Comparative Study of Carbon Nanotube Composites as Capacitive and Piezoresistive Pressure Sensors under Varying Conditions

Oh, Jihyeon; Kim, Dong‐Young; Kim, Hyun Woo; Hur, Oh−Nyoung; Park, Sunghoon

doi:10.3390/ma15217637

Cited by 15 publications

(10 citation statements)

References 59 publications

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“…[17] Conductive polymer composite (CPC) based piezoresistive strain sensor combining the flexibility of polymer matrix and electrical conductivity of fillers has received considerable attention due to simple signal recording, easy processing, wide application range, high precision, and wide range response. [18][19][20][21][22] When subjected to external mechanical stimuli, the deformation of these CPC sensors would cause changes in conductive paths, leading to changes in the resistance. [23][24][25] As a result, the external mechanical stimuli can be effectively transformed into an easily detected electrical responsive signal.…”

Section: Introductionmentioning

confidence: 99%

Construction of Conductive Polymer Coatings onto Flexible PDMS Foam Composites with Exceptional Mechanical Robustness for Sensitive Strain Sensing Applications

Nie,

Gu,

Zhao

et al. 2024

Advanced Sensor Research

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Flexible piezoresistive‐sensing materials with high sensitivity and stable sensing signals are highly required to meet the accurate detecting requirement for human motion. Herein, a conductive poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) / polydimethylsiloxane foam (P:P@p‐PSF) composite with strong interfacial action is designed. The porous structures and good interface combination not only show outstanding mechanical flexibility and reliability but also possess high sensitivity at a relatively wide strain range. The P:P@p‐PSF sensor achieves extreme sensitivity (Gauge Factor) of 6.25 in the subtle strain range of 1%–8%. Furthermore, the sensor forms a highly interconnected conductive network induced by the serious deformation of elastic‐interconnect pores, thus providing extremely sensitive sensing behavior for a relatively wide strain range (97.4% resistance change rate at 60% compressive strain). Moreover, the sensor presents repeatable stability and good thermal adaptation, which would meet the critical requirements of subtle vital signs, human motion monitoring, and so on. This work supplies insight into the design of a new flexible sensor material to overcome the weak interface problem and the flexible mismatch between conductive filler and matrix, showing great application potential in the field of electronic skin.

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Section: Introductionmentioning

confidence: 99%

Construction of Conductive Polymer Coatings onto Flexible PDMS Foam Composites with Exceptional Mechanical Robustness for Sensitive Strain Sensing Applications

Nie,

Gu,

Zhao

et al. 2024

Advanced Sensor Research

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“…[16,17] Among all, piezoresistive pressure sensors, which transduce the pressure signal into resistor signal, have been widely reported for their advantages of low-cost, high DOI: 10.1002/adsr.202300025 sensibility, easy signal collection and wide sensing range. [18,19,20] By integrated with flexible substrate and advanced functional materials, piezoresistive pressure sensors have earned an important place in the field of electronic skin (Eskin). [21,22,23] The key to fabricate a wearable piezoresistive pressure sensor is the flexible substrate, conductive electrodes, and active sensing materials.…”

Section: Introductionmentioning

confidence: 99%

Skin‐Integrated, Stretchable Electronic Skin for Human Motion Capturing and Pressure Mapping

Zhao

Lin

Lai

2023

Advanced Sensor Research

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Flexible and wearable electronics have been widely investigated for the extensive applications in real life. Piezoresistive based sensor is one of the common flexible electronics that could be utilized as electronic skin. By simply transducing the external pressure or stretching into resistor signal and integrated with flexible substrate and advanced functional sensing material, piezoresistive based sensors have been applied as the electronic skin. Here, a thin, skin‐integrated, and flexible electronic skin based on piezoresistive working mode is developed. Ultra‐thin polydimethylsiloxane substrate integrated with serpentine‐like Cu electrode could avoid mechanical failing of the device when it is stretched, bended, or twisted. By adopting the advanced function material, MXene, graphene and Ecoflex mixed composite, the electronic skin could sense not only a wide range of pressure from 20.8 to 132 kPa, but also stretching rate from 0% to 20%, allowing the potential application in human motion capturing. Furthermore, a 4 × 4 arrayed electronic skin is fabricated, and demonstrates the prospective application in pressure mapping.

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“…Hence, flexible pressure sensors emerge as the times require because of excellent ductility and play a major part in the field of flexible electronic devices [1,2,4,[6][7][8][9][10][11][12][13][14][15][16]. At present, flexible capacitive sensors are favored for their advantages of high sensitivity [4,14,[17][18][19], stable function [4,6,8,9,18,[20][21][22], fast dynamic response time [3,8,9,19,21,22], good recovery capability [17,[23][24][25][26][27][28] and simple structure [7,21], which are widely used in wearable electronic devices [7,8,14,16,18,19,…”

Section: Introductionmentioning

confidence: 99%

Geometric nonlinear analysis of dielectric layer based on concave paper-cut structure with zero Poisson’s ratio

Tian

Wei

Zhang

et al. 2023

Smart Mater. Struct.

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When the sensor works in a limited environment, its accuracy is easily affected by unnecessary strain loss. The key to improve accuracy is to reduce the transverse strain of the dielectric layer structure. It is an innovative technology to construct zero Poisson's ratio dielectric layer to limit the lateral strain of dielectric layer under normal pressure. The porous metamaterial dielectric layer with zero Poisson's ratio is constructed based on the paper-cutting theory. The equivalent nonlinear mechanical model is established by use of Bernoulli Euler beam theory and energy method. The analytical expressions of equivalent Poisson's ratio and equivalent Young’s modulus are given, and the necessity of considering geometric nonlinear large deformation is revealed. An improved variable step iterative method is proposed in order to solve the problem of equivalent internal force analysis caused by geometric deformation nonlinearity. The key of this method is to determine the displacement at the free end under the premise of considering the nonlinear superposition of the rigid body motion of the curved bar of the metamaterial. Based on the equivalent nonlinear mechanical model, the structural deformation characteristics of the dielectric layer structure in the linear small deformation stage and the nonlinear large deformation stage are analyzed. The results of theoretical, finite element simulation and experimental research reveal the necessity of considering geometric nonlinear factors in the practical application of the structure, which means that the foundation is theoretically and experimentally laid for the design of porous elastic dielectric layer of flexible capacitive pressure sensor.

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Comparative Study of Carbon Nanotube Composites as Capacitive and Piezoresistive Pressure Sensors under Varying Conditions

Cited by 15 publications

References 59 publications

Construction of Conductive Polymer Coatings onto Flexible PDMS Foam Composites with Exceptional Mechanical Robustness for Sensitive Strain Sensing Applications

Construction of Conductive Polymer Coatings onto Flexible PDMS Foam Composites with Exceptional Mechanical Robustness for Sensitive Strain Sensing Applications

Skin‐Integrated, Stretchable Electronic Skin for Human Motion Capturing and Pressure Mapping

Geometric nonlinear analysis of dielectric layer based on concave paper-cut structure with zero Poisson’s ratio

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