Microwave absorption properties of pyrolytic carbon nanofilm
1 Research Institute for Nuclear Problem, Belarus State University, 11 Bobruiskaya St., Minsk, 220030, Belarus
2 Department of Physics and Mathematics, University of Eastern Finland, P.O. Box 111, Joensuu, FI-80101, Finland
Nanoscale Research Letters 2013, 8:60 doi:10.1186/1556-276X-8-60Published: 7 February 2013
We analyzed the electromagnetic (EM) shielding effectiveness in the Ka band (26 to 37 GHz) of highly amorphous nanometrically thin pyrolytic carbon (PyC) films with lateral dimensions of 7.2 × 3.4 mm2, which consists of randomly oriented and intertwined graphene flakes with a typical size of a few nanometers. We discovered that the manufactured PyC films, whose thickness is thousand times less than the skin depth of conventional metals, provide a reasonably high EM attenuation. The latter is caused by absorption losses that can be as high as 38% to 20% in the microwave frequency range. Being semi-transparent in visible and infrared spectral ranges and highly conductive at room temperature, PyC films emerge as a promising material for manufacturing ultrathin microwave (e.g., Ka band) filters and shields.