Microwave shielding of transparent and conducting single-walled carbon nanotube films

Abstract

The authors measured the transport properties of single-walled carbon nanotube (SWCNT) films in the microwave frequency range from 10MHzto30GHz by using the Corbino reflection technique from temperatures of 20–400K. Based on the real and imaginary parts of the microwave conductivity, they calculated the shielding effectiveness for various film thicknesses. Shielding effectiveness of 43dB at 10MHz and 28dB at 10GHz are found for films with 90% optical transmittance, which suggests that SWCNT films are promising as a type of transparent microwave shielding material. By combining their data with those from the literature, the conductivity of SWCNT films was established in a broad frequency range from dc to visible.