Development of a fabric structure strain sensor has received considerable attention due to its broad application in healthcare monitoring and human-machine interfaces. In the knitted textile structure, it is critical to understand the surface structural deformation from a different body motion, inducing the electrical signal characteristics. Here, we report the electromechanical properties of the knitted glove sensing system focusing on the compressive strain behavior. Compared with the electrical response of the tensile strain, the compressive strain shows much higher sensitivity, stability, and linearity via different finger motions. Additionally, the sensor exhibits constant electrical properties after repeated cyclic tests and washing processes. The proposed knitted glove sensing system can be readily extended to a scalable and cost-effective production due to the use of a commercialized manufacturing system.
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...
In article number 1600440, S. Park et al. report the fabrication of a quasicrystal electrode, which is demonstrated by an electro‐hydrodynamic narrow nozzle on substrate printing (e‐NDP) method to obtain a quasicrystal electrode (transferred electrode). This method can increase the electrode durability, as it provides better surface roughness, and allows for the fabrication of a novel, adaptive, waterproof electrode on any kind of surface for use in multifunctional electronics.
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