Double‐Twisted Conductive Smart Threads Comprising a Homogeneously and a Gradient‐Coated Thread for Multidimensional Flexible Pressure‐Sensing Devices

Tai, Yanlong; Lubineau, Gilles

doi:10.1002/adfm.201600078

Cited by 67 publications

(58 citation statements)

References 45 publications

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“…Among many different types of sensor devices, strain/motion [20, and touch/pressure sensors have been of great interest. [68,[112][113][114][115][116][117][118][119][120][121][122][123][124][125] In order to realize these various types of sensors in textile platform, electrically conducting fibers are typically necessary in order to detect or sense the changes of strain, touch, and pressure and convert them into electrical signals. Since the most of the common fibers are insulators, electrically conducting components must be coated or embedded in the fibers.…”

Section: Methodsmentioning

confidence: 99%

Section: Textile‐based Wearable Sensors and Systemsmentioning

confidence: 99%

Section: Conclusion and Prospectsmentioning

confidence: 99%

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Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Heo

Eom

Kim

et al. 2017

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Wearable electronics are emerging as a platform for next-generation, human-friendly, electronic devices. A new class of devices with various functionality and amenability for the human body is essential. These new conceptual devices are likely to be a set of various functional devices such as displays, sensors, batteries, etc., which have quite different working conditions, on or in the human body. In these aspects, electronic textiles seem to be a highly suitable possibility, due to the unique characteristics of textiles such as being light weight and flexible and their inherent warmth and the property to conform. Therefore, e-textiles have evolved into fiber-based electronic apparel or body attachable types in order to foster significant industrialization of the key components with adaptable formats. Although the advances are noteworthy, their electrical performance and device features are still unsatisfactory for consumer level e-textile systems. To solve these issues, innovative structural and material designs, and novel processing technologies have been introduced into e-textile systems. Recently reported and significantly developed functional materials and devices are summarized, including their enhanced optoelectrical and mechanical properties. Furthermore, the remaining challenges are discussed, and effective strategies to facilitate the full realization of e-textile systems are suggested.

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Section: Methodsmentioning

confidence: 99%

Section: Textile‐based Wearable Sensors and Systemsmentioning

confidence: 99%

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Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Heo

Eom

Kim

et al. 2017

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“…Tai et al [195] utilized SWNTs and cotton threads to fabricate pressure sensors, which could accurately measure the value and location of pressure due to the graded thicknesses of SWNTs. Besides, Qi et al [196] used cellulose fibers coated with CNTs for sensing moisture.…”

Section: Flexible Fibers Containing Carbon Materials For Flexible Senmentioning

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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“…Flexible pressure sensing systems have attracted significant attention in both academic and industrial research recently, as the demand for various future applications, such as touch‐on flexible displays, soft robotics and energy harvesting, smart medical prosthetics, especially the rapid growth of wearable consumer electronics . To date, a variety of wearable pressure sensors have been developed based on the mechanism of force inducing these changes in capacitance, piezoelectricity, piezoresistivity, triboelectricity, etc.…”

Section: Introductionmentioning

confidence: 99%

Toward Flexible Wireless Pressure‐Sensing Device via Ionic Hydrogel Microsphere for Continuously Mapping Human‐Skin Signals

Tai

Yang

2017

Adv Materials Inter

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However, the following challenges still have to face, like the demanding materials (ultralonger nanowires, [15] ultrathin carbon nanotube/graphene film, [2] conducting polymer with special microstructure, [4] etc.), the fabrication of complicated structures based on micro/nano-electromechanical system technologies, [16] the challenging upscaling Si manufacturing processes, [17] strongly instrument dependence, [18] and not environmental friendly. [19] More important, these developed pressure sensors are mainly focused on sensitivity. [20,21] During practical application, they still need to be used with heavy equipment through cable for data delivery. Thereby, how to detect human pulse signals in a facile way and further to convey the perceived data to terminal devices with battery-less (or free) is very interesting for wearable electronic system.Radio frequency (RF) technology is one kind of wireless information transmission approach and a radio frequency antenna is its critical component. In this way, power will be transmitted from the sender coil to the receiver coil of the object by electromagnetic induction, and the relevant data information of the object will be received by the sender coil through the same principle. Up to now, it also has been applied to radio frequency identification, [22] transistor, [23] sensor, [24] actuator [25] in the traditional silicon and plastic electronics. But, the field of wearable RF sensor is still in its infancy. Like other emerging electronic technologies, both new materials and processing methods are the main driving forces for their everimproving development and performance.Herein, we report a new kind of flexible wireless pressuresensing device based on a chip-type ionic alginate hydrogel (IAH) microsphere, including (i) to synthesize a highly sensitive IAH microsphere as sensing component and to be sandwiched by a folded polyethylene terephthalate (PET) film with continuous silver patterns as both antenna and electrode through a stack of double-sided tape as bonding frame; (ii) to explain the sensing mechanism of the prepared wireless sensor system through a series of theories, which are very important to clarify the working mechanism and provide a significant guidance for this device design and preparation; and (iii) to further optimize the performance of the prepared flexible pressure sensor through the diameters of electrode sensing area, bending angles, and the antenna configurations. Its efficiency Flexible pressure-sensing systems have attracted more attention recently. Here, a novel kind of flexible wireless pressure-sensing device is reported based on a chip-type ionic alginate hydrogel (IAH) microsphere, which is sandwiched by a folded polyethylene terephthalate film with a continuous silver pattern as both antenna and electrode through a stack of double-sided tape as bonding frame. The whole device can be seen as an inductance (L)/capacitance (C)/resistance (R) (LCR) oscillation circuit and the main sensing mechanism is based on the variation of contact electri...

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Double‐Twisted Conductive Smart Threads Comprising a Homogeneously and a Gradient‐Coated Thread for Multidimensional Flexible Pressure‐Sensing Devices

Cited by 67 publications

References 45 publications

Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Recent Progress of Textile‐Based Wearable Electronics: A Comprehensive Review of Materials, Devices, and Applications

Advanced carbon materials for flexible and wearable sensors

Toward Flexible Wireless Pressure‐Sensing Device via Ionic Hydrogel Microsphere for Continuously Mapping Human‐Skin Signals

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