Constructing
multifunctional electromagnetic interference (EMI)
shielding films with superior mechanical strength has sparked a lot
of interest in the fields of wearable electronics. In this work, the
conductive silver nanowires (AgNWs) were synthesized and impregnated
into the highly aligned cellulose scaffold (CS) fabricated by wood
delignification followed by hot-pressing and polydimethylsiloxane
(PDMS) dipping processes to obtain the outstanding EMI shielding cellulosic
film (d-AgNWs@CS-PDMS). The consecutively conductive pathway of AgNWs
was constructed in the microchannels of the CS as a result of the
hydrogen bonding between AgNWs and cellulose fibers, which is conducive
to the reflection of incident EM waves. The higher degree of nanofiber
alignment and the compact conductive network were improved by densification
upon hot pressing, which endows the composite film with striking mechanical
properties (maximum tensile strength of 511.8 MPa) and superb EMI
shielding performance (shielding effectiveness value of 46 dB with
a filler content of 21.6 wt %) at the X band (8.2–12.4 GHz).
Moreover, the existence of an intensive AgNWs network and the introduction
of the PDMS layer improve the hydrophobicity and antibacterial activity
of the composite film, avoiding serious health concerns in the long-term
wearing. These results demonstrate that the obtained d-AgNWs@CS-PDMS
composite film has high potential as an EMI shielding material used
for wearable devices.
An optical transparent and hazy film with admirable flexibility,
electromagnetic interference (EMI) shielding, and Joule heating performance
meeting the requirements of optoelectronic devices is significantly
desirable. Herein, a cellulose paper was infiltrated by epoxy resin
to fabricate a transparent cellulose paper (TCP) with high transparency,
optical haze, and favorable flexibility, owing to effective light
scattering and mechanical enhancement of the cellulose network. Moreover,
a highly connected silver nanowire (AgNW) network was constructed
on the TCP substrate by the spray-coating method and appropriate thermal
annealing technique to realize high electrical conductivity and favorable
optical transmittance of the composite film at the same time, followed
by coating of a polydimethylsiloxane (PDMS) layer for protection of
the AgNW network. The obtained PDMS/AgNWs/TCP composite film features
considerable optical transmittance (up to 86.8%) and haze (up to 97.7%),
while satisfactory EMI shielding effectiveness (SE) (up to 39.1 dB,
8.2–12.4 GHz) as well as strong mechanical strength (higher
than 41 MPa) were achieved. The coated PDMS layer prevented the AgNW
network from falling off and ensured the long-term stability of the
PDMS/AgNWs/TCP composite film under deformations. In addition, the
multifunctional PDMS/AgNWs/TCP composite film also exhibited excellent
Joule heating performance with low supplied voltages, rapid response,
and sufficient stability. This work demonstrates a novel pathway to
improve the performance of multifunctional transparent composite films
for future advanced optoelectronic devices.
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