An ultra-sensitive and rapid response speed graphene pressure sensors for electronic skin and health monitoring

Lou, Zheng; Chen, Shuai; Wang, Lili; Jiang, Kai; Shen, Guozhen

doi:10.1016/j.nanoen.2016.02.053

Cited by 488 publications

(336 citation statements)

References 42 publications

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“…However, several obstacles limit the practical application of such sensors. Flexible pressure sensors often require elaborate nanostructured designs, and thus their fabrication requires multiple steps, high-vacuum conditions, and time-consuming syntheses [17][18][19][20][21] . Electrospinning has been widely employed to overcome these limitations and can be used in the fabrication of nanofibers (NFs) or microfibers composed of numerous materials, such as elastic polymers, conductive materials, and graphene [22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

“…Electrospinning has been widely employed to overcome these limitations and can be used in the fabrication of nanofibers (NFs) or microfibers composed of numerous materials, such as elastic polymers, conductive materials, and graphene [22][23][24][25] . In addition, electrospinning is suitable for rapidly producing large-area membranes with adjustable properties (high surface area, pore volume, and material type) under ambient conditions 20,23 . The most common method of fabricating highly conductive NFs is the direct electrospinning of conductive composite polymers on a flexible substrate.…”

Section: Introductionmentioning

confidence: 99%

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Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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Polymer-based pressure sensors play a key role in realizing lightweight and inexpensive wearable devices for healthcare and environmental monitoring systems. Here, conductive core/shell polymer nanofibers composed of poly (vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP)/poly(3,4-ethylenedioxythiophene) (PEDOT) are fabricated using three-dimensional (3D) electrospinning and vapor deposition polymerization methods, and the resulting sponge-like 3D membranes are used to create piezoresistive-type pressure sensors. Interestingly, the PEDOT shell consists of well-dispersed spherical bumps, leading to the formation of a hierarchical conductive surface that enhances the sensitivity to external pressure. The sponge-like 3D mats exhibit a much higher pressure sensitivity than the conventional electrospun 2D mats due to their enhanced porosity and pressure-tunable contact area. Furthermore, large-area, wireless, 16 × 10 multiarray pressure sensors for the spatiotemporal mapping of multiple pressure points and wearable bands for monitoring blood pressure have been fabricated from these 3D mats. To the best of our knowledge, this is the first report of the fabrication of electrospun 3D membranes with nanoscopically engineered fibers that can detect changes in external pressure with high sensitivity. The developed method opens a new route to the mass production of polymer-based pressure sensors with high mechanical durability, which creates additional possibilities for the development of human-machine interfaces.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

2018

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“…For example, Y Qin et al 27 Although the above-mentioned aerogels exhibit desirable conductivity and mechanical stability, some critical issues remain to be solved. Therefore, constructing bio-based GAs with high mechanical durability, structural continuity and high sensitivity to deformations for high performance strain sensors is still a big challenge 29 . Moreover, majority of previous reported aerogels are composed of non-biodegradable raw materials that cannot meet the trend of frequent updating of consumer electronics and may cause adverse impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Bio-based graphene/sodium alginate aerogels for strain sensors

et al. 2016

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Highly flexible strain sensors based on graphene aerogels (GAs) have been widely researched. However, most GAs are often found to be extremely weak and delicate to handle due to the π-π stacking and van der Waals interactions between adjacent graphene sheets that leads to a brittle skeleton. Thus constructing graphene structures with excellent mechanical properties, high sensitivity and effective conductive networks is still a big challenge. In this work, we fabricate a bio-based graphene/sodium alginate aerogel with high porosity (99.61%) and low density (6-7 mg/cm 3 ) via freeze drying and chemical reduction. The resulting aerogels exhibit outstanding durability (>6000 loading-unloading cycles), excellent sensitivity to compression (gauge factor is 1.01) and bending (bending sensitivity is 0.172 rad -1 ).The strong hydrogen bonding interactions between graphene and SA are responsible for the synergetic enhancement of strength and elasticity. Taking advantage of the combination of the electronic conductivity and mechanical flexibility, the proposed bio-based aerogels may be a robust candidate in flexible strain sensors. Graphical Abstract:Bio-based graphene aerogels are fabricated with graphene oxide and sodium alginate, showing great potentials in flexible strain sensors due to the excellent mechanical stability and high sensitivity to compression and bending deformations.

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“…In order to improve the sensing performances of graphene-based sensors, various sensitive materials have been selected to modify the graphene conductive network, and they play important roles in improving the sensitivity and selectivity of resultant gas sensors [16,17,18,19]. To date, the most popular method of preparing monolayer or multilayer graphene is the micromechanical cleavage or chemical exfoliation of highly oriented pyrolytic graphite or graphite oxide [20,21,22,23,24,25]. Recently, exfoliated graphene was prepared directly from graphite with solvothermal method, offering another method for graphene preparation [26].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

Zhang

Cen

et al. 2016

Sensors

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ZnO/graphene (ZnO-G) hybrid composites are prepared via hydrothermal synthesis with graphite, N-methyl-pyrrolidone (NMP), and Zn(NO3)2·6H2O as the precursors. The characterizations, including X-ray diffraction (XRD), thermogravimetric analyses (TGA), Raman spectroscopy, and transmission electron microscopy (TEM) indicate the formation of ZnO-G. Gas sensors were fabricated with ZnO-G composites and ZnO as sensing material, indicating that the response of the ZnO towards acetone was significantly enhanced by graphene doping. It was found that the ZnO-G sensor exhibits remarkably enhanced response of 13.3 at the optimal operating temperature of 280 °C to 100 ppm acetone, an improvement from 7.7 with pure ZnO.

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An ultra-sensitive and rapid response speed graphene pressure sensors for electronic skin and health monitoring

Cited by 488 publications

References 42 publications

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Wearable high-performance pressure sensors based on three-dimensional electrospun conductive nanofibers

Bio-based graphene/sodium alginate aerogels for strain sensors

Enhanced Acetone Sensing Characteristics of ZnO/Graphene Composites

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