Готові списки джерел за темами / Stretchable strain sensors

Добірка наукової літератури з теми "Stretchable strain sensors"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Stretchable strain sensors"

1

Alsharari, Meshari, Baixin Chen, and Wenmiao Shu. "3D Printing of Highly Stretchable and Sensitive Strain Sensors Using Graphene Based Composites." Proceedings 2, no. 13 (December 21, 2018): 792. http://dx.doi.org/10.3390/proceedings2130792.

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Анотація:
In this research, we present the development of 3D printed, highly stretchable and sensitive strain sensors using Graphene based composites. Graphene, a 2D material with unique electrical and piezoresistive properties, has already been used to create highly sensitive strain sensors. In this new study, by co-printing Graphene based Polylactic acid (PLA) with thermoplastic polyurethane (TPU), a highly stretchable and sensitive strain sensor based on Graphene composites can be 3D printed for the first time in strain sensors. The fabrication process of all materials is fully compatible with fused deposition modeling (FDM) based 3D printing method, which makes it possible to rapidly prototype and manufacture highly stretchable and sensitive strain sensors. The mechanical properties, electrical properties, sensitivity of the 3D printed sensors will be presented.
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2

Yen, Yu-Hsin, Chao-Shin Hsu, Zheng-Yan Lei, Hsin-Jou Wang, Ching-Yuan Su, Ching-Liang Dai, and Yao-Chuan Tsai. "Laser-Induced Graphene Stretchable Strain Sensor with Vertical and Parallel Patterns." Micromachines 13, no. 8 (July 29, 2022): 1220. http://dx.doi.org/10.3390/mi13081220.

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Анотація:
In intelligent manufacturing and robotic technology, various sensors must be integrated with equipment. In addition to traditional sensors, stretchable sensors are particularly attractive for applications in robotics and wearable devices. In this study, a piezoresistive stretchable strain sensor based on laser-induced graphene (LIG) was proposed and developed. A three-dimensional, porous LIG structure fabricated from polyimide (PI) film using laser scanning was used as the sensing layer of the strain sensor. Two LIG pattern structures (parallel and vertical) were fabricated and integrated within the LIG strain sensors. Scanning electron microscopy, an X-ray energy dispersive spectrometer, and Raman scattering spectroscopy were used to examine the microstructure of the LIG sensing layer. The performance and strain sensing properties of the parallel and vertical stretchable LIG strain sensors were investigated in tensile tests. The relative resistance changes and the gauge factors of the parallel and vertical LIG strain sensors were quantified. The parallel strain sensor achieved a high gauge factor of 15.79 in the applied strain range of 10% to 20%. It also had high sensitivity, excellent repeatability, good durability, and fast response times during the tensile experiments. The developed LIG strain sensor can be used for the real-time monitoring of human motions such like finger bending, wrist bending, and throat swallowing.
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3

Jin Nam, Hyun, Jin Yeong Park, Van-Phu Vu, and Sung-Hoon Choa. "Effects of Binder and Substrate Materials on the Performance and Reliability of Stretchable Nanocomposite Strain Sensors." Journal of Nanoscience and Nanotechnology 21, no. 5 (May 1, 2021): 2969–79. http://dx.doi.org/10.1166/jnn.2021.19133.

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Анотація:
In stretchable strain sensors, highly elastic elastomers such as polydimethylsiloxane (PDMS), Ecoflex, and polyurethane are commonly used for binder materials of the nanocomposite and substrates. However, the viscoelastic nature of the elastomers and the interfacial action between nanofillers and binders influence the critical sensor performances, such as repeatability, response, and hysteresis behavior. In this study, we developed a stretchable nanocomposite strain sensor composed of multiwalled carbon nanotubes and a silicone elastomer binder. The effects of binder and substrate materials on the repeatability, response, hysteresis behavior, and long-term endurance of the strain sensors were systematically investigated using stretching, bending, and repeated cyclic bending tests. Three different binder and substrate materials including PDMS, Ecoflex, and a mixture of PDMS/Ecoflex were tested. The stretchable strain sensors showed an excellent linearity and stretchability of more than 130%. Therefore, the long-term endurance of the strain sensors fabricated with Ecoflex binder should be improved. The strain sensors fabricated with Ecoflex binder showed a relatively large variation in electrical resistance during 10,000-cycle bending tests and repeatability errors at large bending angles. The strain sensors fabricated with PDMS binder showed repeatability errors at small bending angles and a slight response delay of 1 second. On the contrary, the strain sensors fabricated with a mixture of PDMS/Ecoflex binder showed excellent repeatability and response characteristics. The PDMS material showed hysteresis behavior; therefore, the strain sensors fabricated with PDMS binder on PDMS substrate exhibited a large hysteresis behavior in the first stretch–release cycle. It was found that the hysteresis behavior of the strain sensors was mainly dependent on substrate materials than on binder materials. The stretchable strain sensors made of the mixture of PDMS/Ecoflex exhibited excellent repeatability, response, hysteresis behavior, and excellent capability in detecting finger and wrist bending.
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4

