The development of flexible composites
based on the transition
metal carbides/nitrides (MXenes) is gaining popularity because of
MXenes’ high application potentials for electromagnetic interference
(EMI) shields. Here, we prepare a new type of ultraflexible composite
films composed of “trashed” MXene sediment (MS) and
waterborne polyurethane using a simple, facile solution casting approach.
In addition to the outstanding mechanical strength and electrical
conductivity, an extremely wide-range of MS contents can be achieved
for the composites, resulting in EMI shielding effectiveness (SE)
that may be controlled over a wide range. The X-band EMI SE of the
flexible, low-density composites containing 70 wt % MS reaches 45.3
dB at a thickness of merely 0.51 mm. Moreover, the SE values of more
than 34.5 dB in the ultrabroadband gigahertz frequency range including
X-band, P-band, K-band, and R-band, are accomplished for the thin
composites. Furthermore, the MS/WPU composite films show excellent
electrothermal and photothermal performance, demonstrating the multifunctionalities
of the MS-based EMI shields. Combined with the cost-efficient, sustainable,
and scalable preparation approach, the ultraflexible, multifunctional
composites from “trashed MXene” show great potentials
for next-generation electronics. This work also opens a new avenue
for the creation of innovative, high-performance, multifunctional
flexible composites.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.