Recent Progress in Essential Functions of Soft Electronic Skin

Advanced Functional Materials, Journal Year: 2021, Volume and Issue: 31(42)

Published: July 20, 2021

Abstract Inspired by the human skin, electronic skins (e‐skins) composed of various flexible sensors, such as strain sensor, pressure shear force temperature and humility delicate circuits, are emerged to mimic sensing functions skins. In this review, strategies realize versatile functionalities natural skin‐like e‐skins, including strain‐, pressure‐, force‐, temperature‐ humility‐sensing abilities, well self‐healing ability other summarized. Some representative examples high‐performance e‐skins their applications outlined discussed. Finally, outlook future is presented.

Language: Английский

---

Perception‐to‐Cognition Tactile Sensing Based on Artificial‐Intelligence‐Motivated Human Full‐Skin Bionic Electronic Skin

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(31)

Published: June 1, 2022

Traditional electronic skin (e-skin), due to the lack of human-brain-like thinking and judging capability, is powerless accelerate pace intelligent era. Herein, artificial intelligence (AI)-motivated full-skin bionic (FSB) e-skin consisting structures human vellus hair, epidermis-dermis-hypodermis, proposed. Benefiting from double interlocked layered microcone structure supercapacitive iontronic effect, FSB exhibits ultrahigh sensitivity 8053.1 kPa-1 (<1 kPa), linear 3103.5 (1-34 fast response/recovery time <5.6 ms. In addition, it can realize evolution tactile perception advanced cognition after being equipped with a "brain". First, static/dynamic contactless achieved based on triboelectric effect hair bionics. Second, structural bionics epidermis-dermis-hypodermis five-layer multilayer (MLP) enable general gesture robot interaction. Most importantly, by making full use six-layer MLP neural network, an material system developed for real-time object species locations via one contact, which surpasses capability humans.

Language: Английский

---

Highly stable flexible pressure sensors with a quasi-homogeneous composition and interlinked interfaces

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: March 10, 2022

Abstract Electronic skins (e-skins) are devices that can respond to mechanical stimuli and enable robots perceive their surroundings. A great challenge for existing e-skins is they may easily fail under extreme conditions due multilayered architecture with mismatch weak adhesion between the interlayers. Here we report a flexible pressure sensor tough interfaces enabled by two strategies: quasi-homogeneous composition ensures match of interlayers, interlinked microconed interface results in high interfacial toughness 390 J·m −2 . The endows exceptional signal stability determined performing 100,000 cycles rubbing, fixing on car tread driving 2.6 km an asphalt road. topological interlinks be further extended soft robot-sensor integration, enabling seamless robot highly stable sensing performance during manipulation tasks complicated conditions.

Language: Английский

---

Breathable Ti₃C₂T_x MXene/Protein Nanocomposites for Ultrasensitive Medical Pressure Sensor with Degradability in Solvents

ACS Nano, Journal Year: 2021, Volume and Issue: 15(6), P. 9746 - 9758

Published: June 3, 2021

Flexible, breathable, and degradable pressure sensors with excellent sensing performance are drawing tremendous attention for various practical applications in wearable artificial skins, healthcare monitoring, intelligence due to their flexibility, breathability, lightweight, decreased electronic rubbish, environmentally friendly impact. However, traditional plastic or elastomer substrates impermeability, uncomfortableness, mechanical mismatches, nondegradability greatly restricted applications. Therefore, the fabrication of such high facile degradability, breathability is still a critical challenge highly desired. Herein, we present wearable, degradable, sensitive MXene/protein nanocomposites-based sensor. The fabricated MXene/protein-based sensor assembled from breathable conductive MXene coated silk fibroin nanofiber (MXene-SF) membrane patterned ink-printed (MXene ink-SF) interdigitated electrode, which can serve as layer electrode layer, respectively. exhibits wide range (up 39.3 kPa), sensitivity (298.4 kPa-1 1.4-15.7 kPa; 171.9 15.7-39.3 fast response/recovery time (7/16 ms), reliable cycling stability over 10 000 cycles, good biocompatibility, robust degradability. Furthermore, it shows great monitoring human psychological signals, acting an skin quantitative illustration distribution, wireless biomonitoring real time. Considering biodegradable features, may become promising find potential smart motion detection, disease diagnosis, human-machine interaction.