Sheeja Prakash, Karthika, Hermann Otto Mayr, Prachi Agrawal, Priyank Agarwal, Michael Seidenstuecker, Nikolaus Rosenstiel, Peter Woias, and Laura Maria Comella. "Batch Fabrication of a Polydimethylsiloxane Based Stretchable Capacitive Strain Gauge Sensor for Orthopedics." Polymers 14, no. 12 (June 8, 2022): 2326. http://dx.doi.org/10.3390/polym14122326.

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Анотація:
Polymer-based capacitive strain gauges are a novel and promising concept for measuring large displacements and strains in various applications. These novel sensors allow for high strain, well above the maximum values achieved with state-of-the-art strain gauges (Typ. 1%). In recent years, a lot of interest in this technology has existed in orthopedics, where the sensors have been used to measure knee laxity caused by a tear of the anterior cruciate ligament (ACL), and for other ligament injuries. The validation of this technology in the field has a very low level of maturity, as no fast, reproducible, and reliable manufacturing process which allows mass production of sensors with low cost exists. For this reason, in this paper, a new approach for the fabrication of polymer-based capacitive strain gauges is proposed, using polydimethylsiloxane (PDMS) as base material. It allows (1) the fast manufacturing of sensor batches with reproducible geometry, (2) includes a fabrication step for embedding rigid electrical contacts on the sensors, and (3) is designed to produce sensor batches in which the size, the number, and the position of the sensors can be adapted to the patient’s anatomy. In the paper, the process repeatability and the robustness of the design are successfully proven. After 1000 large-strain elongation cycles, in the form of accelerated testing caused much higher strains than in the above-mentioned clinical scenario, the sensor’s electrical contacts remained in place and the functionalities were unaltered. Moreover, the prototype of a patient customizable patch, embedding multiple sensors, was produced.
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5

Li, Jinhui, Guoping Zhang, Rong Sun, and C. P. Wong. "Three-Dimensional Graphene-Based Composite for Elastic Strain Sensor Applications." MRS Advances 1, no. 34 (2016): 2415–20. http://dx.doi.org/10.1557/adv.2016.508.

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Анотація:
ABSTRACTFlexible electronics has emerged as a very promising field, in particular,wearable, bendable, and stretchable strain sensors with high sensitivity which could be used for human motion detection, sports performance monitoring, etc. In this paper, a highly stretchable and sensitive strain sensor composed of reduced graphene oxide foam and elastomer composite is fabricated by assembly and followed by a polymer immersing process. The strain sensor has demonstrated high stretchability and sensitivity. Furthermore, the device was employed for gauging muscle-induced strain which results in high sensitivity and reproducibility. The developed strain sensors showed great application potential in fields of biomechanical systems.
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6

Hwangbo, Yuhwan, Hyun Jin Nam, and Sung-Hoon Choa. "Highly Stretchable Strain Sensor with a High and Broad Sensitivity Composed of Carbon Nanotube and Ecoflex Composite." Korean Journal of Metals and Materials 61, no. 7 (July 5, 2023): 500–508. http://dx.doi.org/10.3365/kjmm.2023.61.7.500.

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Анотація:
Wearable strain sensors with high and broad sensitivity, high stretchability and excellent mechanical endurance will be widely useful in smart wearable electronics. In this work, we developed a stretchable strain sensor fabricated with a simple stencil printing technique. The stretchable strain sensor was fabricated using a multi-walled carbon nanotubes (MWCNTs)-Ecoflex composite paste on an Ecoflex substrate. In particular, using IPA solvent, CNT particles were uniformly dispersed in the Ecoflex binder. The effect of the amount of Ecoflex resin on the stretchability and sensitivity of the sensor were also investigated. It was found that as the amount of Ecoflex resin increased, the stretchability of the sensor increased. The fabricated stretchable strain sensor showed a maximum stretchability of 1,000% with a wide sensitivity range from 3 to 12,287. The hysteresis tests indicated that the hysteresis of the fabricated stretchable strain sensor was very small, the electrical resistances of the sensors quickly returned to original value after tests. The strain sensor showed excellent mechanical durability during cyclic repeated tensile tests of 400,000 cycles. The results of the cross-cut adhesion tests indicated that the adhesion strength between the sensor composite layer and Ecoflex substrate was excellent. We also demonstrated the potential application of the stretchable sensor in wearable electronics by bending tests on a human finger and wrist.
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7

Chen, Hui, Han Wang, Peilun Yu, and Xiaoyang Yang. "Wearable Strain Sensors and Their Applications." SHS Web of Conferences 157 (2023): 03029. http://dx.doi.org/10.1051/shsconf/202315703029.

