With
the rapidly increasing development of portable device hardware
and flexible electronics, ultrathin electromagnetic interference (EMI)
shielding films with a combination of high flexibility and excellent
mechanical properties are noticeably required. In addition to minimizing
the electromagnetic wave pollution problem, the fire hazards caused
by accidental electrical leakage or aging are also a cause of extensive
concern. Inspired by nacre and sandwich structure, herein, we fabricated
for the first time an electrical insulating sandwich-structured film
based on Ca ion cross-linked sodium alginate (SA)–montmorillonite
(MMT) and Ti3C2T
x
MXene through a step-by-step vacuum-assisted filtration process.
This novel design strategy not only maintains the inner EMI shielding
network but also can act as an excellent fire-resistant barrier to
protect the electronic device in case of accidental fire. Compared
with the pure Ti3C2T
x
layer, such kind of sandwich film can effectively maintain the EMI
shielding performance (50.01 dB), dramatically enhance the mechanical
properties (84.4 MPa), and exhibit excellent fire-resistant performance.
Especially, compared with the film composed of mixture, the EMI shielding
effectiveness value is only 55% that of sandwich films. Besides, it
functions well under long-term heat aging test at 80 °C. Therefore,
this unique design provides a novel EMI material strategy to facilitate
its future applications in flexible electronics.
In this work, a highly efficient flame retardant and electromagnetic interference (EMI) shielding coating on cotton fabric was fabricated by a simple solution impregnation and dipcoating method, which involved three layers of polyacetimidate (PEI), ammonium polyphosphate (APP), and Ti 3 C 2 T x . When exposed directly to flame, the PEI/APP coating lead to a char layer resulting in self-extinguishing performance. Particularly, the cotton fabric coated by increasing amounts of Ti 3 C 2 T x gradually achieved EMI shielding performance. When the Ti 3 C 2 T x sheets content was 5.2 mg/cm 2 , a high electrical conductivity of 670.3 S•m −1 and a EMI shielding effectiveness of 31.04 dB were achieved in the X-band with an absorption-dominated mechanism. Besides, such modified cotton fabric also has the potential to be used as an electrical heating material. The temperature could even reach up to about 64.3 °C under an applied voltage of just 4 V. Therefore, this work provided a feasible idea for preparing multifunctional fabrics.
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.