3D shapeable, superior electrically conductive cellulose nanofibers/Ti3C2Tx MXene aerogels/epoxy nanocomposites for promising EMI shielding
作者：[4] Lei Wang, Ping Song, Cheng-Te Lin, Jie Kong and Junwei Gu*
關鍵字：EMI
論文來源：期刊
發表時間：2020年
In this work, 3D highly electrically conductive cellulose nanofibers (CNF)/Ti3C2Tx MXene aerogels (CTA) with aligned porous
structures are fabricated by directional freezing followed by freeze-drying technique, and the thermally annealed CTA
(TCTA)/epoxy nanocomposites are then fabricated by thermal annealing of CTA, subsequent vacuum-assisted impregnation
and curing method. Results show that TCTA/epoxy nanocomposites possess 3D highly conductive networks with ultralow
percolation threshold of 0.20 vol% Ti3C2Tx. When the volume fraction of Ti3C2Tx is 1.38 vol%, the electrical conductivity (σ),
electromagnetic interference shielding effectiveness (EMI SE), and SE divided by thickness (SE/d) values of the TCTA/epoxy
nanocomposites reach 1672 Sm-1, 74 dB, and 37 dBmm-1, respectively, which are almost the highest values compared to those
of polymer nanocomposites reported previously at the same filler content. In addition, compared to those of the samples
without Ti3C2Tx, the storage modulus and heat-resistance index of TCTA/epoxy nanocomposites are enhanced to 9792.5 MPa
and 310.7°C, increased by 62% and 6.9°C, respectively, presenting outstanding mechanical properties and thermal stabilities. The
fabricated lightweight, easy-to-process, and shapeable TCTA/epoxy nanocomposites with superior EMI SE values, excellent
mechanical properties, and thermal stabilities greatly broaden the applications of MXene-based polymer composites in the field
of EMI shielding.