Magnetized Microcilia Array‐Based Self‐Powered Electronic Skin for Micro‐Scaled 3D Morphology Recognition and High‐capacity Communication

Zhou, Qian; Ji, Bing; Dai, Zhenhong; Ding, Sen; Yang, Hao; Zhong, Junwen; Qiao, Yancong; Zhou, Jianhua; Luo, Jianyi; Zhou, Bingpu

doi:10.1002/adfm.202208120

Cited by 33 publications

(27 citation statements)

References 47 publications

(63 reference statements)

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“…27−29 Recently, along with the rapid development of magnetoactive soft materials, magnetic-based flexible mechanical sensors combining wireless and passive sensing features have been explored, such as wearable mechanomagnetic sensors, 30 flexible magnetic microelectromechanical tactile sensors, 31,32 and wireless pressure sensors. 33 However, the large mass ratio of magnetic materials (e.g., NdFeB and CoFeB) employed in these flexible magnetic sensors as functional materials have resulted in a high modulus and poor biocompatibility. 27,34,35 As sensing materials allowing compliant deformation and less interference with biological activity are the keys to accurate measurements, 15,36 the resulting composites are thus not suitable for implantable device applications.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic-based sensing devices have exhibited extraordinary advantages in integrating wireless and passive capacities in a single system. − As a wireless communication technique, magnetic fields have better penetration depth in biological tissues and fluids compared to traditional electromagnetic waves and optical signals and exhibit strong resistance to ionic interference widely present in biological systems. , The feasibility of magnetic materials to changes in stress, temperature, or chemical reactions without power excitation also enables their passive sensing capability. − Recently, along with the rapid development of magnetoactive soft materials, magnetic-based flexible mechanical sensors combining wireless and passive sensing features have been explored, such as wearable mechanomagnetic sensors, flexible magnetic microelectromechanical tactile sensors, , and wireless pressure sensors . However, the large mass ratio of magnetic materials (e.g., NdFeB and CoFeB) employed in these flexible magnetic sensors as functional materials have resulted in a high modulus and poor biocompatibility. ,, As sensing materials allowing compliant deformation and less interference with biological activity are the keys to accurate measurements, , the resulting composites are thus not suitable for implantable device applications.…”

Section: Introductionmentioning

confidence: 99%

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Ultrasoft and Biocompatible Magnetic-Hydrogel-Based Strain Sensors for Wireless Passive Biomechanical Monitoring

Zhang

Yang

et al. 2022

ACS Nano

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Implantable flexible mechanical sensors have exhibited great potential in health monitoring and disease diagnosis due to continuous and real-time monitoring capability. However, the wires and power supply required in current devices cause inconvenience and potential risks. Magnetic-based devices have demonstrated advantages in wireless and passive sensing, but the mismatched mechanical properties, poor biocompatibility, and insufficient sensitivity have limited their applications in biomechanical monitoring. Here, a wireless and passive flexible magnetic-based strain sensor based on a gelatin methacrylate/Fe3O4 magnetic hydrogel has been fabricated. The sensor exhibits ultrasoft mechanical properties, strong magnetic properties, and long-term stability in saline solution and can monitor strains down to 50 μm. A model of the sensing process is established to identify the optimal detection location and the relation between the relative magnetic permeability and the sensitivity of the sensors. Moreover, an in vitro tissue model is developed to investigate the potential of the sensor in detecting subtle biomechanical signals and avoiding interference with bioactivities. Furthermore, a real-time and high-throughput biomonitoring platform is built and implements passive wireless monitoring of the drug response and cultural status of the cardiomyocytes. This work demonstrates the potential of applying magnetic sensing for biomechanical monitoring and provides ideas for the design of wireless and passive implantable devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrasoft and Biocompatible Magnetic-Hydrogel-Based Strain Sensors for Wireless Passive Biomechanical Monitoring

Zhang

Yang

et al. 2022

ACS Nano

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“…The shape geometry and flexibility of microneedle-like structures can improve the performances of electric generators such as magnetoelectric 84,85 and triboelectric nanogenerators. 86,87 Because of this advantage, microneedles can act as power units of wearable electronics to sensitively perceive weak tactile signals and enable self-powering.…”

