Visualization of Delamination in Encapsulated Flexible Electronics Fabricated using Slot Die Coating

Jeong, Tae-Joong; Prasath, R.G.R.; Sitaraman, Suresh K.; Harris, Tequila A. L.

doi:10.1007/s11664-020-08065-2

Cited by 5 publications

(2 citation statements)

References 21 publications

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“…As for the spray-coated film, the adhesion was very poor; the whole film delaminated (0B) as shown in Figure g–i. It has been shown experimentally that thicker coatings improve adhesion testing results. − Hence, the poor adhesion exhibited by the spray-coated samples is attributed to the film thickness (which is on the order of 1–5 μm) and preexisting deformation of the overall coating. Moreover, the slot die-coated CA film was UV-treated, which is believed to enhance bonding between the fluid and the substrate material as it was drying.…”

Section: Resultsmentioning

confidence: 99%

Roll-to-Roll, Dual-Layer Slot Die Coating of Chitin and Cellulose Oxygen Barrier Films for Renewable Packaging

Jung

Jeong

et al. 2022

ACS Appl. Mater. Interfaces

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Cellulose and chitin are the two most abundant naturally produced biopolymers and are being extensively studied as candidates for renewable oxygen barrier films used in packaging. It has been shown that bilayers formed from cellulose nanocrystals (CNCs) and chitin nanofibers (ChNFs) exhibit oxygen barrier properties similar to polyethylene terephthalate (PET). However, this prior work explored only coating each layer individually in sequence through techniques such as spray coating. Here, we demonstrate the viability of dual-layer slot die coating of CNC/ChNF bilayers onto cellulose acetate (CA) substrates. The dual-layer slot die method enables significantly lower oxygen permeability versus spray coating while using a roll-to-roll system that applies the bilayer in a single pass. This work discusses suspension properties, wetting, and drying conditions required to achieve well-controlled ChNF/CNC bilayers. Spray-coated bilayer films were on average 25% thinner than the dual-layer bilayer film; however, the thickness-normalized oxygen permeability (OP) of the dual-layer-coated ChNF/CNC bilayer film on CA was 20 times better than that of the spray-coated bilayers. It has been shown that ChNF contributes to the wetting and barrier properties. Values of OP for the slot die-coated bilayers under optimized drying conditions were as low as 1.2 cm3·μm·m–2·d–1·kPa−1, corresponding to a normalized oxygen transmission rate of 0.32 cm3·m–2·d–1 at 23 °C and 50% relative humidity. It is also noted that the adhesive properties of the dual-layer coating are also improved when films are air-dried and that ChNF contributes to the wetting and barrier properties.

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Section: Resultsmentioning

confidence: 99%

Roll-to-Roll, Dual-Layer Slot Die Coating of Chitin and Cellulose Oxygen Barrier Films for Renewable Packaging

Jung

Jeong

et al. 2022

ACS Appl. Mater. Interfaces

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“…This non-destructive and intuitive method has multiple forms of measurement and can reveal internal stress. The photoelastic method has been employed to measure full-field stresses in flexible electronic devices, such as the work of Jeong et al, which analyzed the effects of flexible electronic packaging under different tensile strains [8]. Meanwhile, infrared photoelastic techniques have developed rapidly, which have been applied to stress analysis of semiconductor electronic structures such as Through-Silicon Vias [9], microelectromechanical systems [10], and solar silicon wafers [11].…”

Section: Introductionmentioning

confidence: 99%

A Transmission-Reflection Photoelastic Combined Technique for Internal Stress Analysis of Inorganic Flexible Electronic Bilayer Structures

He,

Du,

Zhang

et al. 2023

Advances in Transdisciplinary Engineering

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In recent years, inorganic flexible electronics technology has been widely researched as a promising field that enables semiconductor devices to combine excellent electrical and flexible properties for various electronic applications. However, rigid semiconductor materials are susceptible to fracture during service, leading to functional failure. Therefore, mechanical reliability testing is essential for these devices. Digital photoelasticity is one of the techniques that can be used for stress analysis of semiconductor materials, which is a non-destructive, full-field, real-time experimental method based on photoelasticity. In this paper, a transmission-reflection photoelastic combined technique is proposed for internal stress analysis of inorganic flexible electronic bilayer structures. This technique can achieve non-contact, in-situ, parallel measurement of internal stress fields. A transmission-reflection photoelastic bidirectional combined experimental system is developed. A photoelastic parameter extraction technique for stress decoupling of bilayer structures is introduced. An experimental study on the quantitative characterization of the internal stress field of each layer is conducted for a typical class of inorganic flexible electronic bilayer structures.

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Scalable coating methods for enhancing glass fiber–epoxy interactions with cellulose nanocrystals

et al. 2021

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Visualization of Delamination in Encapsulated Flexible Electronics Fabricated using Slot Die Coating

Cited by 5 publications

References 21 publications

Roll-to-Roll, Dual-Layer Slot Die Coating of Chitin and Cellulose Oxygen Barrier Films for Renewable Packaging

Roll-to-Roll, Dual-Layer Slot Die Coating of Chitin and Cellulose Oxygen Barrier Films for Renewable Packaging

A Transmission-Reflection Photoelastic Combined Technique for Internal Stress Analysis of Inorganic Flexible Electronic Bilayer Structures

Scalable coating methods for enhancing glass fiber–epoxy interactions with cellulose nanocrystals

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