3 research outputs found
Facile Preparation of a Self-Adhesive Conductive Hydrogel with Long-Term Usability
Although conductive hydrogels (CHs) have been investigated
as the
wearable sensor in recent years, how to prepare the multifunctional
CHs with long-term usability is still a big challenge. In this paper,
we successfully prepared a kind of conductive and self-adhesive hydrogel
with a simple method, and its excellent ductility makes it possible
as a flexible strain sensor for intelligent monitoring. The CHs are
constructed by polyÂ(vinyl alcohol) (PVA), polydopamine (PDA), and
phytic acid (PA) through the freeze–thaw cycle method. The
introduction of PA enhanced the intermolecular force with PVA and
provided much H+ for augmented conductivity, while the
catechol group on PDA endows the hydrogel with self-adhesion ability.
The PVA/PA/PDA hydrogel can directly contact with the skin and adhere
to it stably, which makes the hydrogel potentially a wearable strain
sensor. The PVA/PA/PDA hydrogel can monitor human motion signals (including
fingers, elbows, knees, etc.) in real-time and can accurately monitor
tiny electrical signals for smile and handwriting recognition. Notably,
the composite CHs can be used in a normal environment even after 4
months. Because of its excellent ductility, self-adhesiveness, and
conductivity, the PVA/PA/PDA hydrogel provides a new idea for wearable
bioelectronic sensors
Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications
The thin physical
profile of perovskite-based solar cells (PSCs)
fabricated on flexible substrates provides the prospect of a disruptive
increase in specific power (power-to-mass ratio), an important figure-of-merit
for solar cells to be used in space applications. In contrast to recent
reports on space applications of PSCs which focus on rigid glass-based
devices, in this work we investigate the suitability of flexible PSCs
for low-earth orbit (LEO) applications, where the perovskite layer
in the PSCs was prepared using either a Ruddlesden–Popper precursor
composition (BA2MA3Pb4I13; BA = butylammonium, MA = methylammonium) or a mixed-cation precursor
composition (Cs0.05FA0.81MA0.14Pb2.55Br0.45; FA = formamidinium). The flexible PSC
devices display a tolerance to high-energy proton (14 MeV) and electron
(>1 MeV) radiation comparable with, or superior to, equivalent
glass-based
PSC devices. The photovoltaic performance of the PSCs is found to
be significantly less dependent on angle-of-incidence than GaAs-based
triple-junction solar cells commonly used for space applications.
Results from a preliminary test of the robustness of the perovskite
film when subjected to LEO-like thermal environments are also reported.
In addition, a unique deployment concept integrating printed flexible
solar cells with titanium–nickel based shape memory alloy ribbons
is presented for thermally actuated deployment of flexible solar cells
from a rolled state
Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications
The thin physical
profile of perovskite-based solar cells (PSCs)
fabricated on flexible substrates provides the prospect of a disruptive
increase in specific power (power-to-mass ratio), an important figure-of-merit
for solar cells to be used in space applications. In contrast to recent
reports on space applications of PSCs which focus on rigid glass-based
devices, in this work we investigate the suitability of flexible PSCs
for low-earth orbit (LEO) applications, where the perovskite layer
in the PSCs was prepared using either a Ruddlesden–Popper precursor
composition (BA2MA3Pb4I13; BA = butylammonium, MA = methylammonium) or a mixed-cation precursor
composition (Cs0.05FA0.81MA0.14Pb2.55Br0.45; FA = formamidinium). The flexible PSC
devices display a tolerance to high-energy proton (14 MeV) and electron
(>1 MeV) radiation comparable with, or superior to, equivalent
glass-based
PSC devices. The photovoltaic performance of the PSCs is found to
be significantly less dependent on angle-of-incidence than GaAs-based
triple-junction solar cells commonly used for space applications.
Results from a preliminary test of the robustness of the perovskite
film when subjected to LEO-like thermal environments are also reported.
In addition, a unique deployment concept integrating printed flexible
solar cells with titanium–nickel based shape memory alloy ribbons
is presented for thermally actuated deployment of flexible solar cells
from a rolled state