期刊
NANOSCALE
卷 13, 期 4, 页码 2378-2388出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0nr07840a
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资金
- National Key RAMP
- D Program of China [2019YFA0706802]
- National Natural Science Foundation of China [51903223, 12072325]
- China Postdoctoral Science Foundation [2018M642781]
The asymmetric sandwich structure film combines cellulose nanofiber skin-layer with Ti3C2Tx MXene and silver nanowire core-layers, providing a highly conductive network and maintaining structural integrity. The film exhibits high tensile strength, electrical conductivity, EMI shield effectiveness, specific shield effectiveness, and in-plane thermal conductivity, while also demonstrating outstanding solar-thermal energy conversion ability in extremely cold environments.
Flexible cellulose-based conductive films reveal high potential in electromagnetic interference (EMI) shielding and thermal management applications. However, the high contact electrical/thermal resistance in these films is still a challenge to face. In this work, an asymmetric sandwich structural film containing a cellulose nanofiber (CNF) skin-layer and self-supported Ti3C2Tx MXene and silver nanowire (AgNW) core-layers (CNF@MXene@AgNW film) was fabricated through layer-by-layer assembled vacuum-assisted filtration. The unique sandwich structure not only provides a highly conductive network by the highly oriented and self-supported conductive core-layers, but also maintains its structural integrity by ambilateral CNF layers. As a result, the CNF@MXene@AgNW film reveals a strong tensile strength of 118 MPa and a toughness of 4.75 MJ m(-3), super-flexibility (minimum bending radius of similar to 85 mu m), a high electrical conductivity (37 378.2 S m(-1)), effective EMI shield effectiveness (SE, 55.9 dB), outstanding specific SE (SSE/t, 10 647.6 dB cm(2) g(-1)) and high in-plane thermal conductivity (15.53 W m(-1) K-1), simultaneously. More interestingly, the sandwich film also reveals outstanding solar-thermal energy conversion ability, which guarantees its normal function in extremely cold environment. The unique asymmetric sandwich structure provides a new strategy for designing and preparing high-performance EMI shielding and thermal conductive films.
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