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Анотація:
Wearable and stretchable strain sensors have received much attention because of their easy interaction with the human body. They are widely used in many fields, such as healthcare monitoring and human motion detection. Recent advances in the design and implementation of wearable and stretchable strain sensors and their application prospects are summarized herein. The research on sensitive strain sensors will be introduced herein first, which mainly involves the application of nanomaterials in the strain sensor. The remarkable properties of nanomaterials enable the carbon nanotube sensor to be embedded in socks, gloves, bandages, and other items that can be attached to the human body to accurately monitor various movements of the human body, including training, breathing, typing, and speaking. And then, we will focus on the application prospects of wearable strain sensors. With the development of the Times and the progress of science and technology, wearable strain sensors are gradually applied to various fields, especially in intelligent medical treatment, sports and fitness, and entertainment. Although the research on wearable strain sensor has produced considerable progress so far, it is still in the prototype stage, and wearable strain sensor still faces significant challenges in manufacturing a multi-functional integrated strain sensor. The research of this paper will be of great value to the study and application of wearable strain sensors.
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8

Qi, Zhenkun, Hailiang Bian, Yi Yang, Nantian Nie, and Fuliang Wang. "Graphene/Glycerin Solution-Based Multifunctional Stretchable Strain Sensor with Ultra-High Stretchability, Stability, and Sensitivity." Nanomaterials 9, no. 4 (April 16, 2019): 617. http://dx.doi.org/10.3390/nano9040617.

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Анотація:
Highly stretchable, flexible, and sensitive strain sensors have promising applications in motion detection—especially multifunctional strain sensors that can detect stretching, bending, compression and twisting. Herein, this study presents a graphene and glycerol solution-based multifunctional sensor with ultra-high stretchability and sensitivity. Owing to the self-lubrication and fluidity of the graphene-glycerol solution, the strain sensors display super stretchability up to 1000%, a maximum gauge factor up to 45.13, and excellent durability for over 10,000 cycles. In addition, the sensor can also rapidly respond to small strains (1%, 5%, 10%) and different stretching rates (12.5%/s, 25%/s, 50%/s, and 100%/s). More impressively, the sensors can measure up to 50 kPa pressure and 180° twisting without any damage. Furthermore, the strain sensors demonstrate their applicability in scenarios involving motion detection, such as that for finger bending, wrist rotating, touching, and drinking water.
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9

Wang, Guishan, Ying Liu, Fangsong Xu, Guanjun Liu, and Jing Qiu. "Design and optimization of isotropic stretchable strain sensors for multidirectional monitoring." Smart Materials and Structures 31, no. 1 (November 19, 2021): 015009. http://dx.doi.org/10.1088/1361-665x/ac319e.

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Анотація:
Abstract Multidirectional monitoring is highly expectable for stretchable strain sensors by which the randomly orientated cracks or the maximum strain of all directions need to be accommodated. Many current types of research exploit laminated sensors and rosette designs to obtain the desired behavior in several discrete directions. However, this can lead to complex fabricating and resolving processes, as well as significant measurement errors. Our work proposes an isotropic stretchable strain (ISS) sensor that utilizes the in-plane curved sensing film from graphene/silver nanowires (AgNWs), which exhibits uniform sensitivity in all directions within 30∘ and the potential extending to 360∘. The ISS sensor, whose curved shape is optimized based on splines and the quantitative sensing model, is fabricated by a flash stamp machine and followed by vacuum filtration. Experimental results show that the ISS sensor possesses equivalent sensing properties in 30∘ with excellent linearity and durability. Thus our customized sensor is applied to multidirectionally monitor the stretchable surface without consideration for the sensor orientation and the resolving process. Most importantly, the ISS sensor and its design method provide an efficient route for future sensor design with expected properties, not limited to isotropy.
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10

Hwang, Sungkun, Recep M. Gorguluarslan, Hae-Jin Choi, and Seung-Kyum Choi. "Integration of Dimension Reduction and Uncertainty Quantification in Designing Stretchable Strain Gauge Sensor." Applied Sciences 10, no. 2 (January 16, 2020): 643. http://dx.doi.org/10.3390/app10020643.

