A highly stretchable strain sensor based on a graphene/silver nanoparticle synergic conductive network and a sandwich structure

Chen, Song; Wei, Yong; Xue, Yuan; Lin, Yong; Liu, Lan

doi:10.1039/c6tc00300a

Cited by 210 publications

(166 citation statements)

References 44 publications

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“…Finally, silver nanoisland-graphene composites have been used for other wearable applications, including speech detection (Figure 4d) and bending of fingers (Figure 4e). 52 …”

Section: Mechanical Sensingmentioning

confidence: 99%

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Metallic nanoislands on graphene: a metamaterial for chemical, mechanical, optical, and biological applications

et al. 2017

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Graphene decorated with metallic nanoparticles exhibits electronic, optical, and mechanical properties that neither the graphene nor the metal possess alone. These composite films have electrical conductivity and optical properties that can be modulated by a range of physical, chemical, and biological signals. Such properties are controlled by the morphology of the nanoisland films, which can be deposited on graphene using a variety of techniques, including in situ chemical synthesis and physical vapor deposition. These techniques produce non-random (though loosely defined) morphologies, but can be combined with lithography to generate deterministic patterns. Applications of these composite films include chemical sensing and catalysis, energy storage and transport (including photoconductivity), mechanical sensing (using a highly sensitive piezroresistive effect), optical sensing (including so-called “piezoplasmonic” effects), and cellular biophysics (i.e sensing the contractions of cardiomyocytes and myoblasts).

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“…Finally, silver nanoisland-graphene composites have been used for other wearable applications, including speech detection (Figure 4d) and bending of fingers (Figure 4e). 52 …”

Section: Mechanical Sensingmentioning

confidence: 99%

“…The phrase “Hi, how are you” is shown in (e) for three separate human subjects, which show similar waveforms. (d) And (e) reprinted with permission from reference 52 and the Royal Society of Chemistry. The resistance of a AuNI-Gr substrate can vary with temperature and cause unwanted thermal drift.…”

Section: Figurementioning

confidence: 99%

Metallic nanoislands on graphene: a metamaterial for chemical, mechanical, optical, and biological applications

et al. 2017

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“…The electrode formed at a low heating temperature (60 °C for 1 h) has a lower electrical resistance than the electrode made at room temperature (25 °C for 1 d) due to the relatively easy rearrangement of silver nanoparticles with long-range translational order and a high binding energy that can be obtained at 60 °C. [35,36] Figure 5a1,a2 (inset) shows pristine transferred electrodes processed at a low temperature as well as the electrode in a bent state. However, if the electrode is transferred with an adhesive tape, the electrical resistance of the electrode increases.…”

Section: Figurementioning

confidence: 99%

Fabrication of a Quasicrystal Electrode at a Low Processing Temperature via Electrohydrodynamic and Transfer Printing for use in Multifunctional Electronics

Park

et al. 2017

Adv Elect Materials

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temperature or with heating at less than 60 °C for 1 h. This is not only one of the important conditions for determining the degree of aggregation of silver, but also for controlling the binding energy of silver or the density of silver that would be higher at the bottom. [18,19] We can also transfer print from the receiver to the adhesive tape, which results in a quasicrystal morphology (R a = nanoscale) with truly excellent flexibility and durability. [8][9][10]21,22] With this approach, we can fabricate flexible tiled circuits, water-proof light emitting diodes (LEDs) without any additional restricting condition, and this transferred electrode would be freestanding, attached to various uneven interface operated LEDs. A merit of this method is that, without adaptive printing on the 3D circuits, we can apply the electrodes on 3D structures by using the projected electrodes.Furthermore, these electrodes are connected to each other to produce long-ranged line pattern arrays, and the soldering disconnection of a wire can be achieved with the nonpatterned residue of the adhesive region.Based on this study, e-NDP can be considered as a new method, which is different from the existing EHD method that needs the condition of a nozzle-to-substrate distance of less than 500 µm for the near-field electrospinning jet. In the existing EHD method, only the Si wafer and the glass substrate through which charged electrons can be transferred to the ground and only their parts in which the solution is aligned after taylorcone formation at the nozzle tip have been used. [11][12][13]15,16,20] We propose a patterning mechanism that offers a closer nozzleto-substrate distance than conventional EHD printing operating at less than 100 µm to easily charge the electron moving nozzle with ground (GNR) in spite of using an insulated PET substrate (Figure 1a,b, inset). This method can be used to fabricate a silver micropatterned electrode that can be printed in ≈4 s (20 mm s −1 is the optimized speed for formation of the electrode) with a 70 mm parallel line pattern. This electrode resolution was controlled by increasing the printing speed ( Figure S1a,b, Supporting Information). Figure 1 shows a schematic to fabricate a silver micropatterned electrode using the e-NDP process. The first step is to pattern a silver trace after printing the e-NDP solution on a PET substrate coated with silver trifluoroacetate (STA) (18 wt%) dissolved in volatile tetrahydrofuran (THF). The second step is to reduce the silver trace pattern using a hydrazine monohydrate solution with ethyl alcohol (30 wt%). This solution is overpatterned on the position of the silver trace at a low temperature of 60 °C for 1 h. As the experimental equipment has a function of automatically performing overpatterning, misalignment could not occur during same-trace-position printing.Pattern formation is a complex technology that has resulted from a collaborative effort by researchers in chemistry and industrial processing. Bath processing has been implemented by a myriad of organiza...

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“…For example, a highly stretchable strain sensors made of graphene and Ag NPs was fabricated [238]. Graphene could bridge the adjacent NPs, leading to a high stretchability of 1000%.…”

Section: Graphene and Hybrid Films For Flexible Sensorsmentioning

confidence: 99%

“…Besides, to fabricate sensors with high sensitivity and flexibility, graphene integrated with metal nanomaterials, or CNTs has attracted much attention [72,117,130,238]. For example, a highly stretchable strain sensors made of graphene and Ag NPs was fabricated [238].…”

Section: Graphene and Hybrid Films For Flexible Sensorsmentioning

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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A highly stretchable strain sensor based on a graphene/silver nanoparticle synergic conductive network and a sandwich structure

Abstract: A highly stretchable strain sensor with a graphene/silver nanoparticle synergic conductive network and a sandwich structure was fabricated.

Cited by 210 publications

References 44 publications

Metallic nanoislands on graphene: a metamaterial for chemical, mechanical, optical, and biological applications

Metallic nanoislands on graphene: a metamaterial for chemical, mechanical, optical, and biological applications

Fabrication of a Quasicrystal Electrode at a Low Processing Temperature via Electrohydrodynamic and Transfer Printing for use in Multifunctional Electronics

Advanced carbon materials for flexible and wearable sensors

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