Intrinsically stretchable electronics represent an attractive platform for next-generation implantable devices by reducing the mechanical mismatch and the immune responses with biological tissues. Despite extensive efforts, soft implantable electronic devices often exhibit an obvious trade-off between electronic performances and mechanical deformability because of limitations of commonly used compliant electronic materials. Here, we introduce a scalable approach to create intrinsically stretchable and implantable electronic devices featuring the deployment of liquid metal components for ultrahigh stretchability up to 400% tensile strain and excellent durability against repetitive deformations. The device architecture further shows long-term stability under physiological conditions, conformal attachments to internal organs, and low interfacial impedance. Successful electrophysiological mapping on rapidly beating hearts demonstrates the potential of intrinsically stretchable electronics for widespread applications in health monitoring, disease diagnosis, and medical therapies.
Stretchable electroluminescent device is a compliant form of light-emitting device to expand the application areas of conventional optoelectronics on rigid wafers. Currently, practical implementations are impeded by the high operating voltage required to achieve sufficient brightness. In this study, we report the fabrication of an intrinsically stretchable electroluminescent device based on silver nanowire electrodes and high-k thermoplastic elastomers. The device exhibits a bright emission with a low driving voltage by using polar elastomer as a dielectric matrix of the electroluminescent layer. Highly stretchable silver nanowire electrodes contribute to the exceptional elasticity and durability of the device in spite of bending, stretching, twisting, puncturing, and cutting. Stretchable electroluminescent devices developed here may find potential uses in wearable displays, deformable lightings, and soft robotics.
Stretchable alternating
current electroluminescent display is an
emerging form of light-emitting device by combining elasticity with
optoelectronic properties. The practical implementations are currently
impeded by the high operating voltages required to achieve sufficient
brightness. In this study, we report the development of dielectric
nanocomposites by filling surface-modified ceramic nanoparticles into
polar elastomers, which exhibit a series of desirable attributes,
in terms of high permittivity, mechanical deformability, and solution
processability. Dielectric nanocomposite effectively concentrates
electric fields onto phosphor to enable low-voltage operation of stretchable
electroluminescent display, thereby alleviating safety concerns toward
wearable applications. The practical feasibility is demonstrated by
an epidermal stopwatch that allows intimate integration with the human
body. The high-permittivity nanocomposites reported here represent
an attractive building block for stretchable electronic systems, which
may find broad range of applications in intrinsically stretchable
transistors, sensors, light-emitting devices, and energy-harvesting
devices.
The rapid expansion of electronic technology and short lifespan of consumer devices create a huge amount of electronic waste. The disposal of discarded devices represents a serious environmental challenge. Biodegradable devices are able to decompose into benign components after a period of stable operation during its service life, which represents a potential solution to reduce the environmental footprint of electronic technology. The widespread applications of biodegradable electronics are still hampered by the lack of facile manufacturing approach for high quality devices. Here, a laser sintering technique to weld naturally oxidized Zn microparticles into biodegradable conductors is reported. The sintering process is carried out under ambient conditions and compatible with various biodegradable substrates. A low‐cost fabrication procedure involving stencil printing and laser treatment is established to create conductive features with excellent conductivity and mechanical durability. The practical suitability of printed Zn conductor is demonstrated by fabricating near‐field communication tags, which are flexible and fully functional with the transient behavior modulated by the choice of packaging materials. The printed biodegradable conductor may find potential applications in eco‐friendly sensors, transient printed circuit boards, and implantable medical devices.
Liquid metal confined in the elastomer
represents an ideal platform
for stretchable electronics with ultimate deformability. To enable
facile and scalable patterning of conductive features, bulk liquid
metal is typically dispersed into fine particles to formulate printable
inks. The presence of native oxide or organic ligands stabilizing
these liquid metal particles unfortunately inhibits their direct coalescence
to recover the metallic conductivity and liquid-state deformability.
Here, we report a chemical sintering process that converts printed
liquid metal microparticles into a highly deformable conductor. The
process involves the removal of surface passivating oxide by a short
exposure to acid fume and subsequent selective wetting of liquid metal
microparticles onto copper nanoplates present in the ink formulation.
The chemical reaction provides the basis for a facile and scalable
procedure to print conductive features over a large area with exceptional
conductivity (>104 S cm–1) and ultrahigh
stretchability (∼1000% strain). Their practical suitability
is demonstrated by the fabrication of an ultrastretchable ribbon cable
and an epidermal heater.
A stretchable alternating current electroluminescent display seamlessly combines the light-emitting capabilities with mechanical compliance, which offers exciting opportunities for applications in wearable gadgets, soft robots, and fashion designs. The widespread adaption to deformable forms of optoelectronics is currently impeded by the tedious and labor-intensive fabrication process. This study reports an efficient and scalable procedure to create a fully screen-printed, multicolor, and stretchable electroluminescent display. The as-prepared device exhibits excellent deformability and low-voltage operation. The practical implementation is demonstrated by creating a wearable sound-synchronized sensing system with an epidermal display responsive to the rhythm of music. The ink formulation and printing procedure developed here pave the way for convenient fabrication of stretchable electronic devices.
Electronic textiles offer exciting
opportunities for an emerging
class of electronic technology featuring intimate interaction with
the human body. Among various functional components, a stretchable
conductive textile represents a key building material to support the
development of sensors, interconnects, and electrical contacts. In
this study, a conductive textile is synthesized by bottom-up coassembly
of silver nanowires and TPU microfibers. The conformal coverage of
AgNW network over individual TPU microfibers gives rise to coherent
deformations to mitigate the actual strain for enhanced stretchability
and durability. The as-prepared conductive microtextile exhibits a
series of desirable properties including excellent conductivity (>5000
S cm–1), exceptional stretchability (∼600%
strain), soft mechanical properties, breathability, and washability.
The practical implementation is demonstrated by fabricating an integrated
epidermal sensing sleeve for multichannel EMG signal recordings, which
supports real-time hand gesture recognitions powered by machine learning
algorithm as a smart human–machine interface. The conductive
textile reported in this study is well suited for garment integrated
electronics with potential applications in health monitoring, robotic
prosthetics, and competitive sports.
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