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Анотація:
Interests in strain gauge sensors employing stretchable patch antenna have escalated in the area of structural health monitoring, because the malleable sensor is sensitive to capturing strain variation in any shape of structure. However, owing to the narrow frequency bandwidth of the patch antenna, the operation quality of the strain sensor is not often assured under structural deformation, which creates unpredictable frequency shifts. Geometric properties of the stretchable antenna also severely regulate the performance of the sensor. Especially rugged substrate created by printing procedure and manual fabrication derives multivariate design variables. Such design variables intensify the computational burden and uncertainties that impede reliable analysis of the strain sensor. In this research, therefore, a framework is proposed not only to comprehensively capture the sensor’s geometric design variables, but also to effectively reduce the multivariate dimensions. The geometric uncertainties are characterized based on the measurements from real specimens and a Gaussian copula is used to represent them with the correlations. A dimension reduction process with a clear decision criterion by entropy-based correlation coefficient dwindles uncertainties that inhibit precise system reliability assessment. After handling the uncertainties, an artificial neural network-based surrogate model predicts the system responses, and a probabilistic neural network derives a precise estimation of the variability of complicated system behavior. To elicit better performance of the stretchable antenna-based strain sensor, a shape optimization process is then executed by developing an optimal design of the strain sensor, which can resolve the issue of the frequency shift in the narrow bandwidth. Compared with the conventional rigid antenna-based strain sensors, the proposed design brings flexible shape adjustment that enables the resonance frequency to be maintained in reliable frequency bandwidth and antenna performance to be maximized under deformation. Hence, the efficacy of the proposed design framework that employs uncertainty characterization, dimension reduction, and machine learning-based behavior prediction is epitomized by the stretchable antenna-based strain sensor.
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Більше джерел

Дисертації з теми "Stretchable strain sensors"

1

Yao, Shulong. "Highly Stretchable Miniature Strain Sensor for Large Dynamic Strain Measurement." Thesis, University of North Texas, 2016. https://digital.library.unt.edu/ark:/67531/metadc849674/.

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Анотація:
This thesis aims to develop a new type of highly stretchable strain sensor to measure large deformation of a specimen subjected to dynamic loading. The sensor was based on the piezo-resistive response of carbon nanotube(CNT)/polydimethysiloxane (PDMS) composites thin films, some nickel particles were added into the sensor composite to improve the sensor performance. The piezo-resistive response of CNT composite gives high frequency response in strain measurement, while the ultra-soft PDMS matrix provides high flexibility and ductility for large strain measuring large strain (up to 26%) with an excellent linearity and a fast frequency response under quasi-static test, the delay time for high strain rate test is just 30 μs. This stretchable strain sensor is also able to exhibit much higher sensitivities, with a gauge factor of as high as 80, than conventional foil strain gauges.
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2

Melzer, Michael. "Stretchable Magnetoelectronics." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-191026.

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Анотація:
In this work, stretchable magnetic sensorics is successfully established by combining metallic thin films revealing a giant magnetoresistance effect with elastomeric materials. Stretchability of the magnetic nanomembranes is achieved by specific morphologic features (e.g. wrinkles), which accommodate the applied tensile deformation while maintaining the electrical and magnetic integrity of the sensor device. The entire development, from the demonstration of the world-wide first elastically stretchable magnetic sensor to the realization of a technology platform for robust, ready-to-use elastic magnetoelectronics with fully strain invariant properties, is described. The prepared soft giant magnetoresistive devices exhibit the same sensing performance as on conventional rigid supports, but can be stretched uniaxially or biaxially reaching strains of up to 270% and endure over 1,000 stretching cycles without fatigue. The comprehensive magnetoelectrical characterization upon tensile deformation is correlated with in-depth structural investigations of the sensor morphology transitions during stretching. With their unique mechanical properties, the elastic magnetoresistive sensor elements readily conform to ubiquitous objects of arbitrary shapes including the human skin. This feature leads electronic skin systems beyond imitating the characteristics of its natural archetype and extends their cognition to static and dynamic magnetic fields that by no means can be perceived by human beings naturally. Various application fields of stretchable magnetoelectronics are proposed and realized throughout this work. The developed sensor platform can equip soft electronic systems with navigation, orientation, motion tracking and touchless control capabilities. A variety of novel technologies, like smart textiles, soft robotics and actuators, active medical implants and soft consumer electronics will benefit from these new magnetic functionalities.
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3

Jeong, Seung Hee. "Soft Intelligence : Liquids Matter in Compliant Microsystems." Doctoral thesis, Uppsala universitet, Mikrosystemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-281281.

