Retracted Article: 3D printed highly flexible strain sensor based on TPU–graphene composite for feedback from high speed robotic applications

Gul, Jahan Zeb; Sajid, Memoon; Choi, Kyung Hyun

doi:10.1039/c8tc03423k

Cited by 55 publications

(27 citation statements)

References 28 publications

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“…125 Thermoplastic elastomers like TPU are known for their excellent processability and can be used for the fabrication of conductive filaments that consist of the elastomer and a conductive filler with the purpose of being used in FDM 3D printing. 126 Chris et al pioneered in the field of FDM 3D…”

Section: Materials Choices For Additive Manufacturing Of Piezoresistive Elastomer-based Strain Sensorsmentioning

confidence: 99%

Piezoresistive Elastomer-Based Composite Strain Sensors and Their Applications

Georgopoulou

Clemens

2020

ACS Appl. Electron. Mater.

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Piezoresistive strain sensors dominate the field of soft elastomer sensors, with many interesting findings and applications. Nevertheless, the methods of characterizing the performance of the sensor differ in each study, leading to different conclusions and comparing with the different sensor systems is challenging. In this attempt, the most important characterization methods of the sensor response are being presented and some cases of elastomer strain sensor are being highlighted. Furthermore, the different materials options for elastomer strain sensors are being shown with a special section for the rapidly growing field of additive manufacturing and 3D printing. Except from the material choices and testing methods, different applications of the strain sensor are presented. From the biomedical field, these soft sensors find

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Section: Materials Choices For Additive Manufacturing Of Piezoresistive Elastomer-based Strain Sensorsmentioning

confidence: 99%

Piezoresistive Elastomer-Based Composite Strain Sensors and Their Applications

Georgopoulou

Clemens

2020

ACS Appl. Electron. Mater.

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“…The 2D band is located at 2698 cm −1 . The G band appears at 1584 cm −1 , due to the stretching vibration of sp 2 hybridized carbon atoms [56][57][58][59]. The characteristic peaks of TPU may become weaker and even disappear with the loading of grapheme [56,57].…”

Section: Raman Spectrummentioning

confidence: 99%

“…The G band appears at 1584 cm −1 , due to the stretching vibration of sp 2 hybridized carbon atoms [56][57][58][59]. The characteristic peaks of TPU may become weaker and even disappear with the loading of grapheme [56,57]. The weak peak at 880 cm −1 is assigned to the stretching vibrations of CH 2 .…”

Section: Raman Spectrummentioning

confidence: 99%

Stretchable Strain Sensor for Human Motion Monitoring Based on an Intertwined-Coil Configuration

et al. 2020

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Wearable electronics, such as sensors, actuators, and supercapacitors, have attracted broad interest owing to their promising applications. Nevertheless, practical problems involving their sensitivity and stretchability remain as challenges. In this work, efforts were devoted to fabricating a highly stretchable and sensitive strain sensor based on dip-coating of graphene onto an electrospun thermoplastic polyurethane (TPU) nanofibrous membrane, followed by spinning of the TPU/graphene nanomembrane into an intertwined-coil configuration. Owing to the intertwined-coil configuration and the synergy of the two structures (nanoscale fiber gap and microscale twisting of the fiber gap), the conductive strain sensor showed a stretchability of 1100%. The self-inter-locking of the sensor prevents the coils from uncoiling. Thanks to the intertwined-coil configuration, most of the fibers were wrapped into the coils in the configuration, thus avoiding the falling off of graphene. This special configuration also endowed our strain sensor with an ability of recovery under a strain of 400%, which is higher than the stretching limit of knees and elbows in human motion. The strain sensor detected not only subtle movements (such as perceiving a pulse and identifying spoken words), but also large movements (such as recognizing the motion of fingers, wrists, knees, etc.), showing promising application potential to perform as flexible strain sensors.

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“…Currently, three major types of strategies are used for the fabrication of stretchable strain sensor, viz., the direct blending of conductive filler with a polymer matrix before forming, [ 13 ] coating/printing the sensing materials on an elastomer substrate, [ 9,10,14 ] and filling the precursor of the elastomer into a pre‐created conductive scaffold. [ 15 ] For the first case, a high filler loading and good filler dispersion are necessary to form a reliable conductive network.…”

Section: Introductionmentioning

confidence: 99%

High‐Performance Stretchable Strain Sensor Based on Ag Nanoparticles Sandwiched between Two 3D‐Printed Polyurethane Fibrous Textiles

Han

Xiao

Wen

et al. 2021

Adv Elect Materials

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Developing stretchable strain sensors with high stretchability as well as sensitivity via a scalable technique is still a challenge that remains to be addressed. Herein, high‐performance stretchable strain sensors based on Ag nanoparticles (NPs) sandwiched between two thermoplastic polyurethane (TPU) fibrous textiles are fabricated by combining 3D‐printed TPU elastomer and solution‐coated Ag NP pulp, in which a conductive network is formed at a low loading of 4.3 wt% Ag NPs. The printed TPU fibers in each textile are arranged in parallel, while perpendicular to each other between the upper and lower textiles, forming an oblique lattice structure with their diagonal being the same direction as the external force. Under stretching, the deformed TPU fibers in the upper and lower textiles squeezed Ag NPs to undergo shearing motion, such that the disconnected electrical circuit can be compensated by some Ag NPs to retain the electrical pathway. Consequently, the printed TPU/Ag strain sensors showed high sensitivity (gauge factor of 38220 at a strain of 120–138%), wide working strain range (0–138%), and long‐term durability (>2500 cycles at 50% strain). Their promise as flexible electronic components is demonstrated in wearable motion detection systems for monitoring human motions and recognizing facial expressions.

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Retracted Article: 3D printed highly flexible strain sensor based on TPU–graphene composite for feedback from high speed robotic applications

Abstract: A novel, highly flexible and electrically resistive-type strain sensor with a special three-dimensional conductive network was 3D printed using a composite of conductive graphene pellets and flexible thermoplastic polyurethane (TPU) pellets.

Cited by 55 publications

References 28 publications

Piezoresistive Elastomer-Based Composite Strain Sensors and Their Applications

Piezoresistive Elastomer-Based Composite Strain Sensors and Their Applications

Stretchable Strain Sensor for Human Motion Monitoring Based on an Intertwined-Coil Configuration

High‐Performance Stretchable Strain Sensor Based on Ag Nanoparticles Sandwiched between Two 3D‐Printed Polyurethane Fibrous Textiles

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