Biomimetic Porous MXene Sediment-Based Hydrogel for High-Performance and Multifunctional Electromagnetic Interference Shielding

ACS Nano, Journal Year: 2022, Volume and Issue: 16(9), P. 15042 - 15052

Published: Aug. 19, 2022

Developing high-performance and functional hydrogels that mimic biological materials in nature is promising yet remains highly challenging. Through a facile, scalable unidirectional freezing followed by salting-out approach, type of composed "trashed" MXene sediment (MS) biomimetic pores manufactured. By integrating the honeycomb-like ordered porous structure, conductive MS, water, electromagnetic interference (EMI) shielding effectiveness up to 90 dB X band can reach more than 40 ultrabroadband gigahertz (8.2–40 GHz) for flexible hydrogel, outperforming previously reported EMI shields. Moreover, thanks stable framework MS-based influences water on performance are quantitatively identified. Furthermore, extremely low content silver nanowire embedded into hydrogels, leading significantly improved multiple reflection-induced microwave loss thus performance. Last, allow sensitive reliable detection human motions smart coding. This work not only achieves control via interior structure but also demonstrates waste-free, low-cost, strategy prepare multifunctional, hydrogels.

Language: Английский

---

Peptide-enhanced tough, resilient and adhesive eutectogels for highly reliable strain/pressure sensing under extreme conditions

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

Published: Nov. 5, 2022

Abstract Natural gels and biomimetic hydrogel materials have been able to achieve outstanding integrated mechanical properties due the gain of natural biological structures. However, nearly every structure relies on water as solvents or carriers, which limits possibility in extreme conditions, such sub-zero temperatures long-term application. Here, peptide-enhanced eutectic were synthesized by introducing α-helical “molecular spring” into deep solvent. The gel takes full advantage structure, achieving high tensile/compression, good resilience, superior fracture toughness, excellent fatigue resistance strong adhesion, while it also inherits benefits solvent solves problems volatilization freezing. This enables unprecedentedly long stable sensing human motion movement. electrical signal shows almost no drift even after 10,000 deformations for 29 hours −20 °C 80 temperature range.

Language: Английский

---

Deep‐Learning‐Assisted Noncontact Gesture‐Recognition System for Touchless Human‐Machine Interfaces

Advanced Functional Materials, Journal Year: 2022, Volume and Issue: 32(49)

Published: Sept. 30, 2022

Abstract Human‐machine interfaces (HMIs) play important role in the communication between humans and robots. Touchless HMIs with high hand dexterity hygiene hold great promise medical applications, especially during pandemic of coronavirus disease 2019 (COVID‐19) to reduce spread virus. However, current touchless are mainly restricted by limited types gesture recognition, requirement wearing accessories, complex sensing platforms, light conditions, low recognition accuracy, obstructing their practical applications. Here, an intelligent noncontact gesture‐recognition system is presented through integration a triboelectric sensor (TTS) deep learning technology. Combined deep‐learning‐based multilayer perceptron neural network, TTS can recognize 16 different gestures average accuracy 96.5%. The further applied control robot for collecting throat swabs mode. Compared present HMIs, proposed diverse utilizing charges naturally carried on human fingers without need complicated device structures, adequate achieves accuracy. This could provide exciting opportunities develop new generation equipment, as well public facilities, smart robots, virtual reality, metaverse, etc.

Language: Английский

---

Deep-Learning Enabled Active Biomimetic Multifunctional Hydrogel Electronic Skin

ACS Nano, Journal Year: 2023, Volume and Issue: 17(16), P. 16160 - 16173

Published: July 31, 2023

There is huge demand for recreating human skin with the functions of epidermis and dermis interactions physical world. Herein, a biomimetic, ultrasensitive, multifunctional hydrogel-based electronic (BHES) was proposed. Its function mimicked using poly(ethylene terephthalate) nanoscale wrinkles, enabling accurate identification materials through capabilities to gain/lose electrons during contact electrification. Internal mechanoreceptor by interdigital silver electrodes stick–slip sensing identify textures/roughness. The patterned microcone hydrogel, achieving pressure sensors high sensitivity (17.32 mV/Pa), large range (20–5000 Pa), low detection limit, fast response (10 ms)/recovery time (17 ms). Assisted deep learning, this BHES achieved accuracy minimized interference in identifying (95.00% 10 materials) textures (97.20% four roughness cases). By integrating signal acquisition/processing circuits, wearable drone control system demonstrated three-degree-of-freedom movement enormous potentials soft robots, self-powered human–machine interaction interfaces digital twins.