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Анотація:
Soft matter, here, liquids and polymers, have adaptability to a surrounding geometry. They intrinsically have advantageous characteristics from a mechanical perspective, such as flowing and wetting on surrounding surfaces, giving compliant, conformal and deformable behavior. From the behavior of soft matter for heterogeneous surfaces, compliant structures can be engineered as embedded liquid microstructures or patterned liquid microsystems for emerging compliant microsystems. Recently, skin electronics and soft robotics have been initiated as potential applications that can provide soft interfaces and interactions for a human-machine interface. To meet the design parameters, developing soft material engineering aimed at tuning material properties and smart processing techniques proper to them are to be highly encouraged. As promising candidates, Ga-based liquid alloys and silicone-based elastomers have been widely applied to proof-of-concept compliant structures. In this thesis, the liquid alloy was employed as a soft and stretchable electrical and thermal conductor (resistor), interconnect and filler in an elastomer structure. Printing-based liquid alloy patterning techniques have been developed with a batch-type, parallel processing scheme. As a simple solution, tape transfer masking was combined with a liquid alloy spraying technique, which provides robust processability. Silicone elastomers could be tunable for multi-functional building blocks by liquid or liquid-like soft solid inclusions. The liquid alloy and a polymer additive were introduced to the silicone elastomer by a simple mixing process. Heterogeneous material microstructures in elastomer networks successfully changed mechanical, thermal and surface properties. To realize a compliant microsystem, these ideas have in practice been useful in designing and fabricating soft and stretchable systems. Many different designs of the microsystems have been fabricated with the developed techniques and materials, and successfully evaluated under dynamic conditions. The compliant microsystems work as basic components to build up a whole system with soft materials and a processing technology for our emerging society.
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4

YANG, I.-CHEN, and 楊乙真. "Stretchable Electrodes and Strain Sensors Using Silver Nanowires Embedded in Polyurethane." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/ky44r9.

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Анотація:
碩士
國立臺南大學
材料科學系碩士班
106
Silver nanowire films are considered to be the next-generation transparent conductive electrodes because of their mesh structure, which makes it to obtain high transparence and conductivity. If the films are combined with a flexible substrate, they have the potential to be stretchable electrodes or simple strain sensors. This study explores the feasibility and characteristics of silver nanowires embedded in flexible polyurethane (PU) substrates to fabricate stretchable electrodes and sensors. The first part is the synthesis of silver nanowires. In this study, a two-step method combining a polyol reaction and a hydrothermal process was employed. Copper chloride dihydrate (CuCl2.2H2O) was used as seed precursor. We characterized the length, diameter and morphology of the silver nanowires under the parameters of different molecular weight of poly(vinylpyrrolidone), the injection rate of silver nitrate solution and the time of hydrothermal heating. Under appropriate conditions, we obtained silver nanowires with dimensions of 80 ~ 90 μm in length and 110 ~ 120 nm in diameter for subsequent electrode fabrication. Silver nanowire films were prepared by dropping the nanowire suspension onto the glass substrate, and then the PU solution was dropped on the films to fabricate nanowire-embedded composite films. After drying, the composite films were peeled off from the substrate, and the stretchable electrodes were obtained. We got composite films with a sheet resistance of 6.59 Ω/sq at a transmittance of near 80%. The stretchable electrodes characterized by tensile test of different elongation were performed for nanowire films after different heat treatments together with different amount of silver nanowires embedded. The PU film with higher amount of silver nanowires after heat treated at 250 °C had a smaller resistance change after stretching. It can be seen that the transferred PU films can reduce the damage probability of the silver nanowires, which may benefit the design and implementation of useful stretchable electrodes.
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5

Sung, Ting-Yu, and 宋庭宇. "Design of Flexible and Stretchable High Sensitive Strain Sensors using Carbon Nanotube Forests via Novel Transfer Technique." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41360732837475140675.

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Анотація:
碩士
國立臺灣大學
機械工程學研究所
101
In this study, we use the way of coating with thin iron film on silicon substrates to grow carbon nanotubes, and carbon nanotubes will only grow on substrates which have coated with thin iron film. Therefore, we first design the mask pattern with a spiral of different width and length, and use photolithography to produce silicon substrates of different spiral pattern. Then we coat with the iron film on silicon substrates and lift off. Finally, we can grow spiral carbon nanotube forests by chemical deposition method. By using the photolithography to grow carbon nanotubes, we can grow narrower width and longer length of carbon nanotube forests in smaller area and can improve the height consistency of the overall carbon nanotubes. We use PDMS as the material to transfer carbon nanotubes, and also use a new technique to transfer spiral carbon nanotubes. Because of the flexibility and high stretchability of PDMS, the composites of PDMS and carbon nanotubes can produce high stretchable and flexible strain sensors. The experimental results show that the strain of the designed sensors can up to 25% and the sensitivity of repeated stretching of our sensors are better than other sensors which is flexible and high stretchable in other literatures. On the other hand, the width and length of spiral carbon nanotubes will influence the sensitivity of the sensor. The wider the width of spiral, the better the sensitivity of sensor. Also, the cutting length of the composites of PDMS and carbon nanotubes must be greater than 13mm, and therefore the sensor sensitivity will be stabilized. In our strain sensors, the alignment direction of carbon nanotubes and the direction of strain axis are perpendicular so that the sensors have excellent repeatability. The linearity of strain and resistance change can be determined by R-square value. The R-square values of our sensors are close to 1, which represents the resistance change of sensor is nearly linear. When growing carbon nanotube forests coated with metal particles is transferred by PDMS, they can produce sensors with metal particles. The sensitivity of these kinds of sensors is better than the original sensors. Metal particles in sensors can effectively improve the sensor hysteresis and response time, but they will also reduce the maximum strain of sensors.
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6

Madhavan, R. "Inkjet-Printed Ag Nanomaterials based Strain Sensors for Wearable Sensing Applications." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5715.

