Recent Advances in Flexible Tactile Sensors for Intelligent Systems

Peng, Yiyao; Yang, Ning; Xu, Qianfan; Dai, Yang; Wang, Zhiqiang

doi:10.3390/s21165392

Cited by 61 publications

(40 citation statements)

References 125 publications

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“…Recently, owing to the wide range of diagnosis applications for precise healthcare monitoring, the design and development of sensor materials have become center stage for the development of biosensors where advanced materials play a key role [111][112][113][114]. The advancement of technology has also driven smart and wearable devices for biomedical applications, and smart sensors on flexible electronics made great progress in medical applications [115][116][117]. Smart biosensors can respond to and record external stimuli such as electrical, chemical, optical, mechanical, and thermal, thereby enabling fitness tracking, real-time health monitoring, and disease forecasting [118,119].…”

Section: Biosensor and Smart Sensor Applicationsmentioning

confidence: 99%

Advances of MXenes; Perspectives on Biomedical Research

2022

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The last decade witnessed the emergence of a new family of 2D transition metal carbides and nitrides named MXenes, which quickly gained momentum due to their exceptional electrical, mechanical, optical, and tunable functionalities. These outstanding properties also rendered them attractive materials for biomedical and biosensing applications, including drug delivery systems, antimicrobial applications, tissue engineering, sensor probes, auxiliary agents for photothermal therapy and hyperthermia applications, etc. The hydrophilic nature of MXenes with rich surface functional groups is advantageous for biomedical applications over hydrophobic nanoparticles that may require complicated surface modifications. As an emerging 2D material with numerous phases and endless possible combinations with other 2D materials, 1D materials, nanoparticles, macromolecules, polymers, etc., MXenes opened a vast terra incognita for diverse biomedical applications. Recently, MXene research picked up the pace and resulted in a flood of literature reports with significant advancements in the biomedical field. In this context, this review will discuss the recent advancements, design principles, and working mechanisms of some interesting MXene-based biomedical applications. It also includes major progress, as well as key challenges of various types of MXenes and functional MXenes in conjugation with drug molecules, metallic nanoparticles, polymeric substrates, and other macromolecules. Finally, the future possibilities and challenges of this magnificent material are discussed in detail.

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Section: Biosensor and Smart Sensor Applicationsmentioning

confidence: 99%

Advances of MXenes; Perspectives on Biomedical Research

2022

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“…Tactile sensors are classified mainly by the four typical transduction mechanisms. These mechanisms are piezoresistive, capacitive, piezoelectric, and triboelectric sensing ( Figure 3 ) [ 79 ]. The key benefits of the piezoresistive tactile sensors are their high sensitivity, simplicity of structure, and low cost.…”

Section: Design Aspects Of Sensorsmentioning

confidence: 99%

“…The working principle of capacitive tactile sensors is based on the measurements of the dielectric constant, which is related to capacitance by the equation: C = εA/d , where C is the capacitance, ε is the dielectric constant, A is the area, and d is the distance between electrodes. Such tactile sensors are characterized as sensitive, able to be used for static force measurement and having a low power consumption [ 79 ]. The final result depends on the normal and shear stress, or contact pressure sensing [ 81 , 82 ].…”

Section: Design Aspects Of Sensorsmentioning

confidence: 99%

“…The final result depends on the normal and shear stress, or contact pressure sensing [ 81 , 82 ]. Regarding the aim of this review, piezoelectric sensors are less interesting, because of restrictions in the creation of high-performance tactile sensors arising due to the low piezoelectric constant of piezoelectric polymers [ 79 ]. The working principle of triboelectric tactile sensors is based on the generation of positive and negative electrostatic charges of two different materials in contact with each other via an external force [ 79 ].…”

Section: Design Aspects Of Sensorsmentioning

confidence: 99%

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Conducting Polymers for the Design of Tactile Sensors

et al. 2022

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This paper provides an overview of the application of conducting polymers (CPs) used in the design of tactile sensors. While conducting polymers can be used as a base in a variety of forms, such as films, particles, matrices, and fillers, the CPs generally remain the same. This paper, first, discusses the chemical and physical properties of conducting polymers. Next, it discusses how these polymers might be involved in the conversion of mechanical effects (such as pressure, force, tension, mass, displacement, deformation, torque, crack, creep, and others) into a change in electrical resistance through a charge transfer mechanism for tactile sensing. Polypyrrole, polyaniline, poly(3,4-ethylenedioxythiophene), polydimethylsiloxane, and polyacetylene, as well as application examples of conducting polymers in tactile sensors, are overviewed. Attention is paid to the additives used in tactile sensor development, together with conducting polymers. There is a long list of additives and composites, used for different purposes, namely: cotton, polyurethane, PDMS, fabric, Ecoflex, Velostat, MXenes, and different forms of carbon such as graphene, MWCNT, etc. Some design aspects of the tactile sensor are highlighted. The charge transfer and operation principles of tactile sensors are discussed. Finally, some methods which have been applied for the design of sensors based on conductive polymers, are reviewed and discussed.

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“…With the development of information technology, many intelligent electronic devices have been rapidly developed and widely used [ 1 , 2 , 3 , 4 ]. However, these devices, in the process of processing or applications for a long time, easily cause internal micro-cracks by mechanical, chemical and other factors, resulting in low reliability and short lifespan.…”

Section: Introductionmentioning

confidence: 99%

Near-Infrared-Light-Assisted Self-Healing Graphene-Thermopolyurethane Composite Films

Wang

Zhou

et al. 2022

Polymers

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Graphene-thermopolyurethane (G-TPU) composite films were fabricated and the effects of the TPU initial concentration, characteristics of TPU, and graphene loading on the electrical, mechanical, thermal, infrared thermal response and near-infrared-light-assisted self-healing properties of the composite films were investigated in detail. The experimental results demonstrate that the comprehensive performances of the composite film are related to the initial concentration of the TPU solution and the characteristics of the TPU and the graphene loading. The composite film prepared from TPU solution with low initial concentration can have conductivity under the condition of low graphene content. However, the composite film prepared with appropriate initial concentration of TPU solution and high graphene loading is conducive to obtain high conductivity. After 60 s of near-infrared illumination, the temperature of the composite film first increases and then decreases with the increase in graphene loading until it reaches saturation. The near-infrared light thermal response of the composite film with high graphene loading is related to the initial concentration of TPU solution, while the near-IR thermal response of the composite film with low graphene loading is independent of the initial concentration of TPU. The surface micro-cracks of the composite film almost disappeared after 10 min of near-infrared illumination. The resistance of the conductive composite film increases after healed. The composite film prepared with low melting point TPU is more favorable to obtain high near-IR thermal self-healing efficiency.

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Recent Advances in Flexible Tactile Sensors for Intelligent Systems

Cited by 61 publications

References 125 publications

Advances of MXenes; Perspectives on Biomedical Research

Advances of MXenes; Perspectives on Biomedical Research

Conducting Polymers for the Design of Tactile Sensors

Near-Infrared-Light-Assisted Self-Healing Graphene-Thermopolyurethane Composite Films

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