Journal
ADVANCED ENGINEERING MATERIALS
Volume 23, Issue 12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.202100548
Keywords
cellulose hybrid paper and fabrics; dip-dry coating; electrothermal properties; electromagnetic interference shielding; MXene
Categories
Funding
- Industrial Strategic Technology Development Program [20007862, 20009446]
- Ministry of Trade, Industry & Energy (MOTIE, Korea)
- National Research Foundation of Korea (NRF) - Korea government [NRF-2020M2D8A1050303]
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This study reports the electromagnetic interference (EMI) shielding and electrothermal properties of MXene-coated cellulose hybrid papers (MCPs) and fabrics (MCFs) with high flexibility and low density, manufactured by a dip-dry coating approach. The results show that high electrical conductivity and excellent EMI shielding effectiveness are achieved by multiple dip-dry coating cycles on cellulose papers and fabrics. Additionally, even one-time dip-dry coating cycle samples demonstrate outstanding electrothermal performance at low applied voltages.
Herein, the electromagnetic interference (EMI) shielding and electrothermal properties of MXene-coated cellulose hybrid papers (MCPs) and fabrics (MCFs) with high flexibility and low density, which are manufactured by a dip-dry coating approach, are reported. For this purpose, MCPs and MCFs are fabricated by dipping cellulose papers and fabrics repeatedly into an aqueous dispersion of MXene. The electron microscopic and X-ray diffraction data reveal that MXene sheets are coated uniformly on the surfaces of cellulose fibrils and fibers and that their contents increase with the dip-dry coating cycle. For MCP10 (5.68 wt% MXene) and MCF10 (11.77 wt% MXene), which are manufactured by ten-time dip-dry coating cycles, high electrical conductivity of 1.91 and 0.08 S cm(-1) are attained, respectively. In addition, MCP10 and MCF10 possess excellent absolute EMI shielding effectiveness (SSEt) of 2198 and 1100 dB cm(2) g(-1) at 8 GHz, respectively, which is due to the multiple internal reflection and absorption of incident EM waves by conductive and interconnected MXene-coated cellulose fibrils and fibers. It is also found that MCP1 (0.9 wt% MXene) and MCF1 (1.9 wt% MXene) at one-time dip-dry coating cycle show outstanding electrothermal performance in aspects of high saturated temperatures and energy conversion efficiency at low applied voltages.
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