Abstract
In this work, ultralight polymer-derived ceramic aerogels (PDCA) were prepared by a facile method of hydrosilylation crosslink and freeze drying. The electromagnetic absorption properties of ultralight PDCA were investigated for the first time. The PDCA pyrolyzed at 1000°C shows a uniform three-dimensional (3D) framework with a low bulk density of ∼0.19g/cm3 and high surface area of 134.48m2/g. The electromagnetic properties of PDCA were characterized by a vector network analyzer. The minimum reflection and absorption bandwidth of PDCA pyrolyzed at 1000°C, 1200°C and 1400°C are −43.37dB @ 7.6GHz, −42.01 dB@12.5GHz, and −31.69 dB@17.3GHz and 3.8GHz, 6.6GHz and 4.2GHz, respectively, at the frequency range of 2–18GHz. The strong electromagnetic absorption and wide bandwidth features of PDCA could be attributed to the multiple reflections of microwaves in the 3D framework, as well as the high dielectric loss and proper conductivity.
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