Screen-Printed Stretchable Interconnects

Suikkola, Jari; Kankkunen, Timo; Iso-Ketola, Pekka; Vanhala, Jukka; Mäntysalo, Matti

doi:10.1109/ectc.2016.132

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The first batch of samples, used for the basic properties determination with NaCl electrolyte, had on average thicker electrodes than the subsequent printed batches due to the manual printing process. Such differences can occur, for example, due to changing the printer operator27.…”

Section: Resultsmentioning

confidence: 99%

Performance, stability and operation voltage optimization of screen-printed aqueous supercapacitors

Lehtimäki

Railanmaa

Keskinen

et al. 2017

Sci Rep

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Harvesting micropower energy from the ambient environment requires an intermediate energy storage, for which printed aqueous supercapacitors are well suited due to their low cost and environmental friendliness. In this work, a systematic study of a large set of devices is used to investigate the effect of process variability and operating voltage on the performance and stability of screen printed aqueous supercapacitors. The current collectors and active layers are printed with graphite and activated carbon inks, respectively, and aqueous NaCl used as the electrolyte. The devices are characterized through galvanostatic discharge measurements for quantitative determination of capacitance and equivalent series resistance (ESR), as well as impedance spectroscopy for a detailed study of the factors contributing to ESR. The capacitances are 200–360 mF and the ESRs 7.9–12.7 Ω, depending on the layer thicknesses. The ESR is found to be dominated by the resistance of the graphite current collectors and is compatible with applications in low-power distributed electronics. The effects of different operating voltages on the capacitance, leakage and aging rate of the supercapacitors are tested, and 1.0 V found to be the optimal choice for using the devices in energy harvesting applications.

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Section: Resultsmentioning

confidence: 99%

Performance, stability and operation voltage optimization of screen-printed aqueous supercapacitors

Lehtimäki

Railanmaa

Keskinen

et al. 2017

Sci Rep

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“…As conductive plastics and inks are developed and used, 3D printing can combine several process steps and 3D-printed electronic modules can be made on a stretchable substrate by a single-step method. With recent inventions, such as clover-shaped modules, new customizable and durable wearable electronics can be created [22].…”

Section: Tensile Testsmentioning

confidence: 99%

Enhanced stretchable electronics made by fused-filament fabrication

Salo

Halme

Lahtinen

et al. 2020

Flex. Print. Electron.

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3D printing is widely used for manufacturing complex non-functional parts, and recently, the fabrication of electronics has also attracted research attention. The commercialized process of fused-filament fabrication (FFF), which is still evolving,has been used in the preparation of basic electronic conductors and sensors but only a few studies of more complex structures with integrated circuits and passive components have been reported. Notably, the usage of FFF in wearable stretchable electronics has not been studied previously. We demonstrate that the combination of FFF printing and commonly used stretchable electronics materials and methods enables new wearable stretchable electronics. In this study, thermoplastics were extruded directly onto a stretchable substrate and their adhesion was measured using T-peel tests. The test results were further used in the fabrication of supports for meander-shaped screen-printed interconnects. The elongation of the interconnects with the supports were studied by tensile tests with simultaneous measurements of the electrical conductivity. The results were good, and the adhesion exceeded the constitution of the substrate when the filament and the substrate were of the same material type. The average bond strength was ∼2 N mm−1. Support structures placed close to the meander-shaped interconnects changed the interconnects’ deformation under elongation. The average maximum elongation of the interconnects was improved by ∼27% when the supports directed stresses away from the interconnects’ weak areas. Conversely, the results were ∼21% lower when the supports directed stresses towards the weak areas. This study demonstrates that it is possible to use direct 3D printing onto highly stretchable substrates. Currently, commercial FFF materials and methods can be used to manufacture supports, frames and other non-functional parts on wearable electronics substrates in a single process step. We believe that in the future, FFF will become a valuable tool in the manufacture of inexpensive and reliable wearable electronics.

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“…At last, because of the composite nature of the materials, they often exhibit the piezoresistive effect, which is discussed in Section 2.3.2.1. EMS CI-1036 [74,75] Thermal Stretchable 10 4 10 @ 25 µm LOCTITE EDAG PD004A E&C [76] UV Flexible 800 6 @ 25 µm…”

Section: Filamentsmentioning

confidence: 99%

3D Printed sensors and bio-electronics for robotic applications

Schouten¹

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Screen-Printed Stretchable Interconnects

Cited by 4 publications

References 7 publications

Performance, stability and operation voltage optimization of screen-printed aqueous supercapacitors

Performance, stability and operation voltage optimization of screen-printed aqueous supercapacitors

Enhanced stretchable electronics made by fused-filament fabrication

3D Printed sensors and bio-electronics for robotic applications

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