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

    Year: 2018

    Journal: Adv. Funct. Mater., Volume 28, OCT 31

    Authors: Weng, Guo-Ming; Li, Jinyang; Alhabeb, Mohamed; Karpovich, Christopher; Wang, Hang; Lipton, Jason; Maleski, Kathleen; Kong, Jaemin; Shaulsky, Evyatar; Elimelech, Menachem; Gogotsi, Yury; Taylor, Andre D.

    Organizations: National Science Foundation; NSF-PECASE award [CBET-0954985]; Fondazione Oronzio e Niccol De Nora Fellowship; Tandon School of Engineering; Science and Technology Planning Project of Sichuan Province [2018GZ0462]; Innovative Talents Training Program in Basic Science, Minister of Education, China

    Keywords: carbon nanotubes; composite films; electromagnetic interference shielding; layer-by-layer assembly; MXene

    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 Ti3C2Tx 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.
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