Ultra‐light carbon nanotube sponge as an efficient electromagnetic shielding material in the GHz range |
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| Authors: | María Crespo María González Ana Laura Elías Lakshmy Pulickal Rajukumar Juan Baselga Mauricio Terrones Javier Pozuelo |
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| Institution: | 1. Departamento de Ciencia e Ingeniería de Materiales e Ingeniería Química (IAAB), Universidad Carlos III de Madrid, , Madrid, Spain;2. Department of Physics, Department of Chemistry, Department of Materials Science and Engineering, and Center for 2‐Dimensional and Layered Materials, Eberly College of Science, The Pennsylvania State University, 104 Davey Lab., University Park, PA 16802, USA |
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| Abstract: | 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 cm3 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) |
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| Keywords: | electromagnetic shielding carbon nanotubes sponges high dielectric losses |
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