Improving the stretchability of as-deposited Ag coatings on poly-ethylene-terephthalate substrates through use of an acrylic primer

Sim, Gi-Dong; Won, Sejeong; Jin, Chun Yan; Park, Inkyu; Lee, Soon-Bok; Vlassak, Joost J.

doi:10.1063/1.3567917

Cited by 46 publications

(34 citation statements)

References 34 publications

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“…Ethylene carbonate mixed with ethyl methyl carbonate, LiPF 6 and micro-porous polypropylene monolayer 26 were used as the electrolyte, lithium salt and separator, respectively. We selected polyimide as the substrate to which the electrodes attach and Ag current collectors for their strong adhesion and stretchability 27 . The polyimide substrates were encapsulated by castable rubber, such as polydimethylsilane (PDMS) or polyurethane.…”

Section: Resultsmentioning

confidence: 99%

“…We chose Kapton Polyimide (PI) film as the flexible substrate. PI films provide flexibility, chemical compatibility with lithium ion electrolytes and strong adhesion between the film and electrode materials 27 . The device fabricated on several other flexible substrates resulted in electrode film cracking, little electrical conductivity or delamination during electrochemical lithiation step.…”

Section: Methodsmentioning

confidence: 99%

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Electrochemically driven mechanical energy harvesting

et al. 2016

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Efficient mechanical energy harvesters enable various wearable devices and auxiliary energy supply. Here we report a novel class of mechanical energy harvesters via stress–voltage coupling in electrochemically alloyed electrodes. The device consists of two identical Li-alloyed Si as electrodes, separated by electrolyte-soaked polymer membranes. Bending-induced asymmetric stresses generate chemical potential difference, driving lithium ion flux from the compressed to the tensed electrode to generate electrical current. Removing the bending reverses ion flux and electrical current. Our thermodynamic analysis reveals that the ideal energy-harvesting efficiency of this device is dictated by the Poisson's ratio of the electrodes. For the thin-film-based energy harvester used in this study, the device has achieved a generating capacity of 15%. The device demonstrates a practical use of stress-composition–voltage coupling in electrochemically active alloys to harvest low-grade mechanical energies from various low-frequency motions, such as everyday human activities.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Electrochemically driven mechanical energy harvesting

et al. 2016

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“…As a result, metal thin films, which are key components in these devices, have been studied extensively. These investigations have demonstrated that the mechanical properties of thin films are generally very different from those of their bulk counterparts [1][2][3][4][5][6][7][8][9][10][11] and that they depend on whether the film is freestanding or supported by a substrate [12][13][14][15]. Understanding the mechanical behavior of metal thin films at elevated temperature is essential for the design of reliable devices, which often operate above room temperature.…”

Section: Introductionmentioning

confidence: 99%

High-temperature tensile behavior of freestanding Au thin films

Sim

Vlassak

2014

Scripta Materialia

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The mechanical behavior of freestanding thin sputter-deposited films of Au is studied at temperatures up to 340°C using tensile testing. Films tested at elevated temperatures exhibit a significant decrease in flow stress and stiffness. Furthermore the flow stress decreases with decreasing film thickness, contravening the usual notion that "smaller is stronger". This behavior is attributed mainly to diffusion-facilitated grain boundary sliding.Keywords: In situ tensile test, High-temperature deformation, Thin films, Grain boundary sliding, Creep IntroductionThe decreasing size of microelectronics devices has motivated a strong interest in the effects of length scales on the mechanical behavior of thin films of metal. As a result, metal thin films, which are key components in these devices, have been studied extensively. These investigations have demonstrated that the mechanical properties of thin films are generally very different from those of their bulk counterparts [1][2][3][4][5][6][7][8][9][10][11] and that they depend on whether the film is freestanding or supported by a substrate [12][13][14][15]. Understanding the mechanical behavior of metal thin films at elevated temperature is essential for the design of reliable devices, which often operate above room temperature. Several studies have been performed on the high-temperature behavior of films on substrates [2,[16][17][18][19], but studies on freestanding films have been limited to temperatures below 200ºC [20][21][22][23] due to difficulties associated with sample handling, oxidation, and temperature uniformity in the sample. The few studies performed at higher temperatures focused on films that were several microns thick [24][25][26]. Thus, the high-temperature behavior of freestanding metal thin films is still relatively unexplored. Recently, we developed a technique for the tensile testing of freestanding thin films in which samples were mounted on a micro-machined silicon frame with integrated heaters [27]. The samples were deformed in-situ inside a scanning electron microscope (SEM) by means of a custom-built test apparatus. Using this technique, the stress-strain curves of copper thin films were measured at temperatures up to 430°C. In this paper, the same technique is used to characterize the mechanical behavior of gold films as a function of temperature and strain rate. Gold was chosen as the material of interest due to its oxidation resistance and low electrical resistivity. The oxidation resistance makes gold an interesting material for studying the inherent mechanical behavior at elevated temperature without the added complication of a passivation

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“…Also, R 0 and L 0 are the corresponding initial values. Generally, this equation is applied to a metal thin film deposited by sputtering and thermal or E-beam evaporation [29], but we adopted this method to evaluate the metal NP thin film. According to this theory, failure strain is determined at the point at which the experimental resistance curve is off by more than 5% from the theoretical curve.…”

Section: Resultsmentioning

confidence: 99%

Reinforcing Ag nanoparticle thin films with very long Ag nanowires

Lee

et al. 2013

Nanotechnology

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We employed very long nanowires mixed into nanoparticle thin films to improve their weak crack resistance for flexible electronics. We also measured the dependence of the failure strain and resistivity of the Ag nanowire-reinforced Ag nanoparticle thin films on the wt% and sintering condition of nanowires by means of resistance measurements under tension in an in situ tensile tester. Very long nanowires of over 90 μm suppressed thin film cracking by bridging cracks in both the transverse and longitudinal directions and also reduced the electrical resistivity under tension. Moreover, diffusion and growth of nanowires induced by the thermal annealing process was observed, resulting in a highly increased failure strain. Due to the use of the same materials, effective diffusion was facilitated, thus inducing strong bonds between nanoparticles and nanowires.

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Improving the stretchability of as-deposited Ag coatings on poly-ethylene-terephthalate substrates through use of an acrylic primer

Cited by 46 publications

References 34 publications

Electrochemically driven mechanical energy harvesting

Electrochemically driven mechanical energy harvesting

High-temperature tensile behavior of freestanding Au thin films

Reinforcing Ag nanoparticle thin films with very long Ag nanowires

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