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Ultra‐light carbon nanotube sponge as an efficient electromagnetic shielding material in the GHz range
Author(s) -
Crespo María,
González María,
Elías Ana Laura,
Pulickal Rajukumar Lakshmy,
Baselga Juan,
Terrones Mauricio,
Pozuelo Javier
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201409151
Subject(s) - electromagnetic shielding , materials science , microwave , reflection loss , absorption (acoustics) , carbon nanotube , sponge , composite material , electromagnetic radiation , reflection (computer programming) , nanometre , optoelectronics , optics , telecommunications , composite number , computer science , botany , physics , biology , programming language
CVD synthesised CNT flexible sponge with density lower than 0.02 g cm –3 has been found to serve as high performance EMI shielding material without the aid of any polymer infiltration or impregnation. Due to its extreme lightweight, the specific SE of the CNT‐sponge was found to be as high as 1100 dB cm 3 g –1 , having a total SE above 20 dB in the whole 1–18 GHz range, and being able to shield by absorption. The material is the best of our knowledge this specific SE value appears to be the highest reported hitherto. Improved EM absorbers should fulfil the synergic requirements of being low reflective and highly absorptive. In our CNT‐sponges this condition is not satisfied because, although their net absorption ability is strongly remarkable, their high electrical conductivity favours the wave to be reflected at the input interface. Therefore, this sponge material would have a great potential for microwave‐frequency applications that need negligible reflection and great absorption when combined in a multilayered structure that could prevent the wave to be reflected at the input interface. (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)