Effective terahertz shielding properties of extreme graphene-silver nanowire surfaces investigated by nanoprobing

iScience

Sung Jun Kim¹  Dai-Sik Kim²  Yeeun Roh³  Sang Woo Kim⁴  Minah Seo⁵  Sang-Hun Lee⁶  Geon Lee⁶ 

[1] Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea;Display and Nano System Laboratory, School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea;Clean Energy Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea;Department of Optical Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk 39177, Republic of Korea;Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea;Sensor System Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea;

关键词: Physics;    Radiation physics;    Nanotechnology;   

DOI  :  

来源: DOAJ

【 摘 要 】

Summary: In the terahertz (THz) electromagnetic wave regime, which has recently received great attention in the fields of communication and security, shielding of THz waves is a significant issue. Therefore, carbon-based nanostructures or polymer–carbon nanocomposites have been widely explored. Herein, significantly enhanced THz shielding efficiency is reported for silver nanowires coated with reduced graphene oxide (rGO) and nanoscale THz metamaterials, as compared to the cases without nanoscale metamaterials. Using a nanoslot-patterned metamaterial with strong resonances at certain frequencies, THz transmission in intensity is enhanced up to three orders of magnitude. Enhanced transmission by nanopatterns substantially increases the shielding performance to the external THz waves, even for ultrathin films (several tens of nanometers) produced by a simple spray of rGO (a few nm of flakes) on a complex random nanowire network. Excellent shielding performance is presented and the shielding mechanism is investigated by the nanoprobing configuration at the same time.

【 授权许可】

Unknown