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Анотація:
Of late, the demand of wearable sensors has exponentially risen. For example, strain sensors that can be worn and are skin mountable play a significant role in the areas of human motion detection, healthcare, soft robotics, electronic skin, and sport as well as fitness tracking. It is known that traditional strain sensing devices made of semiconductors and metals exhibit low sensitivities (GF< 2), low strain sensing range (< 5%) and exhibit rigidity which are undesirable characteristics for wearable sensing applications. In order to address these issues, metal nanomaterials such as AgNWs-AgNPs nanohybrids are now employed as active and functional sensing devices for the fabrication of wearable strain sensors. Further, inkjet printing process has been utilized for fabricating wearable devices (together with advantages of wide sensing range and high sensitivity) due to its cost effectiveness and capability of large scale production. The stretchable, wearable, and skin-mountable strain sensors have garnered significant research attention in consumer and medical products which may be attributable to various aspects like cost-effectiveness and ergonomics fuelled by the development in miniaturized electronics, growing consumer awareness for health related issues, and constant need for medical practitioners to obtain quality medical data from patients. Recently, the fabrication of strain sensors with high sensitivity and high stretchability, which can precisely monitor subtle strains and large mechanical deformations exhibited by the human bodily motions, is critical for healthcare, human-machine interfaces, and biomedical electronics. However, a significant challenge still exists i.e. achieving strain sensors with high sensitivity, high linearity, and high stretchability by a facile, low-cost and scalable fabrication technique. Herein, in this research, we achieve AgNWs-AgNPs/Ecoflex based composite strain sensors via inkjet printing technique which precisely deposits functional materials in a rapid, non-contact and maskless approach allowing high volume production. Noteworthily, the fabricated strain sensor display many fascinating features, including high sensitivity (a gauge factor of 96.26), high linearity, a broad strain sensing range greater than ~ 55%, excellent stability and reliability (>1000 cycles), and low monitoring limit (<1% strain). These remarkable features allow the strain sensor to effectively monitor various human motions. This work opens up a new path for fabricating elastomer based strain sensors for wearable electronics. Next, a simple, eco-friendly and scalable fabrication process is presented for manufacturing flexible epidermis-like sandwich structured (i.e.AgNWs-AgNPs conductive network embedded between two slabs of Dragon skin) strain sensors based on AgNWs-AgNPs conductive network incorporated in a Dragon skin elastomeric polymer substrate. The AgNWs-AgNPs conductive network-Dragon skin nanocomposite based strain sensors demonstrate superior sensitivity with a gauge factor of 5.6 at an applied strain range of 40%-60% and a broad sensing range of up to 80%, while exhibiting superior performance and durability for more than 500 stretch-release cycles. The applicability of our high performance strain sensors for the detection of face expressions and large-strain joint motions is demonstrated in this work. Next, we fabricate electronic device comprising of highly conductive AgNWs-AgNPs network embedded onto highly stretchable natural rubber supporting material. When mechanical strains are applied, the disconnection of adjacent AgNWs-AgNPs along with opening-closing of microcracks in a reversible manner results in the variation of electrical resistance of the sensor exhibiting high sensitivity with discernible gauge factors. The inkjet printed strain sensor exhibit ultrasensitivity with a gauge factor of 170.8 coupled with a wide and linear sensing range of over 120%. Moreover, the sensor exhibit fast responsiveness to applied strains, low hysteresis, and remarkable cyclability. We demonstrate that the skin-mounted strain sensor can be used for multiscale sensing to monitor electrical resistance signals ranging from small-scale human face expressions to large-strain human joint motions. Furthermore, functional resistive-type strain sensor based on inkjet printedAgNWs-AgNPs conductive network on stretchable nitrile elastomer supporting material has been fabricated. The novel strain sensor employed disconnection of AgNWs-AgNPs and expansion of porous structure to accommodate the applied mechanical strains. The as-fabricated strain sensor exhibited low contact resistance, high sensitivity (GF~751.07), broad strain sensing range (>60%), fast responsiveness and remarkable long-term durability. The brittle nature of nanowires endows the wearable strain sensor with remarkable sensitivity and the elastomeric supporting material enhances the deformation ability of the strain sensor. Moreover, various demonstrations have been carried out for the detection of small-scale mechanical strains such as expressions of the face and monitoring of large-scale deformations like human joint motions. This study presents a unique sensor which can be useful for multi-scale sensing. The key novelty and contribution of this work is the chemistry for silver nanomaterial deposition with inkjet printing and the systematic testing of dynamic sensing performance of strain sensors under different conditions has been conducted. For example, the critical sensing properties of the wearable strain sensors have been evaluated such as stretchability or strain sensing range, sensitivity, linearity, hysteresis performance, and reproducibility.
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7

"Gallium-Based Room Temperature Liquid Metals and its Application to Single Channel Two-Liquid Hyperelastic Capacitive Strain Sensors." Master's thesis, 2015. http://hdl.handle.net/2286/R.I.29675.

