Layer‐by‐Layer Assembly of Cross‐Functional Semi‐transparent MXene‐Carbon Nanotubes Composite Films for Next‐Generation Electromagnetic Interference Shielding

Abstract

Lightweight, flexible, and electrically conductive thin films with high electromagnetic interference (EMI) shielding effectiveness are highly desirable for next-generation portable and wearable electronic devices. Here, spin spray layer-by-layer (SSLbL) to rapidly assemble Ti 3 C 2 T x MXene-carbon nanotube (CNT) composite films is shown and their potential for EMI shielding is demonstrated. The SSLbL technique allows strategic combinations of nanostructured materials and polymers providing a rich platform for developing hierarchical architectures with desirable cross-functionalities including controllable transparency, thickness, and conductivity, as well as high stability and flexibility. These semi-transparent LbL MXene-CNT composite films show high conductivities up to 130 S cm −1 and high specific shielding effectiveness up to 58 187 dB cm 2 g −1 , which is attributed to both the excellent electrical conductivity of the conductive fillers (i.e., MXene and CNT) and the enhanced absorption with the LbL architecture of the films. Remarkably, these values are among the highest reported values for flexible and semi-transparent composite thin films. This work could offer new solutions for next-generation EMI shielding challenges.

2D Stacks of MXene Ti3C2 and 1T‐Phase WS2 with Enhanced Capacitive Behavior

“…[8][9][10] A variety of new MXene applications owing to their high electrical conductivity and flexibility has emerged: a deformable supercapacitor paper for flexible electronics, [11] MXene/polymer composites for thermal [12] and MXene/carbon nanotube for electromagnetic shielding. [13] In nanofluidics, they were used as selective gas transport channels [14] and served as a further improvement of electrical conductivity of ceramic materials. [15] Due to their high surface area, various applications such as biosensors [16] and environmental agents for removal of heavy metals from aqueous solutions have been proposed.…”

Kirigami Patterning of MXene/Bacterial Cellulose Composite Paper for All‐Solid‐State Stretchable Micro‐Supercapacitor Arrays

“…Recently, a new type of energy storage material, namely, MXenes, has been developed. [56][57][58][59][60] However, the relatively high price, low yield of these carbon materials, and the need for strict control of their synthetic environment greatly restrict their large-scale commercial application in the future. [51][52][53][54][55] However, few works on MXene-based stretchable MSCAs with both high areal performance metrics and good elongation have been reportedly available so far.…”

Breathable and Wearable MXene-Decorated Air-Laid Paper With Superior Folding Endurance and Electromagnetic Interference-Shielding Performances

“…The second-generation EMI-shielding materials are made by electrical conductive carbon, such as a carbon nanotube (CNT) and graphene (Chen et al, 2013;Song et al, 2017;Wan and Li, 2017;Zhao et al, 2019b). It is, however, still difficult for carbon-based EMI-shielding materials to achieve a high EMI-shielding performance at low thicknesses (Weng et al, 2018).…”