Nanocrack-based strain sensors

Zhang, Chi; Sun, Jining; Lu, Yao; Liu, Junshan

doi:10.1039/d0tc04346j

Cited by 61 publications

(53 citation statements)

References 125 publications

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“…The disconnection–reconnection process of the nanoscale cracks under minute deformation induces a huge change in the electrical resistance of metal films, leading to an ultrahigh mechanosensitivity with a gauge factor (GF ∼ 2000) in the 0–2% strain range. Following the pioneering work, much effort has been devoted to adjusting the micro/nanocrack patterns (channel cracks and network cracks) and crack characteristics (crack density, crack depth, crack asperity) for optimizing the sensing performance of metal film-based SSSs via tailoring film thickness, interfacial adhesion, stress-concentrating flaws in polymer substrates, and special structures, etc. − Generally, channel cracks enable the SSSs to exhibit a higher sensitivity, while network cracks endow the SSSs with a larger stretchability (broader sensing range). Unfortunately, the increase in sensitivity is usually sacrificed by the reduction in stretchability, which reflects the sensitivity-stretchability trade-off in the field of SSSs. − This inherently hinders the practical applications of metal film-based SSSs.…”

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confidence: 99%

Topological Gradients for Metal Film-Based Strain Sensors

Zhu

Xia

et al. 2022

Nano Lett.

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Metal film-based stretchable strain sensors hold great promise for applications in various domains, which require superior sensitivity-stretchability-cyclic stability synergy. However, the sensitivitystretchability trade-off has been a long-standing dilemma and the metal filmbased strain sensors usually suffer from weak cyclic durability, both of which significantly limit their practical applications. Here, we propose an extremely facile, low-cost and spontaneous strategy that incorporates topological gradients in metal film-based strain sensors, composed of intrinsic (grain size and interface) and extrinsic (film thickness and wrinkle) microstructures. The topological gradient strain sensor exhibits an ultrawide stretchability of 100% while simultaneously maintaining a high sensitivity at an optimal topological gradient of 4.5, due to the topological gradientsinduced multistage film cracking. Additionally, it possesses a decent cyclic stability for >10 000 cycles between 0 and 40% strain enabled by the gradient-mixed metal/elastomer interfaces. It can monitor the full-range human activities from subtle pulse signals to vigorous joint movements.

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confidence: 99%

Topological Gradients for Metal Film-Based Strain Sensors

Zhu

Xia

et al. 2022

Nano Lett.

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“…After further compression, the contact mode of the adjacent skeletons inside the NRLF/PDA/AgNP changes from point contact to surface contact. Under larger deformation, surface contact becomes the main contact method. , All of the adjacent skeletons inside the sensor are in contact with each other, which means that the conductive network structure is stable, and there is no obvious change in resistance, so the decreasing rate of resistance is reduced.…”

Section: Resultsmentioning

confidence: 99%

3D Nanoconductive Network Based on the Microstructure of Latex Foam for Superior Performance Piezoresistive Sensors

Zhang

Lin

Zhang

et al. 2021

ACS Appl. Polym. Mater.

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With increasing demand for diversification, miniaturization, and intellectualization of flexible electronic devices, an increasing number of nanomaterials with excellent performance characteristics have been developed. As a result, conductive polymer composites (CPCs), composed of conductive components and insulating polymer matrices, have shown significant potential for use in intelligent sensors. For three-dimensional (3D) piezoresistive sensors with foam structures, the distribution and state changes of the cracks inside the sensors play important roles in their resistance change and sensing ability. In this study, we decorated natural rubber latex foam (NRLF) with polydopamine (PDA) and modified silver nanoparticles (AgNPs) on the NRLF/PDA by in situ reduction to form a three-dimensional conductive network of AgNPs based on a foam structure. The sensing performance of NRLF/PDA/AgNP piezoresistive sensors was investigated, and it was found that the piezoresistive sensor prepared at a low AgNO3 concentration (5 wt %) exhibited stable resistance change rates at different compression strains. It exhibited a stable trend at different compression rates. The gauge factor (GF) was 81 (working strain: 0–36%). In terms of its good piezoresistive sensing ability, the piezoresistive sensor can accurately monitor human movements such as finger pressing, walking, and jumping.

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“…The cracked sensor-integrated silicone cantilever demonstrates a high sensitivity with a gauge factor of ~100 at a strain of 0.16% and long-term stability for continuous contractility measurement. Ultrasensitive strain sensors with precisely defined nanotrack patterns have been recently proposed to further improve the sensing performance in terms of repeatability and sensitivity 127 , 128 . To mimic the anisotropic structures of the native myocardium, different techniques have been utilized to create confluent, uniformly aligned cardiomyocyte monolayers.…”

Section: Platforms For In Vitro Contraction Measurementmentioning

confidence: 99%

Microengineered platforms for characterizing the contractile function of in vitro cardiac models

et al. 2022

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Emerging heart-on-a-chip platforms are promising approaches to establish cardiac cell/tissue models in vitro for research on cardiac physiology, disease modeling and drug cardiotoxicity as well as for therapeutic discovery. Challenges still exist in obtaining the complete capability of in situ sensing to fully evaluate the complex functional properties of cardiac cell/tissue models. Changes to contractile strength (contractility) and beating regularity (rhythm) are particularly important to generate accurate, predictive models. Developing new platforms and technologies to assess the contractile functions of in vitro cardiac models is essential to provide information on cell/tissue physiologies, drug-induced inotropic responses, and the mechanisms of cardiac diseases. In this review, we discuss recent advances in biosensing platforms for the measurement of contractile functions of in vitro cardiac models, including single cardiomyocytes, 2D monolayers of cardiomyocytes, and 3D cardiac tissues. The characteristics and performance of current platforms are reviewed in terms of sensing principles, measured parameters, performance, cell sources, cell/tissue model configurations, advantages, and limitations. In addition, we highlight applications of these platforms and relevant discoveries in fundamental investigations, drug testing, and disease modeling. Furthermore, challenges and future outlooks of heart-on-a-chip platforms for in vitro measurement of cardiac functional properties are discussed.

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Nanocrack-based strain sensors

Abstract: Cracks are always associated with defects or damages. However, recently cracks are attracting great research interests in many fields. One of the most successful applications of cracks is nanocrack-based strain...

Cited by 61 publications

References 125 publications

Topological Gradients for Metal Film-Based Strain Sensors

Topological Gradients for Metal Film-Based Strain Sensors

3D Nanoconductive Network Based on the Microstructure of Latex Foam for Superior Performance Piezoresistive Sensors

Microengineered platforms for characterizing the contractile function of in vitro cardiac models

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