Batch fabricated flexible tactile sensor based on carbon nanotube-polymer composites

Pyo, Soonjae; Lee, J.-I; Kim, M.-O; Chung, Taek; Oh, Youngseok; Lim, Sangho; Park, J.

doi:10.1109/transducers.2013.6626939

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Recently, Pyo et al [ 33 ] have proposed a flexible tactile sensor based on four CNT-PDMS sensing parts placed on a polyimide substrate with Cr/Au interdigitated electrodes and surmounted by a bump structure made of SU-8. In details, a 2% in weight of CNTs were dispersed into the PDMS copolymer by further addition of curing agent at a ratio 1:10 with respect to the CNT-PDMS mixture.…”

Section: Percolation Mechanismmentioning

confidence: 99%

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Stassi

Cauda

Canavese

et al. 2014

Sensors

358

238

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The large expansion of the robotic field in the last decades has created a growing interest in the research and development of tactile sensing solutions for robot hand and body integration. Piezoresistive composites are one of the most widely employed materials for this purpose, combining simple and low cost preparation with high flexibility and conformability to surfaces, low power consumption, and the use of simple read-out electronics. This work provides a review on the different type of composite materials, classified according to the conduction mechanism and analyzing the physics behind it. In particular piezoresistors, strain gauges, percolative and quantum tunnelling devices are reviewed here, with a perspective overview on the most used filler types and polymeric matrices. A description of the state-of-the-art of the tactile sensor solutions from the point of view of the architecture, the design and the performance is also reviewed, with a perspective outlook on the main promising applications.

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Section: Percolation Mechanismmentioning

confidence: 99%

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Stassi

Cauda

Canavese

et al. 2014

Sensors

358

238

View full text Add to dashboard Cite

show abstract

“…CNT-PDMS composite was produced by the simple solvent evaporation method as shown in figure 3 [17]. It is difficult to disperse CNTs uniformly within the PDMS matrix if they are directly mixed, as individual CNTs tend to agglomerate together in a viscous fluid.…”

Section: Cnt-pdms Compositementioning

confidence: 99%

Development of a flexible three-axis tactile sensor based on screen-printed carbon nanotube-polymer composite

Pyo

Lee

Kim

et al. 2014

J. Micromech. Microeng.

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A flexible, three-axis carbon nanotube (CNT)–polymer composite-based tactile sensor is presented. The proposed sensor consists of a flexible substrate, four sensing cells, and a bump structure. A CNT–polydimethylsiloxane (PDMS) composite is produced by a solvent evaporation method, and thus, the CNTs are well-dispersed within the PDMS matrix. The composite is directly patterned onto a flexible substrate using a screen printing technique to fabricate a sensor with four sensing cells. When a force is applied on the bump, the magnitude and direction of force could be detected by comparing the changes in electrical resistance of each sensing cell caused by the piezoresistive effect of the composite. The experimentally verified sensing characteristics of the fabricated sensor exhibit a linear relationship between the resistance change and the applied force, and the measured sensitivities of the sensor for the normal and shear forces are 6.67 and 86.7%/N for forces up to 2.0 and 0.5 N, respectively. Experiments to verify the load-sensing repeatability show a maximum 2.00% deviation of the resistance change within the tested force range.

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“…When approaching percolation threshold, MWNTs can not only improve the sensitive of piezoresistive composite much more than other allotropes but also decrease the influence on the impedance from ambient temperature [ 20 ]. A large amount of research has already been reported about the application of MWNTs/polymer composite in developing strain and force sensors in which the sensitive elements are fabricated in bulk size [ 6 , 21 , 22 ]; however, in this paper, a novel tactile sensor with the sensitive element in thin aligned fibers form is described. Thin fiber in sub-micrometer diameter not only constrains the dispersion of MWNTs and increases their alignment as well as electrospinning progress does [ 23 ], but also the drum collector arranges the polymer fibers parallel so that MWNTs in different fibers remain in the same orientation which makes SEs show anisotropy in electricity (see Section 4 ).…”

Section: Sensor Mechanism and Designmentioning

confidence: 99%

“…Among these mechanisms, the piezoresistive method is prevalent for its simple and low-cost preparation process with good flexibility [ 5 ]. Moreover, piezoresistive composite materials made up of the polymeric matrix and conductive fillers have been widely studied over the last decades because of their higher sensitivity and higher compatibility with complex curves than rigid materials such as microelectromechanical systems (MEMS) piezoresistors [ 6 , 7 , 8 ]. Although the composites are intrinsically sensitive and flexible, the bulky size (especially in the thick direction) of these materials would impede the full utilization of these good properties [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Flexible Tactile Sensor Array Based on Aligned MWNTs-PU Composited Sub-Microfibers

et al. 2018

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This present paper describes a novel method to fabricate tactile sensor arrays by producing aligned multi-walled carbon nanotubes (MWNTs)-polyurethane (PU) composite sub-microfiber (SMF) arrays with the electrospinning technique. The proposed sensor was designed to be used as the artificial skin for a tactile sensation system. Although thin fibers in micro- and nanoscale have many good mechanical characteristics and could enhance the alignment of MWNTs inside, the high impedance as a consequence of a small section handicaps its application. In this paper, unidirectional composite SMFs were fabricated orthogonally to the parallel electrodes through a low-cost method to serve as sensitive elements (SEs), and the impedances of SEs were measured to investigate the changes with deformation caused by applied force. The particular piezoresistive mechanism of MWNTs disturbed in SMF was analyzed. The static and dynamic test results of the fabricated tactile sensor were also presented to validate the performance of the proposed design.

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Batch fabricated flexible tactile sensor based on carbon nanotube-polymer composites

Cited by 8 publications

References 17 publications

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Flexible Tactile Sensing Based on Piezoresistive Composites: A Review

Development of a flexible three-axis tactile sensor based on screen-printed carbon nanotube-polymer composite

Flexible Tactile Sensor Array Based on Aligned MWNTs-PU Composited Sub-Microfibers

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