Wide-frequency microwave absorption properties of CuO/Ag/carbon sphere composites

This letter reported that the CuO/Ag/carbon sphere (CACS) composites were synthesized by thermal oxidation Cu/Ag/carbon sphere composites. The results of scanning electron microscope images indicate that the diameter of the CACS composites is about 500 nm. The strongest reflectivity loss (RL) of the CACS composites was further enhanced to -20.01 dB (microwave absorption rate >90%) at 11.65 GHz, and the corresponding thickness in only 0.85 mm. The strong absorption of CACS composites is less than -5 dB and -10 dB over the range of 2.25-18.00 GHz (1.5 mm in thickness) and 6.99-17.91 GHz (0.85 mm in thickness), respectively. The CACS composites are believed to be ideal for making wide-frequency and strong absorption microwave absorbing materials. (C) 2015 Elsevier B.V. All rights reserved.