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Title: | Ultra-light-weight microwave X-band EMI shielding or RAM material made from sustainable pyrolysed cork templates |
Authors: | Pullar, R C Novais, R M Caetano, A P F Krishnakumar, K A Surendran, K P |
Issue Date: | 29-Sep-2023 |
Publisher: | Royal Society of Chemistry |
Citation: | Nanoscale; 15(39):15982–15993 |
Abstract: | Cork is a renewable and sustainable material, highly porous and lightweight. We valorised waste cork and recycled wine stoppers to make pyrolysed/carbonised solid cork, for use as economic and sustainable microwave (MW) absorbers at the microwave X-band (8–12 GHz), without binder or additives. Although cork is already a very lightweight material (0.16 g cm−3), the pyrolysed cork is five-times less dense at 0.031 g cm−3, was amorphous graphitic carbon, and had an excellent shielding effectiveness (SET) of −18 to −38 dB, depending on thickness, with attenuation of the electromagnetic energy through internal reflection within the cellular cork structure. Furthermore, this ultra-light-weight material has an extremely high MW specific shielding effectiveness or efficiency (SSE), between −640 to −1235 dB g−1 cm3 over the entire X-band range, depending on thickness (3.0–8.6 mm), one of the highest reported for any pure carbon material, this upper value being more than twice that of any previously reported graphite-based foams. |
URI: | https://pubs.rsc.org/en/content/articlelanding/2023/NR/D3NR04411D http://localhost:8080/xmlui/handle/123456789/4612 |
Appears in Collections: | 2023 |
Files in This Item:
File | Description | Size | Format | |
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Ultra-light-weight microwave X-band EMI_PullarRC_Nanoscale.pdf Restricted Access | 4.63 MB | Adobe PDF | View/Open Request a copy |
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