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abstract: Gallium-based liquid metals are of interest for a variety of applications including flexible electronics, soft robotics, and biomedical devices. Still, nano- to microscale device fabrication with these materials is challenging because of their strong adhesion to a majority of substrates. This unusual high adhesion is attributed to the formation of a thin oxide shell; however, its role in the adhesion process has not yet been established. In the first part of the thesis, we described a multiscale study aiming at understanding the fundamental mechanisms governing wetting and adhesion of gallium-based liquid metals. In particular, macroscale dynamic contact angle measurements were coupled with Scanning Electron Microscope (SEM) imaging to relate macroscopic drop adhesion to morphology of the liquid metal-surface interface. In addition, room temperature liquid-metal microfluidic devices are also attractive systems for hyperelastic strain sensing. Currently two types of liquid metal-based strain sensors exist for inplane measurements: single-microchannel resistive and two-microchannel capacitive devices. However, with a winding serpentine channel geometry, these sensors typically have a footprint of about a square centimeter, limiting the number of sensors that can be embedded into. In the second part of the thesis, firstly, simulations and an experimental setup consisting of two GaInSn filled tubes submerged within a dielectric liquid bath are used to quantify the effects of the cylindrical electrode geometry including diameter, spacing, and meniscus shape as well as dielectric constant of the insulating liquid and the presence of tubing on the overall system's capacitance. Furthermore, a procedure for fabricating the two-liquid capacitor within a single straight polydiemethylsiloxane channel is developed. Lastly, capacitance and response of this compact device to strain and operational issues arising from complex hydrodynamics near liquid-liquid and liquid-elastomer interfaces are described.
Dissertation/Thesis
Masters Thesis Materials Science and Engineering 2015
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Частини книг з теми "Stretchable strain sensors"

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Tee, Benjamin C. K., Stefan C. B. Mannsfeld, and Zhenan Bao. "Elastomer-Based Pressure and Strain Sensors." In Stretchable Electronics, 325–53. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527646982.ch14.

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Otaka, Hideo. "Dielectric Elastomer Sensors: Development of a Stretchable Strain Sensor System." In Soft Actuators, 661–75. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6850-9_37.

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Jia, Li, and Hongliang Ren. "Stretchable Strain Sensors by Kirigami Deployable on Balloons with Temporary Tattoo Paper." In Lecture Notes in Bioengineering, 503–25. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5932-5_19.

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Yao, Shurong, Xu Nie, Xun Yu, Bo Song, and Jill Blecke. "Highly Stretchable Miniature Strain Sensor for Large Strain Measurement." In Dynamic Behavior of Materials, Volume 1, 239–43. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-22452-7_33.

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Han, Fei, Jinhui Li, Yuan Zhang, Guoping Zhang, Rong Sun, and Chingping Wong. "A Stretchable and Flexible Strain Sensor Based on Graphene Sponge." In Advanced Functional Materials, 379–87. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0110-0_43.

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Zhang, Zhilin, Hude Ma, Lina Wang, Xinyi Guo, Ruiqing Yang, Shuai Chen, and Baoyang Lu. "Stretchable, Conducting and Large-Range Monitoring PEDOT: PSS-PVA Hydrogel Strain Sensor." In Intelligent Robotics and Applications, 305–14. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13822-5_27.

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Nithin, K. S., K. R. Prakash, V. Ravi Kumar, M. V. S. Deepak, B. J. Kishen Karumbaiah, S. Sachhidananda, K. N. Shilpa, B. M. Jagajeevan Raj, and H. Siddaramaiah. "Polymer-based electro-active smart composites as stretchable strain sensors." In Polymer-Based Advanced Functional Composites for Optoelectronic and Energy Applications, 291–320. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-818484-4.00014-8.

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Тези доповідей конференцій з теми "Stretchable strain sensors"

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Putzu, Fabrizio, Kaspar Althoefer, and Luigi Manfredi. "Silicone-based ultra-stretchable strain sensors." In UK-RAS Conference: Robots Working For and Among Us. EPSRC UK-RAS Network, 2018. http://dx.doi.org/10.31256/ukras17.46.

