MXenes for Wearable Physical Sensors toward Smart Healthcare

ACS Nano, Год журнала: 2024, Номер 18(36), С. 24705 - 24740

Опубликована: Авг. 26, 2024

The gradual rise of personal healthcare awareness is accelerating the deployment wearable sensors, whose ability acquiring physiological vital signs depends on sensing materials. MXenes have distinct chemical and physical superiorities over other 2D nanomaterials for sensors. This review presents a comprehensive summary latest advancements in MXenes-based materials It begins with an introduction to special structural features performance, followed by in-depth exploration versatile functionalities. A detailed description different mechanisms also included illustrate contribution performance its improvement. In addition, real-world applications sensors monitoring are as well. remaining challenges their promising opportunities finally narrated, conjunction prospective future development.

Язык: Английский

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Flexible Pressure Sensors Based on Molybdenum Disulfide/Hydroxyethyl Cellulose/Polyurethane Sponge for Motion Detection and Speech Recognition Using Machine Learning

ACS Applied Materials & Interfaces, Год журнала: 2022, Номер 15(1), С. 2043 - 2053

Опубликована: Дек. 26, 2022

Flexible pressure sensors with excellent performance have broad application potential in wearable devices, motion monitoring, and human-computer interaction. In this paper, a flexible sensor porous structure is proposed by coating molybdenum disulfide (MoS2) hydroxyethyl cellulose (HEC) on polyurethane (PU) sponge skeleton. The obtained has sensitivity (0.746 kPa-1), wide detection range (250 kPa), fast response (120 ms), outstanding repeatability over 2000 cycles. It proven that the can realize human distinguish touch of varying strength. addition, sensing array was fabricated to reflect distribution recognize writing Arabic numerals. Finally, performs speech through throat muscle movements, high-accuracy (97.14%) recognition for seven words achieved machine learning algorithm based support vector (SVM). This work provides an opportunity fabricate simple applications next-generation electronic skin, health detection, intelligent robotics.

Язык: Английский

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Multifunctional MXene Conductive Zwitterionic Hydrogel for Flexible Wearable Sensors and Arrays

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(20), С. 24933 - 24947

Опубликована: Май 11, 2023

Conductive hydrogels have good prospects in the fields of flexible electronic devices and artificial intelligence due to their biocompatibility, durability, functional diversity. However, process hydrogel polymerization is time-consuming energy-consuming, freezing at zero temperature inevitable, which seriously hinders its applications working life. Herein, zwitterionic conductive with self-adhesive antifreeze properties were prepared one minute by introducing two-dimensional (2D) MXene nanosheets into autocatalytically enhanced system composed tannic acid-modified cellulose nanofibers zinc chloride. The has strong environmental applicability (-60 40 °C), stretchability (ductility ≈ 980%), durable adhesion (even after 30 days exposure air), electrical conductivity (20 °C, mS cm-1). By virtue these advantages, can be developed strain sensors monitor large human movements subtle physiological signals over a wide range capture from handwriting voice recognition. In addition, multiple assembled three-dimensional (3D) array, detect magnitude spatial distribution or force. These results demonstrate that promising medical monitoring intelligence.

Язык: Английский

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Microcracked strain sensor based on carbon nanotubes/copper composite film with high performance and waterproof property for underwater motion detection

Composites Part B Engineering, Год журнала: 2023, Номер 254, С. 110574 - 110574

Опубликована: Янв. 31, 2023

Язык: Английский

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Highly flexible triboelectric nanogenerators with electrospun PVDF-TrFE nanofibers on MWCNTs/PDMS/AgNWs composite electrodes

Composites Part B Engineering, Год журнала: 2023, Номер 255, С. 110622 - 110622

Опубликована: Фев. 14, 2023

Язык: Английский

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MXene‐Based Flexible Sensors: Materials, Preparation, and Applications

Advanced Materials Technologies, Год журнала: 2023, Номер 8(12)

Опубликована: Апрель 10, 2023

Abstract The rational design and applications of MXene‐based materials have yielded remarkable progress in flexible sensors, including wearable devices, soft robots, smart medical equipment. emerging MXene substrate can be precisely engineered to improve the mechanical properties sensing sensitivity opening up a wider range application possibilities for sensors. Therefore, systematic comprehensive review summarizing sensor research based on these backgrounds is necessary. First, we discuss basic structure introduce sensors detail. Then, also different preparation methods describe classifications, highlight various scenarios. Finally, identify challenges that need overcome accelerate development sensing. This provides insight into it expected this will contribute higher performance

