BIOINSPIRED, MICROWAVE-ABSORBING, COATING BASED ON CARBON HOLLOW SPHERES

摘要

Porous structures based on glasslike carbon, whether in the form of foams, periodic architectures, or gels, have attracted the attention of many researchers due to their outstanding combination of physical properties. Unlike most random carbon foams, for which it is still challenging to accurately control geometric parameters, hollow carbon spheres can be more easily tailored through a synthesis method based on well-calibrated sacrificial templates. This advantage turns such spheres into very interesting candidates for using them in electromagnetic applications. In particular, hollow spheres (HS) made of glasslike carbon with uniform diameter can be potentially used for producing ordered periodic structures. In this work, the electromagnetic properties of a system formed by a single layer of carbon HS packed in 2D were investigated. Its structure is similar to a well-known type of anti-reflective surfaces having a "moth-eye"-like structure [1-3]. In the present case, however, the HS monolayer is an electrically conductive material with losses; thus, due to these attractive properties, it may be used for electromagnetic (EM) absorption applications.