20September2019

Nano-Micro Letters

Ultrathin and Flexible CNTs/MXene/Cellulose Nanofibrils Composite Paper for Highly Efficient Electromagnetic Interference Shielding in X-Band

Wentao Cao1,2, Chang Ma2, Shuo Tan1, Mingguo Ma2, *, Pengbo Wan3, *, Feng Chen1, *

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Nano-Micro Lett. (2019) 11: 72

First Online: 07 September 2019 (Article)

DOI:10.1007/s40820-019-0304-y

*Corresponding author. E-mail: mg_ma@bjfu.edu.cn (Mingguo Ma); pbwan@mail.buct.edu.cn (Pengbo Wan); fchen@tongji.edu.cn (Feng Chen)

 

Abstract

 


Toc

As the rapid development of portable and wearable devices, different electromagnetic interference (EMI) shielding materials with high-efficiency have been desired to eliminate the resulting radiation pollution. However, limited EMI shielding materials are successfully used in practical applications, due to the heavy thickness and absence of sufficient strength or flexibility. Herein, an ultrathin and flexible carbon nanotubes/MXene/cellulose nanofibrils composite paper with gradient and sandwich structure (CMC GS) is constructed for EMI shielding application via a facile alternating vacuum-assisted filtration process. The resultant composite paper exhibits outstanding mechanical properties with a tensile strength of 97.9 ± 5.0 MPa and a fracture strain of 4.6 ± 0.2%. In this composite paper, the sandwich structure possesses favorable advantages in the improvement of EMI shielding effectiveness (SE), whereas the gradient structure has significant effects on regulating the contributions from reflection and absorption. Especially, CMC GS composite paper shows a high electrical conductivity of 2506.6 S m-1 and EMI SE of 38.4 dB, which can be mostly attributed to the successful integration of the gradient and sandwich structures. Thus, the strategy reported in this work is of great significance in the novel structural design for fabricating ultrathin and flexible composite paper with highly efficient EMI shielding performance and in broadening the practical applications of MXene-based composite materials. 


 

Keywords

MXene; Carbon nanotubes; Cellulose nanofibrils; Mechanical property; Electromagnetic interference shielding

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