The
fabrication of ultrathin films that are electrically conductive
and mechanically strong for electromagnetic interference (EMI) shielding
applications is challenging. Herein, ultrathin, strong, and highly
flexible Ti3C2T
x
MXene/bacterial cellulose (BC) composite films are fabricated by
a scalable in situ biosynthesis method. The Ti3C2T
x
MXene nanosheets
are uniformly dispersed in the three-dimensional BC network to form
a mechanically entangled structure that endows the MXene/BC composite
films with excellent mechanical properties (tensile strength of 297.5
MPa at 25.7 wt % Ti3C2T
x
) and flexibility. Importantly, a 4 μm thick Ti3C2T
x
/BC composite film with
76.9 wt % Ti3C2T
x
content demonstrates a specific EMI shielding efficiency of 29141
dB cm2 g–1, which surpasses those of
most previously reported MXene-based polymer composites with similar
MXene contents and carbon-based polymer composites. Our findings show
that the facile, environmentally friendly, and scalable fabrication
method is a promising strategy for producing ultrathin, strong, and
highly flexible EMI shielding materials such as the freestanding Ti3C2T
x
/BC composite films
for efficient EMI shielding to address EMI problems of a fast-developing
modern society.
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