Mechanical Stability of Flexible Graphene-Based Displays

Anagnostopoulos, George; Pappas, Panagiotis; Li, Zheling; Kinloch, Ian A.; Young, Robert J.; Новоселов, К. С.; Lu, Chien Lin; Pugno, Nicola; Parthenios, John; Galiotis, Costas; Papagelis, Konstantinos

doi:10.1021/acsami.6b05227

Cited by 58 publications

(41 citation statements)

References 56 publications

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“…The effect is demonstrated in the video files of the simulations that we provide in the ESI. † Indeed, folds like that surround flat regions of graphene in two dimensions have been observed by us 16,18 in simply supported CVD graphene that has been subjected to extremely high strain when cooled from high temperature during the production process.…”

Section: Resultsmentioning

confidence: 86%

“…Wrinkling of supported graphene under compression has been examined in various studies, 8,[13][14][15] as well as the effect of heavy wrinkled topography present in CVD graphene to the tensile performance and the reinforcing capabilities. [16][17][18] On the other hand, little attention has been given to the formation of these instabilities under tension. 11 In the present work we examine the wrinkling failure of simply supported graphene flakes under both tension and compression.…”

Section: Introductionmentioning

confidence: 99%

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Wrinkling formation in simply-supported graphenes under tension and compression loadings

et al. 2017

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Wrinkles in supported graphenes can be formed either by uniaxial compression or uniaxial tension beyond a certain critical load depending on the mode of loading. In the first case, the wrinkling direction is normal to the compression axis whereas in tension, wrinkles of the same pattern are formed parallel to the loading direction due to Poisson's (lateral) contraction. Herein we show by direct AFM observations that in simply-supported graphenes such instabilities appear as periodic wrinkles over existing stochastic undulations caused by the underlying-substrate-roughness. The critical strain for the generation of these wrinkles in both tension and compression is less than 1% which particularly for the former is far lower than the predicted tensile strain to fracture of suspended graphene estimated at ∼30%. Based on these findings, a constitutive model that provides the critical tensile strain for induced buckling in the lateral direction is proposed that depends only on the graphene-support interaction and not on the nature of the substrate. Understanding the wrinkling failure of graphenes under strain is of paramount importance as it leads to new threshold limits beyond which the physical-mechanical properties of graphene are impaired.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Wrinkling formation in simply-supported graphenes under tension and compression loadings

et al. 2017

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“…However, this problem can be circumvented by integrating the Gr/EVA layer last in a device. This way, flexible solar cells, 9 triboelectric generators 38 and touch screens 39 using Gr/EVA have been demonstrated. The use of PET as a substrate is well suited for flexible electronics due to its mechanical strength and transparency.…”

Section: Resultsmentioning

confidence: 99%

Repeated roll-to-roll transfer of two-dimensional materials by electrochemical delamination

Hempel

Hui

et al. 2018

Nanoscale

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Two-dimensional (2D) materials such as graphene (Gr), molybdenum disulfide and hexagonal boron nitride (hBN) hold great promise for low-cost and ubiquitous electronics for flexible displays, solar cells or smart sensors. To implement this vision, scalable production, transfer and patterning technologies of 2D materials are needed. Recently, roll-to-roll (R2R) processing, a technique that is widely used in industry and known to be cost-effective and scalable, was applied to continuously grow and transfer graphene. However, more work is needed to understand the possibilities and limitations of this technology to make R2R processing of 2D materials feasible. In this work, we fabricated a custom R2R transferring system that allows the accurate control of the process parameters. We employ continuous electrochemical delamination, known as "bubble transfer", to eliminate chemical etchant waste and enable the continuous transfer of 2D materials from metal foils. This also makes our transfer method a renewable and environmentally friendly process. We investigate the surface topology as well as the electrical parameters of roll-to-roll transferred graphene on polyethylene terephthalate (PET) coated with ethylene-vinyl acetate (EVA). Furthermore, we demonstrate for the first time the stacking of two layers of graphene or graphene on hBN by repeated lamination and delamination onto EVA/PET. These results are an important contribution to creating low-cost, large scale and flexible electronics based on 2D materials.

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“…To expand the application of micro-patterned rGO that was confirmed to have sufficient current flow by the successful laser-scribed reduction of GO, we generated large scale flexible microcircuit arrays with relatively complicated configurations in the designed drawing area, utilizing the advantage of the programmable laser direct writing. This was important because the patterned conductive films with specific structures in a flexible format can be applied to a variety of applications such as touch sensors, displays, solar cells, biosensors, and other possible unconventional electronics similar to the flexible printed circuit board (FPCB) [ 56 , 57 , 58 , 59 , 60 ]. In this study, we suggest a simple prototype of flexible circuit substrates composed of laser-scribed graphene formed on the polymeric materials.…”

Section: Resultsmentioning

confidence: 99%

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

Park

Kim

Lone

et al. 2018

Sensors

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The conversion of graphene oxide (GO) into reduced graphene oxide (rGO) is imperative for the electronic device applications of graphene-based materials. Efficient and cost-effective fabrication of highly uniform GO films and the successive reduction into rGO on a large area is still a cumbersome task through conventional protocols. Improved film casting of GO sheets on a polymeric substrate with quick and green reduction processes has a potential that may establish a path to the practical flexible electronics. Herein, we report a facile deposition process of GO on flexible polymer substrates to create highly uniform thin films over a large area by a flow-enabled self-assembly approach. The self-assembly of GO sheets was successfully performed by dragging the trapped solution of GO in confined geometry, which consisted of an upper stationary blade and a lower moving substrate on a motorized translational stage. The prepared GO thin films could be selectively reduced and facilitated from the simple laser direct writing process for programmable circuit printing with the desired configuration and less sample damage due to the non-contact mode operation without the use of photolithography, toxic chemistry, or high-temperature reduction methods. Furthermore, two different modes of the laser operating system for the reduction of GO films turned out to be valuable for the construction of novel graphene-based high-throughput electrical circuit boards compatible with integrating electronic module chips and flexible humidity sensors.

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Mechanical Stability of Flexible Graphene-Based Displays

Cited by 58 publications

References 56 publications

Wrinkling formation in simply-supported graphenes under tension and compression loadings

Wrinkling formation in simply-supported graphenes under tension and compression loadings

Repeated roll-to-roll transfer of two-dimensional materials by electrochemical delamination

One-Step Laser Patterned Highly Uniform Reduced Graphene Oxide Thin Films for Circuit-Enabled Tattoo and Flexible Humidity Sensor Application

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