummer's and Stober methods, demonstrates remarkable microwave absorption properties. The resultant porous structure, characterized by an S_(BET) of 294.89 m~2/g, enables multiple refections and scatterings of electromagnetic waves. At a sample thickness of 3.8 mm, the material achieves a refection loss (RL) of 47.43 dB at 12.56 GHz and an effective absorption bandwidth (EAB) of 11.04 GHz. For a 6 mm thick sample, an exceptionally high EAB of 12.72 GHz is observed, maintaining a high RL of 42.32 dB. These results demonstrate that the rGO/SiO_2 material is a promising candidate for applications in electromagnetic wave absorption, offering a simple, scalable solution for mitigating electromagnetic pollution and enhancing military stealth technologies. |