Superelastic, Ultralight, and Conductive Ti3C2Tx MXene/Acidified Carbon Nanotube Anisotropic Aerogels for Electromagnetic Interference Shielding

材料科学 MXenes公司 碳纳米管 电磁屏蔽 纳米复合材料 导电体 纳米技术 复合材料
作者
Zhiming Deng,Pingping Tang,Xinyu Wu,Haobin Zhang,Zhong‐Zhen Yu
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:13 (17): 20539-20547 被引量:154
标识
DOI:10.1021/acsami.1c02059
摘要

Although hydrophilic and electrically conductive transition-metal carbon/nitride (MXenes) nanosheets hold great promise for electrically conductive and electromagnetic interference (EMI) shielding applications, the weak interaction among MXene nanosheets makes them difficult to form compressible three-dimensional architectures with high conductivity. Herein, inspired by the plant "Parthenocissus tricuspidata", an efficient approach is demonstrated to fabricate conductive and lightweight Ti3C2Tx MXene/acidified carbon nanotube anisotropic aerogels (MCAs) with superelasticity and high thermal insulation. The MXene nanosheets construct the anisotropic and porous skeleton, while the acidified carbon nanotubes reinforce the pore walls of MXene nanosheets, making the MCAs superelastic and compressible. The superelastic MCA with only 5 wt % of the acidified carbon nanotubes is structurally stable during cyclic compressions at both high and ultralow temperatures. Its high conductivity (447.2 S m–1) and ultralow density (9.1 mg cm–3) endow its paraffin composite with a high EMI shielding efficiency of ∼51 dB at an ultralow filler content of 0.3 vol %. When the density of MCA increases to 18.2 mg cm–3, its EMI shielding effectiveness reaches 90 dB. Additionally, the porous and ultralight MCAs exhibit better thermal insulation performances as compared to commercial melamine and polystyrene foams. Therefore, the superelastic, electrically conductive, lightweight, and thermally insulating MCAs would be promising for EMI shielding applications in space equipment and portable wearable devices.
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