Carbon nanotubes based multi-directional strain sensor

Santos, A.; Amorim, Luís Manuel Machado; Nunes, João Arriscado; Silva, A.F.; Viana, J. C.

doi:10.1016/j.mseb.2022.115937

Cited by 8 publications

(3 citation statements)

References 12 publications

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“…Advantageously, such sensors can be easily fabricated and are characterized by controllable sensitivity and high reliability, making them suitable for wearable sensing devices. Nevertheless, enhanced sensitivity and reliability remain the goals in the development of piezoresistive sensors. − ,− However, despite advances in their sensing performance, most reported strain sensors can only detect mechanical deformation in a single preset direction, which hinders their application in evaluating complex multidimensional strains. , Consequently, various research groups have proposed solutions for addressing these issues, such as the introduction of a unidirectional pattern structure into the sensing medium or a one-axial arrangement of conductive fillers in strain sensors to enable the detection of stresses applied in multiple axial directions. − For example, by coating silver nanowires onto an elastomer and introducing a unidirectional wave structure, Ko group achieved a sensor that detects the strain direction . Kim group reported a related study in which conductive fiber structures with high unidirectional alignment were obtained via the controlled electrospinning of carbon nanofibers. , These studies exploited the variation of the electrical signals depending on the structural changes in the conductive filler used as a sensing element in a strain sensor, which results from stimulation of the strain-sensing media in a specific direction.…”

Section: Introductionmentioning

confidence: 99%

Advanced Multiparallel-Connected Piezoresistive Physical Sensors: Elevating Performance Reliability of Flexible Strain and Pressure Sensors

Seo,

Li,

Tsogbayar

et al. 2024

ACS Appl. Mater. Interfaces

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A physical sensor with a sensing medium comprising multiparallel-connected (MPC) piezoresistive pathways in both the vertical and horizontal directions was developed to achieve improved sensing performance. The MPC sensing medium reduces the total resistance and offsets noise, offering enhanced signal stability and device reliability and providing a high-performance sensing platform. The signal change and gauge factor (GF) of the 3PW-5L strain sensor (comprising three lines and five layers of piezoresistive pathways horizontally and vertically, respectively) were, respectively, 5.9 and 4.7 times higher than those of the 1PW-1L sensor composed of a monosensing pathway; the hysteresis of the detected signal was also significantly reduced. The linearity of the detected signal increased from 0.912 for 1PW-1L to 0.995 for 3PW-5L, indicating a greater sensing reliability. The direction of the applied tensile strain was successfully detected using the MPC sensing medium with an orthogonal configuration. The MPC piezoresistive sensor composing vertically stacked piezoresistive pathways demonstrated excellent performance as a pressure sensor; the 3PW-5L pressure sensor afforded a GF of 0.121 ± 0.002 kPa −1 with a linearity of 0.998 under an applied pressure ≥16.4 kPa. The MPC piezoresistive physical sensor offers a superior sensing performance and should contribute to the future development of wearable sensors and electronic devices.

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Section: Introductionmentioning

confidence: 99%

Advanced Multiparallel-Connected Piezoresistive Physical Sensors: Elevating Performance Reliability of Flexible Strain and Pressure Sensors

Seo,

Li,

Tsogbayar

et al. 2024

ACS Appl. Mater. Interfaces

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“…Generally, when CNTs sensors are stretched, the contact area between the conductive materials decreases and the tunneling distance increases, leading to an increase in resistance, which means that the sensor reflects its strain signal in the form of an electrical signal [13,[40][41][42]. Chen et al [13] prepared a stretchable sandwich-like strain sensor by a CNTs dispersion spray-coated to PDMS (0.16 mg/cm 2 CNTs in the conductive layer), which had a good optical transmittance of 53.1% at 550 nm and a wide sensing range of more than 130%.…”

Section: Introductionmentioning

confidence: 99%

“…The strain sensor exhibited self-healing ability, self-adhesiveness, high sensitivity, linearity, low hysteresis, and long-term durability, with a gauge factor of 33.99 at 55% strain. Santos et al [42] produced vertically aligned CNTs forests by chemical vapor deposition and then mechanically knocked down the aligned CNTs onto polyimide (PI) films to fabricate a flexible strain sensor. The results showed it was possible to quantify and indicate strain in three directions with only a small aligned CNTs patch.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin CNTs Film Based on Marangoni Effect for Strain Sensing Application

et al. 2023

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The Marangoni effect has been applied in the preparation of large-area ultrathin films. However, defects occur frequently during the transfer progress of ultrathin films to substrates, which limits its application in scalable and massive fabrication. Carbon nanotubes (CNTs), as typical one-dimensional carbon materials, are widely used in wearable and flexible sensors due to their outstanding electrical and mechanical properties. In this paper, Marangoni-driven self-assembled CNTs film was obtained by injecting 0.5 mL 1 mg·mL−1 CNTs/ethanol dispersion on 100 cm2 water dropwise; the thickness, sheet resistance, and optical transmittance (at 550 nm) of the as-prepared ultrathin film were 38 nm, 7.3 kΩ/□, and 66.9%, respectively. The CNTs film was transferred onto polydimethylsiloxane (PDMS) to prepare a conductive composite of CNTs/PDMS film and the sheet resistance of the composite film reached 21.0 kΩ/□. Furthermore, the packaged PDMS/CNTs/PDMS (PCP) strain sensors with a sandwich-like structure exhibited satisfactory sensitivity with a gauge factor of 3.4 at 50% strain, a large working range (89%), and excellent stability (>8000 cycles). The easy-making and low-cost sensors show great potential in wearable electronics, real-time motion detection, and electronic skin.

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Durable TPU/PDA/MXene Fiber‐Based Strain Sensors with High Strain Range and Sensitivity

Cheng,

Zhang,

Zhang

et al. 2024

ChemistrySelect

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With the development of the ageing society, wearable strain sensors have great application prospects in the fields of health detection, artificial intelligence, and motion recognition. However, traditional forms of film‐like strain sensors suffer from low sensitivity, adhesion, and impermeability during use, which severely limit their practical applications. To overcome these problems, we propose a strategy to fabricate polyurethane/polydopamine/MXene (TPU/PDA/MXene) composite fibers by wet spinning. Furthermore, the outside is wrapped with (PDMS), giving mechanical strength and chemical resistance. Through a simple and low‐cost wet spinning process, TPU/PDA/MXene fibers are achieved in the preparation of flexible strain sensors, and they can be woven into various forms with good flexibility and comfort according to practical needs. The results indicated that the prepared flexible strain sensor exhibits a high gauge factor (GF) of 57.15 over a large strain range (300 %), which are superior to those of many fiber‐based sensors. Their application properties were also measured by attaching them to fingers, wrists and knees, showing high sensitivity, mechanical durability and chemical stability, and has great potential for wearable strain sensors and flexible strain sensors in complex environments.

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Carbon nanotubes based multi-directional strain sensor

Cited by 8 publications

References 12 publications

Advanced Multiparallel-Connected Piezoresistive Physical Sensors: Elevating Performance Reliability of Flexible Strain and Pressure Sensors

Advanced Multiparallel-Connected Piezoresistive Physical Sensors: Elevating Performance Reliability of Flexible Strain and Pressure Sensors

Ultrathin CNTs Film Based on Marangoni Effect for Strain Sensing Application

Durable TPU/PDA/MXene Fiber‐Based Strain Sensors with High Strain Range and Sensitivity

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