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Dang, Wenting, Ensieh S. Hosseini, and Ravinder Dahiya. "Soft Robotic Finger with Integrated Stretchable Strain Sensor." In 2018 IEEE Sensors. IEEE, 2018. http://dx.doi.org/10.1109/icsens.2018.8589671.

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Shi, Hongyang, Xinda Qi, Yunqi Cao, Nelson Sepúlveda, Chuan Wang, and Xiaobo Tan. "Highly Stretchable Resistive Strain Sensors Using Multiple Viscous Conductive Materials." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2321.

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Abstract This paper proposes a highly stretchable strain sensor using viscous conductive materials as resistive element and introduces a simple and economic fabrication process by encapsulating the conductive materials between two layers of silicone rubbers Ecoflex 00-30. The fabrication process of the strain sensor is presented, and the properties of the viscous conductive materials are studied. Characterization shows that the sensor with conductive gels, toothpastes, carbon paint, and carbon grease can sustain a maximum tensile strain of 200% and retain good repeatability, with a strain gauge factor of 2.0, 1.75, 3.0, and 7.5, respectively. Furthermore, strain sensors with graphite and carbon nanotubes mixed with conductive gels are fabricated to explore how to improve the gauge factor. With a focus on the most promising material, conductive carbon grease, cyclic stretching tests are conducted and show good repeatability at 100% strain for 100 cycles. Lastly, it is demonstrated that the stretchable strain sensor made of carbon grease is capable of measuring finger bending. With its easy and low-cost fabrication process, large strain detection range and good gauge factor, the conductive materials-based strain sensors are promising for future biomedical, wearable electronics and rehabilitation applications.
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Liu, Shiqiang, Yuzhong Zhang, and Rong Zhu. "Multifunctional stretchable sensor for detecting flow, strain and temperature." In 2021 IEEE Sensors. IEEE, 2021. http://dx.doi.org/10.1109/sensors47087.2021.9639652.

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Dahiya, Abhishek Singh, Thierry Gil, Nadine Azemard, Jerome Thireau, Alain Lacampagne, Aida Todri-Sanial, and Benoit Charlot. "Stretchable Strain Sensors for Human Movement Monitoring." In 2020 Symposium on Design, Test, Integration & Packaging of MEMS and MOEMS (DTIP). IEEE, 2020. http://dx.doi.org/10.1109/dtip51112.2020.9139154.

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Moorthy, Visva, Panagiotis Kassanos, Etienne Burdet, and Eric Yeatman. "Stencil Printing of Low-Cost Carbon-Based Stretchable Strain Sensors." In 2022 IEEE Sensors. IEEE, 2022. http://dx.doi.org/10.1109/sensors52175.2022.9967200.

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Al-Rubaiai, Mohammed, Ryohei Tsuruta, Umesh Gandhi, Chuan Wang, and Xiaobo Tan. "3D-Printed Stretchable Strain Sensor With Application to Wind Sensing." In ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-7945.

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Stretchable strain sensors with large strain range, high sensitivity, and excellent reliability are of great interest for applications in soft robotics, wearable devices, and structure-monitoring systems. Unlike conventional template lithography-based approaches, 3D-printing can be used to fabricate complex devices in a simple and cost-effective manner. In this paper, we report 3D-printed stretchable strain sensors that embeds a flexible conductive composite material in a hyper-plastic substrate. Three commercially available conductive filaments are explored, among which the conductive thermoplastic polyurethane (ETPU) shows the highest sensitivity (gauge factor of 5), with a working strain range of 0%–20%. The ETPU strain sensor exhibits an interesting behavior where the conductivity increases with the strain. In addition, an experiment for measuring the wind speed is conducted inside a wind tunnel, where the ETPU sensor shows sensitivity to the wind speed beyond 5.6 m/s.
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Kim, Woo Soo. "Stretchable RF antenna sensors for conformal strain detection." In 2015 USNC-URSI Radio Science Meeting (Joint with AP-S Symposium). IEEE, 2015. http://dx.doi.org/10.1109/usnc-ursi.2015.7303624.

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Sondhi, Kartik, Jacob Amontree, Seahee Hwangbo, Sai Guruva Reddy Avuthu, Yong-Kyu Yoon, Z. Hugh Fan, and Toshikazu Nishida. "Airbrushed Dipole RF Strain Sensor Antenna on a Stretchable Polyurethane Substrate." In 2018 IEEE Sensors. IEEE, 2018. http://dx.doi.org/10.1109/icsens.2018.8589617.

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Li, Kebin, Karine Turcotte, and Teodor Veres. "Stretchable Strain Sensors based on Thermoplastic Elastomer Microfluidics Embedded with Liquid Metal." In 2019 IEEE SENSORS. IEEE, 2019. http://dx.doi.org/10.1109/sensors43011.2019.8956780.

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