Language: Английский

---

In Situ Polymerized MXene/Polypyrrole/Hydroxyethyl Cellulose-Based Flexible Strain Sensor Enabled by Machine Learning for Handwriting Recognition

ACS Applied Materials & Interfaces, Journal Year: 2023, Volume and Issue: 15(4), P. 5811 - 5821

Published: Jan. 17, 2023

Flexible strain sensors have significant progress in the fields of human–computer interaction, medical monitoring, and handwriting recognition, but they also face many challenges such as capture weak signals, comprehensive acquisition information, accurate recognition. can sense externally applied deformations, accurately measure human motion physiological record signal characteristics handwritten text. Herein, we prepare a sandwich-structured flexible sensor based on an MXene/polypyrrole/hydroxyethyl cellulose (MXene/PPy/HEC) conductive material PDMS substrate. The features wide linear detection range (0–94%), high sensitivity (gauge factor 357.5), reliable repeatability (>1300 cycles), ultrafast response–recovery time (300 ms), other excellent sensing properties. MXene/PPy/HEC detect activities, exhibiting performance measuring external changes real-time detection. In addition, signals English words, Arabic numerals, Chinese characters by volunteers measured unique characteristics. Through machine learning technology, different are successfully identified, recognition accuracy is higher than 96%. results show that has impact detection, health

Language: Английский

---

Bioinspired Self‐healing Soft Electronics

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(17)

Published: Feb. 7, 2023

Abstract Inspired by nature, various self‐healing materials that can recover their physical properties after external damage have been developed. Recently, widely used in electronic devices for improving durability and protecting the from failure during operation. Moreover, integrate many other intriguing of biological systems, such as stretchability, mechanical toughness, adhesion, structural coloration, providing additional fascinating experiences. All these inspirations attracted extensive research on bioinspired soft electronics. This review presents a detailed discussion Firstly, two main healing mechanisms are introduced. Then, four categories electronics, including insulators, semiconductors, conductors, ionic reviewed, functions, working principles, applications summarized. Finally, human‐inspired animal‐inspired well applications, organic field‐effect transistors (OFETs), pressure sensors, strain chemical triboelectric nanogenerators (TENGs), actuators, cutting‐edge promising field is believed to stimulate more excellent cross‐discipline works material science, flexible novel accelerating development human motion monitoring, environmental sensing, information transmission, etc.

Language: Английский

---

Trehalose-enhanced ionic conductive hydrogels with extreme stretchability, self-adhesive and anti-freezing abilities for both flexible strain sensor and all-solid-state supercapacitor

Chemical Engineering Journal, Journal Year: 2023, Volume and Issue: 472, P. 144849 - 144849

Published: July 17, 2023

Language: Английский

---

Self‐Healing Hydrogel Bioelectronics

Advanced Materials, Journal Year: 2023, Volume and Issue: 36(21)

Published: Nov. 22, 2023

Abstract Hydrogels have emerged as powerful building blocks to develop various soft bioelectronics because of their tissue‐like mechanical properties, superior bio‐compatibility, the ability conduct both electrons and ions, multiple stimuli‐responsiveness. However, hydrogels are vulnerable damage, which limits usage in developing durable hydrogel‐based bioelectronics. Self‐healing aim endow with property repairing specific functions after failure, thus improving durability, reliability, longevity. This review discusses recent advances self‐healing hydrogels, from mechanisms, material chemistry, strategies for properties improvement hydrogel materials, design, fabrication, applications bioelectronics, including wearable physical biochemical sensors, supercapacitors, flexible display devices, triboelectric nanogenerators (TENGs), implantable etc. Furthermore, persisting challenges hampering development prospects proposed. is expected expedite research

Language: Английский

---

Soft Fiber Electronics Based on Semiconducting Polymer

Chemical Reviews, Journal Year: 2023, Volume and Issue: 123(8), P. 4693 - 4763

Published: Feb. 8, 2023

Fibers, originating from nature and mastered by human, have woven their way throughout the entire history of human civilization. Recent developments in semiconducting polymer materials further endowed fibers textiles with various electronic functions, which are attractive applications such as information interfacing, personalized medicine, clean energy. Owing to ability be easily integrated into daily life, soft fiber electronics based on polymers gained popularity recently for wearable implantable applications. Herein, we present a review previous current progress polymer-based electronics, particularly focusing smart-wearable areas. First, provide brief overview viewpoint basic concepts functionality requirements different devices. Then analyze existing associated devices interfaces, healthcare energy conversion storage. The working principle performance summarized. Furthermore, focus fabrication techniques Based continuous one-dimensional yarn, introduce two- three-dimensional fabric fabricating methods. Finally, challenges relevant perspectives potential solutions address related problems.

Language: Английский

---

Self-Healing Hydrogels: From Synthesis to Multiple Applications

ACS Materials Letters, Journal Year: 2023, Volume and Issue: 5(7), P. 1787 - 1830

Published: May 26, 2023

Due to the good reliability and long-term stability, self-healing hydrogels have emerged as promising soft materials for tissue engineering, smart wearable sensors, bioelectronics, energy storage devices. The mechanism depends on reversible chemical or physical cross-linking interactions. Self-healing with fascinating features (including mechanical performances, biocompatibility, conductivity, antibacterial ability, responsiveness, etc.) are being designed developed according practical application requirements. In this review, recent progress in their synthesis strategies multiple applications is summarized. Their involve processes a combination of two. include flexible strain supercapacitors, actuators, adhesives, wound healing, drug delivery, tumor treatment, 3D printing, etc. Finally, current challenges, future development, opportunities discussed.

Language: Английский

---