Multifunctional flexible and stretchable polyurethane/carbon nanotube strain sensor for human breath monitoring

Slobodian, Petr; Danova, Romana; Olejník, Robert; Matyas, Jiri; Münster, Lukáš

doi:10.1002/pat.4621

Cited by 26 publications

(20 citation statements)

References 35 publications

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“…In general, TPU-based flexible strain sensors have potential applications in physiological signal monitoring, human motion detection, facial expression and speech recognition, wearable electronics, artificial electronic skins, human−machine interfaces, etc., for their superb sensitivity, wide strain sensing range, and excellent stretchability. 32,42,44,46 4.1. Recognition of Facial Expression and Speech.…”

Section: Applications Of Tpu-based Sensorsmentioning

confidence: 99%

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Recent Advances of Flexible Strain Sensors Based on Conductive Fillers and Thermoplastic Polyurethane Matrixes

Chen

Xie

Wang

et al. 2021

ACS Appl. Polym. Mater.

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Over recent years, flexible strain sensors have been playing an increasingly important role, especially in wearable electronics, healthcare equipment, electronic skins (e-skins), and soft robots. Numerous materials are utilized in these applications; however, thermoplastic polyurethane (TPU) is prominently used for its elastomer-like behavior, suitable flexibility, and facility of combination with diverse conductive materials. These characteristics satisfy the growing demands for better stretchability, higher sensitivity, and a wider workable sensing range of flexible strain sensors. In this review paper, recent progress on TPU-based strain sensors is tracked and discussed, including carbonaceous entities, silver nanomaterials, and conductive polymers in terms of various conductive materials first. Afterward, exciting and effective designing of macro- and microstructures, as well as their influence on the performance of strain sensors, is discussed. Finally, TPU-based strain sensors’ wide applications and distinctive multifunctionality are presented and reviewed. This review paper presents the profound significance and attractive prospects of TPU-based flexible strain sensors in the design and development of intelligent devices.

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Section: Applications Of Tpu-based Sensorsmentioning

confidence: 99%

“…28,29,54,68 Furthermore, based on the results, sport T-shirts (Figure 8q) with strain sensors based on TPU for human breathing monitoring were designed. 42,87 Another point of interest would be the expectation of fabricating medical devices based on TPUbased strain sensors.…”

Section: Applications Of Tpu-based Sensorsmentioning

confidence: 99%

Recent Advances of Flexible Strain Sensors Based on Conductive Fillers and Thermoplastic Polyurethane Matrixes

Chen

Xie

Wang

et al. 2021

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

show abstract

“…By transmission electron microscopy (TEM, JEOL Ltd., Tokyo, Japan) the diameter of individual nanotubes was found to be between 10 and 60 nm and their lengths were from tens of micrometers up to 3 µm [14]. The maximum aspect ratio of the nanotubes was about 300 [13].…”

Section: Methodsmentioning

confidence: 99%

“…The current proposed solution of polymer composite highly elastic and elongation sensors brought a new generation of these deformation-electrically sensitive converters based on materials from the area of nanocomposite materials. These can be deformed in a wide range of deformations (chest deformation during breathing is in the range of units of percent to about 14%), then with high sensitivity, which can be significantly increased by chemical functionalization [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Piezoresistive Highly Elastic Sensor Based on Carbon Nanotubes for the Detection of Breath

et al. 2020

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Wearable electronic sensor was prepared on a light and flexible substrate. The breathing sensor has a broad assumption and great potential for portable devices in wearable technology. In the present work, the application of a flexible thermoplastic polyurethane/multiwalled carbon nanotubes (TPU/MWCNTs) strain sensor was demonstrated. This composite was prepared by a novel technique using a thermoplastic filtering membrane based on electrospinning technology. Aqueous dispersion of MWCNTs was filtered through membrane, dried and then welded directly on a T-shirt and encapsulated by a thin silicone layer. The sensing layer was also equipped by electrodes. A polymer composite sensor is capable of detecting a deformation by changing its electrical resistance. A T-shirt was capable of analyzing a type, frequency and intensity of human breathing. The sensitivity to the applied strain of the sensor was improved by the oxidation of MWCNTs by potassium permanganate (KMnO4) and also by subsequent application of the prestrain.

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“…Flexible strain sensors are in high demand in many areas of technology, such as biomedicine and healthcare (blood flow pulsation sensors [ 1 ], respiration detection [ 2 ], limb movement monitoring [ 3 ], muscle signal studies [ 4 ], electronic skin [ 5 ], etc.) machines [ 6 ], soft robotics [ 7 ], interactive games [ 8 ], and virtual reality [ 9 ], as well as various industrial applications (for example, wind pressure control sensors [ 10 ], piezotronic strain sensors for transistors [ 11 ], etc.).…”

Section: Introductionmentioning

confidence: 99%

Flexible Strain-Sensitive Silicone-CNT Sensor for Human Motion Detection

et al. 2022

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This article describes the manufacturing technology of biocompatible flexible strain-sensitive sensor based on Ecoflex silicone and multi-walled carbon nanotubes (MWCNT). The sensor demonstrates resistive behavior. Structural, electrical, and mechanical characteristics are compared. It is shown that laser radiation significantly reduces the resistance of the material. Through laser radiation, electrically conductive networks of MWCNT are formed in a silicone matrix. The developed sensor demonstrates highly sensitive characteristics: gauge factor at 100% elongation −4.9, gauge factor at 90° bending −0.9%/deg, stretchability up to 725%, tensile strength 0.7 MPa, modulus of elasticity at 100% 46 kPa, and the temperature coefficient of resistance in the range of 30–40 °С is −2 × 10−3. There is a linear sensor response (with 1 ms response time) with a low hysteresis of ≤3%. An electronic unit for reading and processing sensor signals based on the ATXMEGA8E5-AU microcontroller has been developed. The unit was set to operate the sensor in the range of electrical resistance 5–150 kOhm. The Bluetooth module made it possible to transfer the received data to a personal computer. Currently, in the field of wearable technologies and health monitoring, a vital need is the development of flexible sensors attached to the human body to track various indicators. By integrating the sensor with the joints of the human hand, effective movement sensing has been demonstrated.

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Multifunctional flexible and stretchable polyurethane/carbon nanotube strain sensor for human breath monitoring

Cited by 26 publications

References 35 publications

Recent Advances of Flexible Strain Sensors Based on Conductive Fillers and Thermoplastic Polyurethane Matrixes

Recent Advances of Flexible Strain Sensors Based on Conductive Fillers and Thermoplastic Polyurethane Matrixes

The Piezoresistive Highly Elastic Sensor Based on Carbon Nanotubes for the Detection of Breath

Flexible Strain-Sensitive Silicone-CNT Sensor for Human Motion Detection

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