Fuente: Polymers Polymers, Vol. 18, Pages 999: Exceptional Specific Shielding Effectiveness of TOCNFs@MXene Hybrid Films via Densification Engineering
Polymers doi: 10.3390/polym18080999
Authors:
Beibei Wang
Licheng Zhou
Sentao Wei
Jian Wang
Qun Wu
Chuan Cao
Kushairi Mohd Salleh

The rapid advancement of communication technologies exacerbates severe electromagnetic interference (EMI) pollution. Conventional flexible shielding materials rely heavily on non-degradable petroleum-based polymers, aggravating the electronic waste crisis. To address this dual challenge, sustainable biomass-derived TEMPO-oxidized cellulose nanofibrils (TOCNFs) emerge as ideal structural substrates. However, their intrinsic electrical insulation necessitates integrating conductive two-dimensional (2D) MXene, which suffers from severe self-restacking and brittleness. Herein, TOCNFs@MXene hybrid films are manufactured via vacuum filtration and hot-pressing densification. TOCNFs inhibit MXene self-restacking, constructing a highly ordered layered architecture via a dense hydrogen-bonded network. The optimized ultrathin film T5@M20 (~4.92 μm) exhibits an electrical conductivity of 1.09 × 106 ± 5.06 × 104 s m−1 and an X-band shielding effectiveness (SETotal) of 25.55 dB. Demonstrating an ultrahigh thickness-normalized specific shielding effectiveness (SSE/t) of 51,934.72 dB·cm2·g−1, this sustainable architecture shows exceptional potential for next-generation flexible electronics.