2 research outputs found
Flexible Transparent PES/Silver Nanowires/PET Sandwich-Structured Film for High-Efficiency Electromagnetic Interference Shielding
We have developed a kind of high-yield synthesis strategy
for silver
nanowires by a two-step injection polyol method. Silver nanowires
and polyethylene oxide (PEO) (<i>M</i><sub>w</sub> = 900 000)
were prepared in a homogeneous-coating ink. Wet composite films with
different thicknesses were fabricated on a PET substrate by drawn-down
rod-coating technology. Silver nanowires on PET substrates present
a homogeneous distribution under the assistance of PEO. Then PEO was
thermally removed in situ at a relatively low temperature attributed
to its special thermal behavior under atmospheric conditions. As-prepared
metallic nanowire films on PET substrates show excellent stability
and a good combination of conductivity and light transmission. A layer
of transparent polyÂ(ethersulfones) (PESs) was further coated on silver
nanowire networks by the same coating method to prevent the shedding
and corrosion of silver nanowires. Sandwich-structured flexible transparent
films were obtained and displayed excellent electromagnetic interference
(EMI) shielding effectiveness
Efficient Flame Detection and Early Warning Sensors on Combustible Materials Using Hierarchical Graphene Oxide/Silicone Coatings
Design
and development of smart sensors for rapid flame detection
in postcombustion and early fire warning in precombustion situations
are critically needed to improve the fire safety of combustible materials
in many applications. Herein, we describe the fabrication of hierarchical
coatings created by assembling a multilayered graphene oxide (GO)/silicone
structure onto different combustible substrate materials. The resulting
coatings exhibit distinct temperature-responsive electrical resistance
change as efficient early warning sensors for detecting abnormal high
environmental temperature, thus enabling fire prevention below the
ignition temperature of combustible materials. After encountering
a flame attack, we demonstrate extremely rapid flame detection response
in 2–3 s and excellent flame self-extinguishing retardancy
for the multilayered GO/silicone structure that can be synergistically
transformed to a multiscale graphene/nanosilica protection layer.
The hierarchical coatings developed are promising for fire prevention
and protection applications in various critical fire risk and related
perilous circumstances