Язык: Английский

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Waterproof Flexible Pressure Sensors Based on Electrostatic Self-Assembled MXene/NH₂-CNTs for Motion Monitoring and Electronic Skin

ACS Applied Materials & Interfaces, Год журнала: 2023, Номер 15(27), С. 32569 - 32579

Опубликована: Июнь 29, 2023

Flexible wearable sensors to monitor human movement and for electronic skins must exhibit high sensitivity, a wide detection range, waterproof characteristics. This work reports flexible, highly sensitive, sponge pressure sensor (SMCM). The is made by assembling SiO2 (S), MXene (M), NH2-CNTs (C) on the backbone of melamine (M). SMCM exhibits excellent sensitivity (10.8 kPa-1), an ultra-short response/recovery time (40 ms/60 ms), range (30 kPa), extremely low limit (4.6 Pa). Benefiting from layer-by-layer self-assembly, still stability after 5000 cycles. In addition, also has performance (a water contact angle 142°), enabling it operate unaffectedly under wet conditions. can accurately detect small body movements such as pulse swallowing while detecting finger elbow movements. be designed array construct skin magnitude distribution external pressure. holds great application potential in next-generation skin, fitness detection, flexible sensors.

Язык: Английский

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Highly Sensitive Fiber Pressure Sensors over a Wide Pressure Range Enabled by Resistive-Capacitive Hybrid Response

ACS Nano, Год журнала: 2023, Номер 17(15), С. 14904 - 14915

Опубликована: Июль 27, 2023

Soft capacitive pressure sensors with high performance are becoming increasingly in demand the emerging flexible wearable field. While fiber have achieved sensitivity, their sensitivity range is limited to low-pressure levels. As typically require preloading and fixation, this narrow of poses a challenge for practical applications. To overcome limitation, study proposes resistive-capacitive hybrid response (HFPSs) three-layer core–sheath structures. The trigger enhancement mechanisms determined through model analysis experimental verification. By adjustment response, attenuation HFPSs alleviated significantly. obtained results demonstrate that excellent characteristics such as fast low hysteresis, wide frequency, small signal drift, good durability. enhances various With enhanced can effectively monitor pulse signals at preloads ranging from 0 22.7 kPa. This improves fault tolerance monitoring expands potential application scenarios sensors.

Язык: Английский

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Wearable flexible pressure sensors: An intriguing design towards microstructural functionalization

Journal of Materials Chemistry A, Год журнала: 2023, Номер 12(12), С. 6826 - 6874

Опубликована: Дек. 19, 2023

Microstructures can endow flexible pressure sensors with high sensitivity and a wide linear sensing range, ensuring the comprehensive performance of medical monitoring intelligent robots.

Язык: Английский

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Flexible Piezoelectric Nanogenerator Based on Cellulose Nanofibril/MXene Composite Aerogels for Low-Frequency Energy Harvesting

ACS Applied Nano Materials, Год журнала: 2023, Номер 6(10), С. 9021 - 9031

Опубликована: Май 11, 2023

Cellulose is emerging as a green and sustainable material in piezoelectric nanogenerators (PENGs) for ambient energy harvesting, although its relatively low coefficient still remains challenge, hindering the potential applications. In this report, flexible PENG with considerable conversion capacity was fabricated by using polydimethylsilane (PDMS)-encapsulated cellulose nanofibril (CNF)/Ti3C2Tx (MXene) composite aerogel film, which capable of collecting low-frequency such from human activities. The use two-dimensional MXene nanosheets not only optimizes structural regularity CNF network but also induces local polarization locking to align cellulosic dipoles. This strategy essentially improved property cellulose, avoiding conventional consuming method (i.e., electrical poling) strengthen piezoelectricity. Moreover, thin layer PDMS endows good mechanical stability flexibility; meanwhile, it prevents oxidizing so maintain activity. optimized CNF/MXene-PENG containing 10 wt % generates dramatically voltage 30.8 V current 0.49 μA. work provides an easy effective pathway access materials enhanced piezoelectricity, aiming approach flexible, green, low-cost PENGs new-generation electronics.

Язык: Английский

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