GREEN SYNTHESIS OF GRAPHENE-BASED AEROGELS FOR ULTRA-HIGH-CAPACITY ELECTROMAGNETIC INTERFERENCE SHIELDING
DOI:
https://doi.org/10.71146/kjmr905Keywords:
Graphene aerogel, green synthesis, EMI shielding, Camellia sinensis (green tea) extractAbstract
The design of lighter and more efficient EMIs shielding materials is becoming more critical than ever in current times. In this paper, we report an environmental-friendly approach to the fabrication of reduced graphene oxide (rGO) aerogel via the use of Camellia sinensis (green tea) leaves as a bio-reductant. The polyphenolic extracts reduce the oxygen-containing functional groups from the surface of graphene oxide allowing self-assembled formation of three-dimensional porous structure without any hazardous chemicals. The produced ultralightweight (5-20 mg/cm³) aerogels show high electrical conductivity up to 48.2 S/m and outstanding EMI shielding effectiveness between 50.5-72.4 dB in the X-band (8.2-12.4 GHz) with the dominance of the absorption process. The obtained specific EMI shielding effectiveness was about 2400 dB∙cm³/g. The performance was much higher compared to the commonly used metal foils and chemically reduced graphene composites.
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Copyright (c) 2026 Ghulam Qadir Samtio, Faheem Ahmed, Deedar Ali Jamro, Mir Muhammad, Zubeda Nangrejo, Zaheer Hussain Abbasi (Author)
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