A flexible and highly pressure-sensitive PDMS sponge based on silver nanoparticles decorated reduced graphene oxide composite

Zhao, Xiuhua; Wei, Xu; Yi, Wangmin; Peng, Yitian

doi:10.1016/j.sna.2019.03.038

Cited by 39 publications

(19 citation statements)

References 29 publications

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“…(1) It is noteworthy that tactile sensors must be designed to produce linear signals to obtain the magnitudes and directions from multi-directional forces using Eqs. (10)(11)(12). Design improvements for linearity over a wide force range and its experimental evaluation are underway and will be provided in a future publication.…”

Section: Results and Analysismentioning

confidence: 99%

“…When compared with other sensing mechanisms, resistive sensors have advantages such as simple device structure and ease of signal processing on the acquired data [7]. In recent years, coupled with progress in the scalable production of nanomaterials, flexible resistive tactile sensors utilizing mainly conductive-nanomaterial-polymer composites have been studied [8][9][10]. To date, however, most previous works have focused on the development of tactile sensors only for normal force detection, with very few studies on multi-directional force sensing [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Polymer-based flexible and multi-directional tactile sensor with multiple NiCr piezoresistors

Pyo

Lee

Kim

et al. 2019

Micro and Nano Syst Lett

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A polymer-based tactile sensor with flexibility and multi-directional sensing capability is presented. The proposed sensor consists of a polydimethylsiloxane (PDMS) bump, a polyimide (PI) substrate, Cr/Au electrode lines for electrical connection, NiCr piezoresistors, and an SU-8 support structure. The sensing mechanism is based on piezoresistive effect, in which the resistance of NiCr changes under mechanical load. The PMDS bump positioned at the center of the sensor transfers an applied force to the PI film, and the piezoresistors are differently deformed depending on the magnitude and direction of the force. A diaphragm structure formed by the SU-8 support with a trench allows the piezoresistor to be effectively deformed. Simulation and experimental results confirm that magnitude and direction can be obtained from an arbitrarily applied force by comparing the change in resistance of each sensing element. Based on its compatibility with conventional microfabrication, the proposed sensor may be a promising candidate for a low-cost tactile sensing solution for human-machine interfaces.

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Section: Results and Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer-based flexible and multi-directional tactile sensor with multiple NiCr piezoresistors

Pyo

Lee

Kim

et al. 2019

Micro and Nano Syst Lett

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“…In piezoresistive sensors, the resistance change may rely on distinct mechanisms: Resistivity variations—in a semiconductor, as a result of band structure changes induced by pressure [ 122 ], or in composites, as a result of interparticle distance change [ 42 , 123 , 124 ]. For these cases, the following equation may be applicable (Equation (3)):

where R is the resistance, ρ is the material resistivity, l is the conductor length, and A is the transverse section area [ 121 ]; Contact resistance variations—through the modification of the geometry of the sensing element [ 19 , 31 , 125 , 126 , 127 , 128 , 129 , 130 ], by contact area changes induced in interlocked designs [ 38 , 87 , 131 , 132 , 133 , 134 , 135 , 136 ], or through contact area changes in foamy or spongy materials [ 41 , 137 , 138 ]. For these cases, the contact resistance is governed by Equation (4):

where R C is the contact resistance and F is the force [ 4 ].…”

Section: Pressure Sensorsmentioning

confidence: 99%

“…Contact resistance variations—through the modification of the geometry of the sensing element [ 19 , 31 , 125 , 126 , 127 , 128 , 129 , 130 ], by contact area changes induced in interlocked designs [ 38 , 87 , 131 , 132 , 133 , 134 , 135 , 136 ], or through contact area changes in foamy or spongy materials [ 41 , 137 , 138 ]. For these cases, the contact resistance is governed by Equation (4):

where R C is the contact resistance and F is the force [ 4 ].…”

Section: Pressure Sensorsmentioning

confidence: 99%

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

Santos

Fortunato

Martins

et al. 2020

Sensors

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Electronic skin (e-skin), which is an electronic surrogate of human skin, aims to recreate the multifunctionality of skin by using sensing units to detect multiple stimuli, while keeping key features of skin such as low thickness, stretchability, flexibility, and conformability. One of the most important stimuli to be detected is pressure due to its relevance in a plethora of applications, from health monitoring to functional prosthesis, robotics, and human-machine-interfaces (HMI). The performance of these e-skin pressure sensors is tailored, typically through micro-structuring techniques (such as photolithography, unconventional molds, incorporation of naturally micro-structured materials, laser engraving, amongst others) to achieve high sensitivities (commonly above 1 kPa−1), which is mostly relevant for health monitoring applications, or to extend the linearity of the behavior over a larger pressure range (from few Pa to 100 kPa), an important feature for functional prosthesis. Hence, this review intends to give a generalized view over the most relevant highlights in the development and micro-structuring of e-skin pressure sensors, while contributing to update the field with the most recent research. A special emphasis is devoted to the most employed pressure transduction mechanisms, namely capacitance, piezoelectricity, piezoresistivity, and triboelectricity, as well as to materials and novel techniques more recently explored to innovate the field and bring it a step closer to general adoption by society.

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“…Polydimethylsiloxane (PDMS), which is a flexible polymer with various advantages, including excellent mechanical properties, good elasticity, lightweight, processability, chemical stability, and temperature sensitivity [21][22][23][24][25], has been widely used in capacitive pressure sensors, resistive pressure sensors, and microelectromechanical system (MEMS) sensors [26][27][28]. Due to the material properties of the PDMS, it can be made to have different structures by using simple methods [29,30] and different characteristics by changing the mass ratio with the curing agent [31]. In this paper, a non-destructive optical fiber pressure sensor based on two ratios of the PDMS and an ordinary single-mode fiber is presented.…”

Section: Introductionmentioning

confidence: 99%

A Lossless Fiber Pressure Sensor Based on PDMS

et al. 2020

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Fiber optic pressure sensors have been widely used in recent decades. Most of the fiber optic pressure sensors use fiber gratings and Fabry-Perot cavity. However, they have the drawbacks of in achieving distributed sensing. In this paper, a lossless fiber pressure sensor based on a structure composed of two ratios of the polydimethylsiloxane (PDMS) and single-mode fiber is proposed. The PDMS has often been used as a flexible structural material. When the pressure is acting radially on the PDMS, the internal fiber is driven to produce an axial strain of a larger range, and the optical frequency domain reflectometer (OFDR) is used to demodulate the fiber strain. The experimental results prove that the designed sensor has a repeatable response with a sensitivity of 17.519 με/N within the range of 20 N (2548 kPa). The minimum pressure resolution and spatial resolution of the sensor can reach values of 0.5 N and 0.5 cm, respectively. Compared to a single ratio PDMS sensor, which has a non-linear response to the pressure, the range is increased by about 1.4 times. Based on the obtained results, the proposed sensor has application prospects in pressure sensors.

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A flexible and highly pressure-sensitive PDMS sponge based on silver nanoparticles decorated reduced graphene oxide composite

Cited by 39 publications

References 29 publications

Polymer-based flexible and multi-directional tactile sensor with multiple NiCr piezoresistors

Polymer-based flexible and multi-directional tactile sensor with multiple NiCr piezoresistors

Transduction Mechanisms, Micro-Structuring Techniques, and Applications of Electronic Skin Pressure Sensors: A Review of Recent Advances

A Lossless Fiber Pressure Sensor Based on PDMS

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