Journal
APPLIED SURFACE SCIENCE
Volume 491, Issue -, Pages 616-623Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.06.107
Keywords
Graphene foam; Bacillus subtilis; Flexible film; Low density; EMI shielding
Categories
Funding
- National Natural Science Foundation of China [61605237, 11474310]
- Military Commission Logistics Department [BY117J013]
- State Key Program of National Natural Science Foundation of China [61734008]
- Jiangsu Province Postdoctoral Research Funding Scheme [2018K158C]
- Jiangsu Province [BE2016006-3, BK20150366, BK20150367, 1501131B, SYG201629]
- Project of Suzhou City [BE2016006-3, BK20150366, BK20150367, 1501131B, SYG201629]
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The rapid advancement of electromagnetic appliances in daily life has caused a serious problem of electromagnetic interference (EMI). The demand of efficient materials for the shielding of electromagnetic waves is increasing day by day. Here, we report the assembly of Bacillus subtilis-modified graphene foam (BS-GF) with ultralight weight, significant flexibility and remarkable EMI shielding effectiveness (SE). BS-GF with a thickness of 1 mm and density of 0.18 g cm(-3) shows a total EMI-SE of 56 dB in the 8-12 GHz band, and the specific EMI-SE reaches as high as 311 dB cm(3) g(-1). After folded 5000 times along the central axis, the sample does not show any significant reduction in EMI-SE. These excellent properties come from the light core-shell structure of the bacterial combined with GF, as well as the electrical loss due to GF architecture and the chiral absorbing ability of biomolecules such as DNA in the Bacillus subtilis (BS). The outcomes light the way to large-scale preparation of environmentally friendly and efficient EMI absorbents utilizing the microorganism as precursors.
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