Vertical CNT–Ecoflex nanofins for highly linear broad-range-detection wearable strain sensors

Zhang, Shuo; Wen, Lei; Wang, Huan; Zhu, Kai; Zhang, Min

doi:10.1039/c7tc05571d

Cited by 72 publications

(51 citation statements)

References 40 publications

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“…[230,232] Zhang et al have reported that sandwiching CNTs-Ecoflex nanocomposite strain sensors between two layers of Ecoflex can greatly enhance their endurance to humidity variations. [233] Second, conformal adhesion of wearable strain sensors onto the soft skin is another important consideration for noise-free and accurate strain monitoring. [190] The weak interfacial adhesion between wearable sensors and skin leads to their sliding and delamination from the skin.…”

Section: Limitations and Challengesmentioning

confidence: 99%

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

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

410

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: Limitations and Challengesmentioning

confidence: 99%

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

Souri¹,

Banerjee

Jusufi

et al. 2020

Advanced Intelligent Systems

410

289

View full text Add to dashboard Cite

show abstract

“…The closest any material comes to the desired benchmark values for the optimum material is again a highly aligned/orientated CNT composite with G = 4, W = 2.5, Y = 125 kPa. [74]…”

Section: Gauge Factor Vs Young's Modulus and The Lay Of The Landmentioning

confidence: 99%

Stumbling through the Research Wilderness, Standard Methods To Shine Light on Electrically Conductive Nanocomposites for Future Healthcare Monitoring

Boland

2019

ACS Nano

144

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Electrically conductive nanocomposites are an exciting ever-expanding area of research that has yielded many new technologies for wearable health devices. Acting as strain sensing materials, they have paved the way towards real-time medical diagnostic tools that may very well lead to a golden age of healthcare. Currently, the goal in research is to create a material that simultaneously has both a large gauge factor (G) and sensing range. However, a weakness in the area of electromechanical research is the lack of standardisation in the reporting of the figure of merit (i.e. G) and the need for new metrics to give researchers a more complete view of the research landscape of resistive-type sensors. A paradigm shift in the way in which data is reported is required, to push research in the right direction and to facilitate achieving research goals. Here, we report a standardised method for reporting strainsensing performance and the introduction of the working factor (W) and the Young's modulus (Y) of a material as two new material criteria. Using this new method, we can now for the first time define the benchmarks for an optimum sensing material (G > 7, W > 1, Y < 300 kPa) using limits set by standard commercial materials and the human body. Using extrapolated data from 200 publications normalised to this standard method, we can review what composite-types meet these benchmark limits, what governs composite performances, the literary trends in composites and individual nanomaterial performance and the future prospects of research.

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“…CNTs have been broadly studied for wearable strain sensing. [106][107][108] For example, a millimeter-long multiwalled CNT film, prepared by stacking CNT webs drawn from a CNT array, was utilized for motion detection. [106] The unidirectionally aligned CNT layer provided high stretchability and large gauge factor.…”

Section: Physical Sensingmentioning

confidence: 99%

Flexible Hybrid Sensors for Health Monitoring: Materials and Mechanisms to Render Wearability

et al. 2019

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201902133.Wearable electronics have revolutionized the way physiological parameters are sensed, detected, and monitored. In recent years, advances in flexible and stretchable hybrid electronics have created emergent properties that enhance the compliance of devices to our skin. With their unobtrusive attributes, skin conformable sensors enable applications toward real-time disease diagnosis and continuous healthcare monitoring. Herein, critical perspectives of flexible hybrid electronics toward the future of digital health monitoring are provided, emphasizing its role in physiological sensing. In particular, the strategies within the sensor composition to render flexibility and stretchability while maintaining excellent sensing performance are considered. Next, novel approaches to the functionalization of the sensor for physical or biochemical stimuli are extensively covered. Subsequently, wearable sensors measuring physical parameters such as strain, pressure, temperature, as well as biological changes in metabolites and electrolytes are reported. Finally, their implications toward early disease detection and monitoring are discussed, concluding with a future perspective into the challenges and opportunities in emerging wearable sensor designs for the next few years. Wearable SensorsRecent progress in flexible and stretchable electronic systems has ignited exciting applications in consumer electronics, human computer interactions, augmented reality devices, and electronic skins. [1][2][3] Among these, a significant interest lies in health monitoring, [4][5][6] where vital functions may be measured continuously. Continuous health monitoring is far more superior than conventional healthcare workflow as the conventional approach can only offer snapshots of the physiological condition Figure 3. Material substrates for flexible and stretchable electronics, highlighting the advantages of choices for each material type. a) Common polymeric materials by order of glass transition temperatures. Reproduced with permission. [29] Copyright 2015, Elsevier. b) Schematic representation of crosslinked elastomeric substrates possessing configuration entropy. Reproduced with permission. [22]

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Vertical CNT–Ecoflex nanofins for highly linear broad-range-detection wearable strain sensors

Abstract: A nanofin-based strain sensor, fabricated by transferring vertical CNTs to an Ecoflex substrate, has the advantages of high linearity and sensitivity and can detect both large and subtle motions.

Cited by 72 publications

References 40 publications

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

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

Stumbling through the Research Wilderness, Standard Methods To Shine Light on Electrically Conductive Nanocomposites for Future Healthcare Monitoring

Flexible Hybrid Sensors for Health Monitoring: Materials and Mechanisms to Render Wearability

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