Stretchable and Washable Strain Sensor Based on Cracking Structure for Human Motion Monitoring

Tolvanen, Jarkko; Hannu, Jari; Jantunen, Heli

doi:10.1038/s41598-018-31628-7

Cited by 118 publications

(93 citation statements)

References 53 publications

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“…Although cracks are undesirable for structural designs, the generation of microcracks in conductive thin films has been successfully utilized to develop highly sensitive strain sensors. The opening and enlargement of microcracks have been observed in CNT-based strain sensors, [109,138,173,174] graphene-based strain sensors and its derivatives, [6,57,117] metal NW-and NPs [86,116,[175][176][177][178][179][180] based strain sensors. The rapid separation of nanomaterials at the microcrack edges dramatically limits the electrical conduction paths within the thin films, leading to a significant increase in the electrical resistance of strain sensors under the applied tensile strain.…”

Section: Crack Generation In Conductive Filmsmentioning

confidence: 99%

“…To monitor the low strains, highly sensitive sensors are needed to give high resolution and accurate signal variations in response to tiny deformations. [178] Figure 9a shows a stretchable strain sensor attached to the radial artery of the wrist for pulse rate monitoring. [56] The resistance of the sensor increased in each cardiac cycle due to the minute strains induced by the blood flow pressure.…”

Section: Healthcare and Biomedical Engineeringmentioning

confidence: 99%

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Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

446

289

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Recent advances in the design and implementation of wearable resistive, capacitive, and optical strain sensors are summarized herein. Wearable and stretchable strain sensors have received extensive research interest due to their applications in personalized healthcare, human motion detection, human–machine interfaces, soft robotics, and beyond. The disconnection of overlapped nanomaterials, reversible opening/closing of microcracks in sensing films, and alteration of the tunneling resistance have been successfully adopted to develop high‐performance resistive‐type sensors. On the other hand, the sensing behavior of capacitive‐type and optical strain sensors is largely governed by their geometrical changes under stretching/releasing cycles. The sensor design parameters, including stretchability, sensitivity, linearity, hysteresis, and dynamic durability, are comprehensively discussed. Finally, the promising applications of wearable strain sensors are highlighted in detail. Although considerable progress has been made so far, wearable strain sensors are still in their prototype stage, and several challenges in the manufacturing of integrated and multifunctional strain sensors should be yet tackled.

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Section: Crack Generation In Conductive Filmsmentioning

confidence: 99%

Section: Healthcare and Biomedical Engineeringmentioning

confidence: 99%

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

446

289

View full text Add to dashboard Cite

show abstract

“…39,40 All mechanical deformations change the outputs of the tactile sensor similarly due to the Poisson effect leading to poor decoupling of the inputs. 3,7,31,39 In this case, knowing the nature of the stimuli from the output can only be based on comparison and analysis of multiple time-dependent signal patterns to distinguish the different inputs. 6,39 This leads to poor discrimination and the need for complex data processing due to signal interference.…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, hybrid approaches with ingenious designs have recently been proposed for sensors and have shown interesting properties in respect to many of their ordinary counterparts. 3,45,46 Herein, we demonstrate a new type of stretchable and highly sensitive sensor exhibiting insensitivity to the strains induced by stretching and bending. The device is capable of providing resistivity switching under compressive stress corresponding to a pressure sensitivity up to 60.8 kPa −1 with a wide dynamic range (up to ∼50 kPa).…”

Section: ■ Introductionmentioning

confidence: 99%

Stretchable Sensors with Tunability and Single Stimuli-Responsiveness through Resistivity Switching Under Compressive Stress

Tolvanen

Kilpijärvi

Pitkänen

et al. 2020

ACS Appl. Mater. Interfaces

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The fascinating human somatosensory system with its complex structure is composed of numerous sensory receptors possessing distinct responsiveness to stimuli. It is a continuous source of inspiration for tactile sensors that mimic its functions. However, to achieve single stimulus-responsiveness with mechanical decoupling is particularly challenging in the light of structural design and has not been fully addressed to date. Here we propose a novel structural design inspired by combining the characteristics of electronic skin (e-skin) and electronic textile (e-textile) into a hybrid interface to achieve a stretchable single stimuli-responsive tactile sensor. The stencil printable biocarbon composite/silver-plated nylon hybrid interface possesses an extraordinary resistance switching (ΔR/R 0 up to ∼10 4 ) under compressive stress which is controllable by the composite film-thickness. It achieves a very high normal pressure sensitivity (up to 60.8 kPa −1 ) in a wide dynamic range (up to ∼50 kPa) in the piezoresistive operation mode and can effectively decouple stresses induced by stretching or bending. In addition, the device is capable of high accuracy strain sensing in its capacitive operation mode through dimensional change dominant response. Because of these intriguing features, it has potential for the next-generation Internet of Things devices and user-interactive systems capable of providing visual feedback and more advanced robotics or even prosthetics.

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“…For example, Tolvanen et al [13] discussed a stretchable and washable strain sensor based on a cracking structure for human motion monitoring. Zheng et al [14] presented a highly stretchable and stable strain sensor from hybrid conductive composites (carbon nanofillers/polydimethylsiloxane) for large movements.…”

Section: Introductionmentioning

confidence: 99%

Highly Sensitive E-Textile Strain Sensors Enhanced by Geometrical Treatment for Human Monitoring

Vu¹,

Kim²

2020

Sensors

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Electronic textiles, also known as smart textiles or smart fabrics, are one of the best form factors that enable electronics to be embedded in them, presenting physical flexibility and sizes that cannot be achieved with other existing electronic manufacturing techniques. As part of smart textiles, e-sensors for human movement monitoring have attracted tremendous interest from researchers in recent years. Although there have been outstanding developments, smart e-textile sensors still present significant challenges in sensitivity, accuracy, durability, and manufacturing efficiency. This study proposes a two-step approach (from structure layers and shape) to actively enhance the performance of e-textile strain sensors and improve manufacturing ability for the industry. Indeed, the fabricated strain sensors based on the silver paste/single-walled carbon nanotube (SWCNT) layers and buffer cutting lines have fast response time, low hysteresis, and are six times more sensitive than SWCNT sensors alone. The e-textile sensors are integrated on a glove for monitoring the angle of finger motions. Interestingly, by attaching the sensor to the skin of the neck, the pharynx motions when speaking, coughing, and swallowing exhibited obvious and consistent signals. This research highlights the effect of the shapes and structures of e-textile strain sensors in the operation of a wearable e-textile system. This work also is intended as a starting point that will shape the standardization of strain fabric sensors in different applications.

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Stretchable and Washable Strain Sensor Based on Cracking Structure for Human Motion Monitoring

Cited by 118 publications

References 53 publications

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Wearable and Stretchable Strain Sensors: Materials, Sensing Mechanisms, and Applications

Stretchable Sensors with Tunability and Single Stimuli-Responsiveness through Resistivity Switching Under Compressive Stress

Highly Sensitive E-Textile Strain Sensors Enhanced by Geometrical Treatment for Human Monitoring

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