关键字：Foams;Bandwidth - Carbon - Circular waveguides - Dielectric losses - Electromagnetic wave absorption - Electromagnetic waves - Fish - Iron oxides - Magnetite - Nanospheres

摘要：Fabricating of bio-derived electromagnetic wave absorbing materials has become hotspot. However, many bio-derived absorbers still suffer from thicker matching thickness limiting their application. Herein, porous carbon foams derived from fish skin have been synthesized through a simple hydrothermal method for the first time. Then Fe<inf>3</inf>O<inf>4</inf> nanospheres with diameter of 30 nm were uniformly imbedded into the carbon matrix via refluxing and annealing treatment. By controlling the precursor ratio of Fe(NO<inf>3</inf>)<inf>3</inf>&middot;9H<inf>2</inf>O and carbon, optimized microstructure and component can be easily realized. As expected, the novel Fe<inf>3</inf>O<inf>4</inf>/C foams show outstanding electromagnetic wave absorption performance compared with single carbon foams. When the loading filler ratio was 25 wt%, the minimum RL value of FC-3 can reach &minus;47.3 dB with a small matching thickness of 1.9 mm. Moreover, the effective absorption bandwidth was 5.68 GHz (12.16&ndash;17.84 GHz) with the thickness of 2.2 mm. The thin matching thickness could ascribe to the addition of Fe<inf>3</inf>O<inf>4</inf> nanospheres which could introduce more dielectric loss and magnetic loss. Moreover, the matching thickness of FC-3 is much thinner than other reported bio-derived materials. This investigation could be a perspective paving for the fabrication and mechanism research of electromagnetic wave absorber derived from animal organs.<br/> &copy; 2019 Elsevier Ltd

卷号：127

是否译文：否