Section: Based Power Unitsmentioning

confidence: 99%

“…Based on this principle, Zhou et al integrated magnetized microneedles and underneath flexible coils for producing selfpowered magnetoelectric skins, as shown in Figure 8A. 85 The simulation results in Figure 8B vividly displayed the variation of magnetic flux density during the forceinduced bending process of the microneedles. Thus, when the magnetoelectric skins moved along a convex or concave surface, the microneedles would bend or straighten, producing surface morphology-determined voltage changes and thus realizing 3D topology recognition and tactile sensing (Figure 8C).…”

Section: Magnetoelectric Sensormentioning

confidence: 99%

“…Based on this principle, Zhou et al. integrated magnetized microneedles and underneath flexible coils for producing self‐powered magnetoelectric skins, as shown in Figure 8A 85 . The simulation results in Figure 8B vividly displayed the variation of magnetic flux density during the force‐induced bending process of the microneedles.…”

Section: Mechanism Of Microneedle‐based Power Unitsmentioning

confidence: 99%

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Functional microneedles for wearable electronics

Zhang

Cao

et al. 2023

Smart Medicine

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With an ideal comfort level, sensitivity, reliability, and user‐friendliness, wearable sensors are making great contributions to daily health care, nursing care, early disease discovery, and body monitoring. Some wearable sensors are imparted with hierarchical and uneven microstructures, such as microneedle structures, which not only facilitate the access to multiple bio‐analysts in the human body but also improve the abilities to detect feeble body signals. In this paper, we present the promising applications and latest progress of functional microneedles in wearable sensors. We begin by discussing the roles of microneedles as sensing units, including how the signals are captured, converted, and transmitted. We also introduce the microneedle‐like structures as power units, which depend on triboelectric or piezoelectric effects, etc. Finally, we summarize the cutting‐edge applications of microneedle‐based wearable sensors in biophysical signal monitoring and biochemical analyte detection, and provide critical thinking on their future perspectives.

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Mass‐Producible 3D Hair Structure‐Editable Silk‐Based Electronic Skin for Multiscenario Signal Monitoring and Emergency Alarming System

Gong

et al. 2023

Adv Funct Materials

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Structurally tunable electronic skin (e‐skin) is beneficial for advancing wearable electronics, prosthetics, and human‐machine interaction (HMI). However, the regulation of e‐skin by traditional nanostructure technology is complex and expensive, moreover, the nanostructure's poor deformability leads to small detection range and low sensitivity. Herein, inspired by the structure of skin‐hair and insect burr, a polypyrrole‐silk/glycerol plasticized silk fibroin (P‐silk/RG) e‐skin fabricated by a simple 3D biomimetic structural strategy is reported. Benefitting from the editability (length, position) of this structure, P‐silk/RG has a signal selectivity, long‐cilia P‐silk/RG demonstrates high sensitivity (respond to weak signal‐airflow), while the short‐cilia P‐silk/RG exhibits wide pressure detection range (0.5–200 g) and high cycle stability (8000 compressions). Therefore, different forms of P‐silk/RG are used in different scenarios (long‐cilia for monitoring breathing and coughing for motion detection and disease diagnosis, short‐cilia for pressure‐sensitive Morse code). Besides, P‐silk/RG exhibits good waterproof, editable conductive points and easy device integration, providing the basis for underwater information transmission, multibit coded command output, and early warning for emergency sports accidents and sedentary. Surprisingly, combining this structure with textile weaving can be mass‐produced. Obviously, this 3D biomimetic structure strategy endows e‐skin with editability and improved scene adaptability to provide a favorable way for mass production.

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Magnetized Microcilia Array‐Based Self‐Powered Electronic Skin for Micro‐Scaled 3D Morphology Recognition and High‐capacity Communication

Abstract: Recently, flexible electronic skins (e-skins) have attracted extensive attention for their great potential in health monitoring, human-machine interaction (HMI), intelligent robotics, and Internet of Things, etc. [1][2][3][4][5] E-skins are flexible electronic

Cited by 33 publications

References 47 publications

Ultrasoft and Biocompatible Magnetic-Hydrogel-Based Strain Sensors for Wireless Passive Biomechanical Monitoring

Ultrasoft and Biocompatible Magnetic-Hydrogel-Based Strain Sensors for Wireless Passive Biomechanical Monitoring

Functional microneedles for wearable electronics

Mass‐Producible 3D Hair Structure‐Editable Silk‐Based Electronic Skin for Multiscenario Signal Monitoring and Emergency Alarming System

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