A study of screen printing of stretchable circuits on polyurethane substrates

Zhong, Zhao; Tang, Reuben Wei Liang; Chen, S. H.; Shan, Xuechuan

doi:10.1007/s00542-018-3969-0

Cited by 18 publications

(12 citation statements)

References 29 publications

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“…The particle transfer ratio could then be derived as the ratio of number of silver particles in dry mass of a segment to the number of silver particles in the gravure cells of a segment as shown in Equation (8).…”

Section: Ink Transfer Modelingmentioning

confidence: 99%

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Investigation of Roll-to-Roll Gravure Printing for Printed Electronics with Fine Features

Chen¹,

Pua²,

Zhong³

et al. 2020

J. Mater. Appl.

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Gravure printing is known to be cost competitive in manufacturing of printed electronic devices due to its capability to mass produce at lower costs. Current standard of gravure printed feature sizes is in a range of around 50 μm down to sub-10 μm, predominantly through small scale setups and specialized engraving. However, reliance on gravure cell design limits the scalability of printing over a large area due to the setup cost. In this study, ink viscoelastic behavior was modified to improve replication of gravure printed features over a large printing area of 300 mm web-width without a reduction in gravure cell dimension. Fine lines were printed using a high viscosity ink with a good replication of the nominal line width. Control over the printed features was performed through the variation of printing speed and the alteration of ink viscosity. The effects of ink viscosity and printing speed on the printed ink particle distribution and size were also examined. New methodologies of characterizing ink transfer were also developed to help understand the ink transfer processes: mass transfer and particle transfer. A deeper understanding of the thixotropic effect and shear recovery behavior of inks was achieved through simulations of shearing conditions.

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Section: Ink Transfer Modelingmentioning

confidence: 99%

“…R2R is employed for production of flexible, high-volume printed electronics. Inkjet printing, gravure printing, screen printing [8] and flexographic printing [9] may be conducted for printed electronics. Flexographic printing and gravure printing are more suitable for continuous R2R, large format and high speed printing [4,5].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Roll-to-Roll Gravure Printing for Printed Electronics with Fine Features

Chen¹,

Pua²,

Zhong³

et al. 2020

J. Mater. Appl.

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“…As the processing parameters of the ink can often be kept below 130 °C, soft and sensitive substrates can be used . Silicone elastomers, such as PDMS, are often used in stretchable electronics due to their good mechanical properties and chemical stability. ,, However, their low surface energy and adhesion, together with contamination issues, make them less suitable for screen printing. , Instead, some of the most commonly and successfully employed elastic substrates for screen printing are polyurethanes (PU) and thermoplastic polyurethane variants (TPU) due to their good elasticity, stability, and higher surface energy, which facilitates additive manufacturing. , The properties of the elastic matrix of a stretchable screen printing ink are of equal importance, as the ink needs similarly high surface energy as the substrate to adhere well and avoid delamination and cracking during deformation. State-of-the-art stretchable conductive inks commonly consist of silver (Ag) or carbon filler particles and an elastomer binder, together forming a solid yet soft stretchable composite conductor after printing and curing steps. − Carbon materials, such as carbon black, graphite and graphene nanoplatelets, and carbon nanotubes, generally lack the high conductivity necessary for interconnects in many applications. − Silver is the most widely used conductive filler in screen printing inks, being relatively affordable and highly conductive.…”

Section: Introductionmentioning

confidence: 99%

Screen-Printed Corrosion-Resistant and Long-Term Stable Stretchable Electronics Based on AgAu Microflake Conductors

Boda

Strandberg

Eriksson

et al. 2023

ACS Appl. Mater. Interfaces

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High-throughput production methods such as screen printing can bring stretchable electronics out of the lab into the market. Most stretchable conductor inks for screen printing are based on silver nanoparticles or flakes due to their favorable performance-to-cost ratio, but silver is prone to tarnishing and corrosion, thereby limiting the stability of such conductors. Here, we report on a cost-efficient and scalable approach to resolve this issue by developing screen printable inks based on silver flakes chemically coated by a thin layer of gold. The printed stretchable AgAu conductors reach a conductivity of 8500 S cm −1 , remain conductive up to 250% strain, show excellent corrosion and tarnishing stability, and are used to demonstrate wearable LED and NFC circuits. The reported approach is attractive for smart clothing, as the long-term functionality of such devices is expected in a variety of environments.

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“…Typical flexible circuit fabrication technologies are divided into five categories: template based (screen printing, [5][6][7] mask printing, [8] roll-to-roll printing [9,10] etc. ); droplet based (inkjet printing, [11] aerosol jet printing, [12,13] and electric fluid jet printing, [14][15][16] etc.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Adhesion and Antibending Performance of Ag Circuit on Polyimide Fabricated by Heat‐Assisted Direct Ink Writing Method

Xie

Shen

et al. 2022

Physica Status Solidi (a)

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Herein, flexible circuits with enhanced adhesion and antibending resistance are fabricated by heat‐assisted direct ink writing. The experimental parameters are explored under different nozzle sizes, angles, heights, direct writing speeds, and heating temperatures by selecting an appropriate extrusion speed. The solvent evaporation caused by heating temperature enables the metal particles to densify quickly to form a conductive path. This method is suitable for fabricating devices on polyimide (PI) with appropriate direct writing parameters and is simple to operate. A flexible Ag circuit with a resistivity of 4.31 × 10−8 Ω m and good resistance after 20 000 consecutive bending cycles is fabricated with a nozzle size of 32G, a nozzle height of 10 μm, a nozzle angle of 90°, an extrusion speed of 5 μm min−1, a substrate heating temperature of 70 °C, and a direct writing speed of 1 mm s−1. Large‐area complex flexible display LED arrays are fabricated using thermally assisted direct ink writing.

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A study of screen printing of stretchable circuits on polyurethane substrates

Cited by 18 publications

References 29 publications

Investigation of Roll-to-Roll Gravure Printing for Printed Electronics with Fine Features

Investigation of Roll-to-Roll Gravure Printing for Printed Electronics with Fine Features

Screen-Printed Corrosion-Resistant and Long-Term Stable Stretchable Electronics Based on AgAu Microflake Conductors

Enhancement of Adhesion and Antibending Performance of Ag Circuit on Polyimide Fabricated by Heat‐Assisted Direct Ink Writing Method

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