Very recently, MXene‐based wearable hydrogels have emerged as promising candidates for epidermal sensors due to their tissue‐like softness and unique electrical and mechanical properties. However, it remains a challenge to achieve MXene‐based hydrogels with reliable sensing performance and prolonged service life, because MXene inevitably oxidizes in water‐containing system of the hydrogels. Herein, catechol‐functionalized poly(vinyl alcohol) (PVA‐CA)‐based hydrogels is proposed to inhibit the oxidation of MXene, leading to rapid self‐healing and superior strain sensing behaviors. Sufficient interaction of hydrophobic catechol groups with the MXene surface reduces the oxidation‐accessible sites in the MXene for reaction with water and eventually suppresses the oxidation of MXene in the hydrogel. Furthermore, the PVA‐CA‐MXene hydrogel is demonstrated for use as a strain sensor for real‐time motion monitoring, such as detecting subtle human motions and handwriting. The signals of PVA‐CA‐MXene hydrogel sensor can be accurately classified using deep learning models.

Highly Oxidation‐Resistant and Self‐Healable MXene‐Based Hydrogels for Wearable Strain Sensor

Morphology modulated defects engineering from MnO2 supported on carbon foam toward excellent electromagnetic wave absorption

With rapid advances in optoelectronics, electrochromic materials and devices have received tremendous attentions from both industry and academia for their strong potentials in wearable and portable electronics, displays/billboards, adaptive camouflage, tunable optics, and intelligent devices, etc. However, conventional electrochromic materials and devices typically present some serious limitations such as undesirable dull colors, and long switching time, hindering their deeper development. Optical resonators have been proven to be the most powerful platform for providing strong optical confinement and controllable light-matter interactions. They generate locally enhanced electromagnetic near-fields that can convert small refractive index changes in electrochromic materials into high-contrast color variations, enabling multicolor or even panchromatic tuning of electrochromic materials. Here, resonant-cavity-enhanced electrochromic materials and devices, an advanced and emerging trend in electrochromics, are reviewed. In this review, we will focus on the progress in multicolor electrochromic materials and devices based on different types of optical resonators and their advanced and emerging applications, including multichromatic displays, adaptive visible camouflage, visualized energy storage, and applications of multispectral tunability. Among these topics, principles of optical resonators, related materials/devices and multicolor electrochromic properties are comprehensively discussed and summarized. Finally, the challenges and prospects for resonant-cavity-enhanced electrochromic materials and devices are presented. We believe this review will definitely promote the communications among optical physics, electrochemistry, and material science. This article is protected by copyright. All rights reserved.

Resonant-Cavity-Enhanced Electrochromic Materials and Devices.

Abstract Nanocellulose‐based strain sensor (NBSS) have been a subject of growing interest for wearable electronics. However, these electronic devices are susceptible to damage when they come into contact with water and organic contaminants. Recently, researchers have developed a superhydrophobic NBSS. Unfortunately, it does not treat organic pollutants in water when used in an underwater environment. In this paper, a new solution: a superhydrophobic photocatalytic self‐cleaning NBSS created through scrape coating and dip coating methods is proposed. This new method shows outstanding self‐cleaning capabilities against water and organic contaminants due to the synergistic effects of the superhydrophobicity and photocatalysis of MnO 2 nanoparticles. Furthermore, the superhydrophobic photocatalytic self‐cleaning NBSS has an exceptional response time of 0.66 s, a fast recovery time of 0.81 s, a sensitivity ≈66.53 at a strain of 0.5%. It is expect that the superhydrophobic photocatalytic self‐cleaning NBSS can monitor human movements, including finger twists, wrist movements, elbow bends, and knee movements. Not only is the fabrication method cost‐effective and scalable, but the new NBSS holds great promise in a wide range of fields, including human‐machine interactive systems, smart systems, and human‐body monitoring. Overall, the study provides significant guidance for future designs for wearable strain sensors. 

Superhydrophobic Photocatalytic Self‐Cleaning Nanocellulose‐Based Strain Sensor for Full‐Range Human Motion Monitoring

Graphene-based flexible wearable sensors: mechanisms, challenges, and future directions

Highly Durable and Fast Response Fabric Strain Sensor for Movement Monitoring Under Extreme Conditions

Solar radiation is mainly concentrated in the visible and infrared spectra ranges, and its perfect absorption has great significance to solar cell, energy harvester, emitter, perfect stealth, and hot-electron device fields. In this study, we theoretically design and numerically demonstrate a highly efficient broadband visible perfect absorber (VPA) using plasmonic metasurface , which consists of quadrilateral truncated cones configuration. The electromagnetic properties of VPA are discussed by changing the geometrical parameters, especially to the absorption intensity of VPA. VPA processes perfect absorption (100%) at the wavelength of 490 nm and the minimum absorption is 99.51% at the wavelength of 772 nm. The averaged absorption is 99.91% spanned the whole visible spectrum. The excellent absorption performance is revealed by the Fabry-Perot resonance, localized surface plasmon resonance (SPR), and propagating SPR . VPA exhibits ultrahigh absorption, wide incident angle, and polarization-independent characteristics. It proves that the designed VPA has great potential in thermal photovoltaics and energy harvesting applications. • A highly efficient broadband visible perfect absorber (VPA) using plasmonic metasurface is presented. • VPA processes perfect absorption (100%) at the wavelength of 490 nm. • The average absorption is 99.91% spanned the whole visible spectrum. • The averaged absorption intensities are 99.91%, 99.8%, and 94.7% at the incident angles of 0°, 20°, and 60°, respectively. • VPA exhibits ultrahigh absorption, wide incident angle, and polarization-independent characteristics. 

http://manuscript.elsevier.com/S138694772200008X/pdf/S138694772200008X.pdf

Plasmonic metasurface with quadrilateral truncated cones for visible perfect absorber

Hydrogel has been extensively investigated for its unique mechanical and ionic conductive properties. However, the applications of conventional hydrogels have been limited for their poor durability and low external perception....

Bio-inspired Color-Changing and Self-Healing Hybrid Hydrogel for Wearable Sensors and Adaptive Camouflage

Double-shell lignin microcapsules were prepared by one - step method for fabric coatings with UV resistance and durable antibacterial activity

Synchronously modulated the morphology and crystal defects of α-MnO2 for high-performance mono-component electromagnetic wave absorber

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