Language: Английский

---

Two‐dimensional MXenes: New frontier of wearable and flexible electronics

InfoMat, Journal Year: 2022, Volume and Issue: 4(4)

Published: Feb. 22, 2022

Abstract Wearable electronics offer incredible benefits in mobile healthcare monitoring, sensing, portable energy harvesting and storage, human‐machine interactions, etc., due to the evolution of rigid structure flexible stretchable devices. Lately, transition metal carbides nitrides (MXenes) are highly regarded as a group thriving two‐dimensional nanomaterials extraordinary building blocks for emerging platforms because their excellent electrical conductivity, enriched surface functionalities, large area. This article reviews most recent developments MXene‐enabled wearable electronics. Several electronic devices designed on nanometric scale highlighted by drawing attention widely developed nonstructural attributes, including 3D configured devices, textile planer substrates, bioinspired structures, printed materials. Furthermore, unique progress these nanodevices is representative applications healthcare, energy, electromagnetic interference (EMI) shielding, humanoid control machines. The prospects MXene key frontier next‐generation envisioned design challenges systems also discussed, followed proposed solutions. image

Language: Английский

---

Ionic Flexible Sensors: Mechanisms, Materials, Structures, and Applications

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(17)

Published: Jan. 15, 2022

Abstract Over the past few decades, flexible sensors have been developed from “electronic” level to “iontronic” level, and gradually “ionic” level. Ionic (IFS) are one kind of advanced that based on concept ion migration. Compared conventional electronic sensors, IFS can not only replicate topological structures human skin, but also capable achieving tactile perception functions similar which provide effective tools methods for narrowing gap between electronics biological interfaces. In this review, latest research developments several typical sensing mechanisms, compositions, structural design, applications comprehensively reviewed. Particularly, development novel ionic materials, designs, biomimetic approaches has resulted in a wide range exciting IFS, effectively sense pressure, strain, humidity with high sensitivity reliability, exhibit self‐powered, self‐healing, biodegradability, other properties skin. Furthermore, artificial human‐interactive technologies, wearable health monitors, related fields Finally, perspectives current challenges future directions presented.

Language: Английский

---

Bio‐Inspired Hybrid Dielectric for Capacitive and Triboelectric Tactile Sensors with High Sensitivity and Ultrawide Linearity Range

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(27)

Published: June 1, 2021

Abstract The trade‐off between sensitivity and linearity is critical for preserving the high pressure‐resolution over a broad range simplifying signal processing/conversion of flexible tactile sensors. Conventional dielectrics suffer from difficulty quantitatively controlling interacted mechanical dielectric properties, thus causing restricted capacitive Herein, inspired by human skin, novel hybrid composed low‐permittivity (low‐ k ) micro‐cilia array, high‐permittivity (high‐ rough surface, micro‐dome array developed. pressure‐induced series‐parallel conversion low‐ high‐ components enables linear effective constant controllable initial/resultant capacitance. gradient compressibility behavior elastic modulus with pressures, which derives capacitance variation determined constant. Therefore, an ultrawide up to 1000 kPa 0.314 –1 are simultaneously achieved optimized dielectric. design also applicable triboelectric sensors, realizes similar output voltage enhanced sensitivity. With across range, potential applications such as healthcare monitoring in diverse scenarios control command via single sensor demonstrated.

Language: Английский

---

Iontronic pressure sensor with high sensitivity over ultra-broad linear range enabled by laser-induced gradient micro-pyramids

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: June 1, 2023

Abstract Despite the extensive developments of flexible capacitive pressure sensors, it is still elusive to simultaneously achieve excellent linearity over a broad range, high sensitivity, and ultrahigh resolution under large preloads. Here, we present programmable fabrication method for microstructures integrate an ultrathin ionic layer. The resulting optimized sensor exhibits sensitivity 33.7 kPa −1 linear range 1700 kPa, detection limit 0.36 Pa, 0.00725% 2000 kPa. Taken together with rapid response/recovery repeatability, applied subtle pulse detection, interactive robotic hand, ultrahigh-resolution smart weight scale/chair. proposed approaches design toolkit from this work can also be leveraged easily tune performance varying target applications open up opportunities create other iontronic sensors.

Language: Английский

---

Functional textiles and composite based wearable thermal devices for Joule heating: progress and perspectives

Applied Materials Today, Journal Year: 2021, Volume and Issue: 23, P. 101025 - 101025

Published: April 7, 2021

Language: Английский

---

Gradient Architecture‐Enabled Capacitive Tactile Sensor with High Sensitivity and Ultrabroad Linearity Range

Small, Journal Year: 2021, Volume and Issue: 17(43)

Published: Sept. 29, 2021

The sensitivity and linearity are critical parameters that can preserve the high pressure-resolution across a wide range simplify signal processing process of flexible tactile sensors. Although extensive micro-structured dielectrics have been explored to improve capacitive sensors, attenuation with increasing pressure is yet be fully resolved. Herein, novel dielectric layer based on gradient micro-dome architecture (GDA) presented simultaneously realize ultrabroad pixels rationally collocated amount height effectively regulate contact area hence enable linear variation in effective constant GDA under varying pressures. With systematical optimization, sensor exhibits 0.065 kPa-1 an up 1700 kPa, which first reported. Based excellent linearity, preserved full scale spectrum. Therefore, potential applications such as all-round physiological detection diverse scenarios, control instruction transmission combinatorial force inputs, convenient Morse code communication non-overlapping capacitance signals successfully demonstrated through single device.

Language: Английский

---