title: Microwave absorption properties of pyrolytic carbon nanofilm.
abstract: 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.
authors: Department of Physics and Mathematics, University of Eastern Finland, P,O, Box 111, Joensuu, FI-80101, Finland. tommi.kaplas@uef.fil.
authors: Polina P
authors: PP
authors: Kuzhir
authors: Alesya G
authors: AG
authors: Paddubskaya
authors: Sergey A
authors: SA
authors: Maksimenko
authors: Tommi
authors: T
authors: Kaplas
authors: Yuri
authors: Y
authors: Svirko
references: Nano Lett. 2009 Dec;9(12):4031-6
references: 19780528
references: ACS Nano. 2010 May 25;4(5):2713-20
references: 20384321