Highly Sensitive and Stretchable Multidimensional Strain Sensor with Prestrained Anisotropic Metal Nanowire Percolation Networks

Kim, Kyun Kyu; Hong, Sukjoon; Cho, Hyun Min; Lee, Sung Yong; Suh, Yong-Suk; Ham, Jooyeun; Ko, Seung Hwan

doi:10.1021/acs.nanolett.5b01505

Cited by 572 publications

(441 citation statements)

References 37 publications

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“…In recent years, several studies have reported highly flexible and stretchable micro- and nanostructured pressure and strain sensors based on polymers embedded with electrically active materials such as silver or gold nanowires (AgNW or AuNW) 6,7,11,12 , carbon nanotubes 9,13–21 (CNT), graphene 22–26 , graphite 24–26 , and other materials including inherently conducting polymers 1,3–5,10,27–34 . Achieving large stretchability (ɛ > 50%) and a high sensitivity (GF > 100) with a wide detection range have been the key factors in the development of strain sensors.…”

Section: Introductionmentioning

confidence: 99%

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

Tolvanen

Hannu

Jantunen

2018

Sci Rep

119

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Stretchable and wearable strain sensors have been intensively studied in recent years for applications in human motion monitoring. However, achieving a high-performance strain sensor with high stretchability, ultra-sensitivity, and functionality, such as tunable sensing ranges and sensitivity to various stimuli, has not yet been reported, even though such sensors have great importance for the future applications of wearable electronics. Herein, a novel and versatile strain sensor based on a cracking (silver ink patterned silicone elastomer)-(silver plated nylon structure) (Ag-DS/CF) has been designed and fabricated. The unique structure combined precisely shaped stretchable conductive fabrics and wrinkled Ag-ink pattern to achieve an excellent electrical performance. The Ag-DS/CF could be used to detect both large and subtle human motions and activities, pressure changes, and physical vibrations by achieving high stretchability up to 75%, ultrahigh sensitivity (gauge factor >104–106), tunable sensing ranges (from 7 to 75%). Excellent durability was demonstrated for human motion monitoring with machine washability. The extremely versatile Ag-DS/CF showed outstanding potential for the future of wearable electronics in real-time monitoring of human health, sports performance, etc.

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Section: Introductionmentioning

confidence: 99%

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

Tolvanen

Hannu

Jantunen

2018

Sci Rep

119

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“…. As an alternative material, silver nanowires (AgNWs) have been of great interest [25][26][27][28][29][30][31][32][33][34][35][36][37][38] due to the ability to form highly conductive percolative networks. [38][39][40][41] AgNW based sensing composite materials, formed exclusively by layer deposition, consist of a percolative network of the nanowires adhered to a flexible polymer substrate.…”

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confidence: 99%

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

et al. 2017

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Abstract:Integrated sensors for bodily measurements require a sensing material that are highly conductive, flexible, thin and sensitive. It is important that these materials be non-invasive in application but robust in nature to allow for effective, continuous measurement. Herein, we report a comparative study of two simple, scalable methods to produce silver nanowire (AgNW) polyurethane (PU) composite materials: layer-by-layer (LBL) and mixed filtration.Both types of composites formed were ultrathin (~50 µm) and highly conductive (10 4 S/m), with the LBL method ultimately found to be superior due to its low percolation threshold.Electrical resistance of the LBL composites was found to vary with strain, making these materials suitable for strain sensing. LBL composites displayed a working strain up to ~250% and a high gauge factor (G), with values of G~70 reported. The sensors reported here were ~10 9 -times more conductive and ~10 4 -times thinner than their carbon-based composite sensor counterparts with similar gauge factor. This made the strain sensors presented here among one of the most flexible, highly sensitive, thinnest, conductive materials in literature.We demonstrated that with these properties, the LBL composites formed were ideal for bodily motion detection. Introduction:

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“…Recently, flexible sensors have attracted increasing attention due to their great potential applications in wearable electronics and intelligent systems [1][2][3][4][5][6][7][8][9][10]. Particularly, flexible sensors can be mounted on human body or clothing for continuously monitoring subtle and large human motions [11][12][13][14] and physiological information, such as phonation [15], pulse [16][17][18], electrocardiogram (ECG) [19][20][21], respiration [22,23], skin temperature [24,25], and so on. Towards these applications, wearable sensors should have some basic characteristics, such as high sensitivity, good flexibility, desirable stretchability, biocompatibility and good stability.…”

Section: Introductionmentioning

confidence: 99%

Advanced carbon materials for flexible and wearable sensors

et al. 2017

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Flexible and wearable sensors have drawn extensive concern due to their wide potential applications in wearable electronics and intelligent robots. Flexible sensors with high sensitivity, good flexibility, and excellent stability are highly desirable for monitoring human biomedical signals, movements and the environment. The active materials and the device structures are the keys to achieve high performance. Carbon nanomaterials, including carbon nanotubes (CNTs), graphene, carbon black and carbon nanofibers, are one of the most commonly used active materials for the fabrication of high-performance flexible sensors due to their superior properties. Especially, CNTs and graphene can be assembled into various multi-scaled macroscopic structures, including one dimensional fibers, two dimensional films and three dimensional architectures, endowing the facile design of flexible sensors for wide practical applications. In addition, the hybrid structured carbon materials derived from natural bio-materials also showed a bright prospect for applications in flexible sensors. This review provides a comprehensive presentation of flexible and wearable sensors based on the above various carbon materials. Following a brief introduction of flexible sensors and carbon materials, the fundamentals of typical flexible sensors, such as strain sensors, pressure sensors, temperature sensors and humidity sensors, are presented. Then, the latest progress of flexible sensors based on carbon materials, including the fabrication processes, performance and applications, are summarized. Finally, the remaining major challenges of carbon-based flexible electronics are discussed and the future research directions are proposed. [56,57], have been used as the active components for the fabrication of flexible sensors. Among these materials, metal NPs can be used to fabricate flexible sensors with high sensitivity, but the sensing range and stretchability of these sensors are limited [58]. Besides, due to the limited chemical stability and reproducibility of metal nanowires, it is challenging to fabricate stable sensors using metal nanowires [10]. Similarly, conductive polymers with poor stability and conductivity are also difficult to be used for the fabrication of high-performance sensors [59]. In contrast, carbon materials are one of the most commonly investigated materials, especially CNTs and graphene (including graphene oxide (GO) and reduced graphene oxide (rGO)), due to their remarkable mechanical, electrical and thermal properties. To implement macroscopic applications, CNTs and graphene with superior properties in microscopic level should be converted into macroscopic functional assemblies, such as one dimensional (1D) fibers or yarns [60,61], two dimensional (2D) films or sheets [62,63], three dimensional (3D) architectures [64][65][66] (Fig. 1). The multi-scaled macroscopic carbon nanomaterials endow the flexible sensors with high sensitivity, excellent flexibility and good stability as well as desired configurations. Also, lo...

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Highly Sensitive and Stretchable Multidimensional Strain Sensor with Prestrained Anisotropic Metal Nanowire Percolation Networks

Cited by 572 publications

References 37 publications

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

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

Surface coatings of silver nanowires lead to effective, high conductivity, high-strain, ultrathin sensors

Advanced carbon materials for flexible and wearable sensors

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