Cellulose nanofibrils
(CNFs) and single-walled carbon nanotubes
(SWNTs) hold potential for fabricating multifunctional composites
with remarkable performance. However, it is technically tough to fabricate
materials by CNFs and SWNTs with their intact properties, mainly because
of the weakly synergistic interaction. Hence, constructing sturdy
interfaces and sequential connectivity not only can enhance mechanical
strength but also are capable of improving the electrical conductivity.
In that way, we report CNF/SWNT filaments composed of axially oriented
building blocks with robust CNF networks wrapping to SWNTs. The composite
filaments obtained through the combination of three-mill-roll and
wet-spinning strategy display high strength up to ∼472.17 MPa
and a strain of ∼11.77%, exceeding most results of CNF/SWNT
composites investigated in the previous literature. Meanwhile, the
filaments possess an electrical conductivity of ∼86.43 S/cm,
which is also positively dependent on temperature changes. The multifunctional
filaments are further manufactured as a strain sensor to measure mass
variation and survey muscular movements, leading to becoming optimistic
incentives in the fields of portable gauge measuring and wearable
bioelectronic therapeutics.
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