Liquid Metal@Reduced\nGraphene Oxide Composite Putty\nfor Microwave Absorption

Abstract

The development of radar technology has increased the\npossibility\nof warplanes being detected. Therefore, radar stealth capability is\ncritical for warplanes. Currently, microwave-absorbing materials with\nplasticity are urgently needed to reduce the strong electromagnetic\nscattering from plenty of small gaps on aircraft. Here, we propose\na strategy to encapsulate liquid metal with reduced graphene oxide\n(rGO) to form a plastic microwave-absorbing putty. The putty is formed\nby a self-assembly electrostatic method to create a sparse foam structure\nwith good plasticity. Interestingly, the nonmagnetic putty not only\nshows a dielectric loss but also exhibits unique magnetic losses.\nThis synergistic mechanism allows the putty to obtain a minimum reflection\n(RL_min) of −58.86 dB at 8.93 GHz with a small thickness\nof 3.57 mm. The excellent properties of this composite putty allow\nit to be a candidate for microwave-absorbing putties to reduce the\nradar cross section of airplanes.