Direct transfer of graphene onto flexible substrates

Martins, Luiz G. P.; Song, Yi; Zeng, Tingying Helen; Dresselhaus, M. S.; Kong, Jing; Araújo, Paulo T.

doi:10.1073/pnas.1306508110

Cited by 177 publications

(131 citation statements)

References 29 publications

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“…This result showed that the tissue fibers act as a reinforcement material for the plastic matrix, thereby improving the transfer process. Thus, the damage done onto the multilayer graphene film was significantly reduced similar the result reported by Martins et al (2013).…”

Section: Resultssupporting

confidence: 83%

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2017

JSM

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Section: Resultssupporting

confidence: 83%

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2017

JSM

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“…The resistances of graphene on the PDMS substrate were several times higher than the ones obtained on the SiO 2 /Si substrate due to the surface roughness of PDMS. [ 40 ] Hence, the graphene fi lms for volumes of 0.2, 0.4, and 0.6 mL injected on PDMS were not conductive. Figure 4 a shows the normalized resistance changes of the UGF as a function of applied strains for 0.8 and 1.0 mL of injected dispersions.…”

Section: Electrical Behavior Of Graphene-based Strain Sensorsmentioning

confidence: 99%

Large‐Area Ultrathin Graphene Films by Single‐Step Marangoni Self‐Assembly for Highly Sensitive Strain Sensing Application

Yang

et al. 2016

Adv Funct Materials

338

259

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1322 wileyonlinelibrary.com applications in fi elds of healthcare monitoring, human-computer interaction, and electronic skin. [ 12 ] The relative resistance Δ R normalized by the initial resistance R 0 depends on Poisson's ratio ( ν ) and resistivity variation (Δ ρ ) normalized by its initial resistivity ρ 0 through the expression ΔR / R 0 = (1 + 2ν) ε + Δ ρ / ρ 0.[ 13 ] The sensitivity revealed by gauge factor (GF, defi ned as ( ΔR / R 0 )/ ε ) depends on both intrinsic property and structural feature. According to this formula, graphene-based strain sensors have shown low sensitivities due to the rigid and stable structure of intrinsic graphene. [ 14 ] With hardly opened band gap, the GF of a suspended graphene is only about 1.9 under moderate uniaxial strains. [ 15 ] Therefore, structural engineering of graphene is needed to boost the sensitivity of graphene-based strain sensors.Adjustment of the connection channels in graphene is an effective way to alter its resistivity for improved sensitivity in strain sensors. Two common methods for the structural construction of graphene include high temperature processing based chemical vapor deposition (CVD) and solution processing based sheets/fl akes assembly. As for CVD, the resistivity of graphene would be affected by its grain boundary, grain size, and the defect density. [16][17][18] Continuous graphene fi lms grown by CVD could sustain 1% strain with a GF of only 6.1, [ 19 ] and the GF increases to 151 for a 5% strain due to the morphological Large-Area Ultrathin Graphene Films by Single-Step Marangoni Self-Assembly for Highly Sensitive Strain Sensing ApplicationXinming Li , Tingting Yang , Yao Yang , Jia Zhu , Li Li , Fakhr E. Alam , Xiao Li , Kunlin Wang , Huanyu Cheng , Cheng-Te Lin , * Ying Fang , * and Hongwei Zhu * Promoted by the demand for wearable devices, graphene has been proved to be a promising material for potential applications in fl exible and highly sensitive strain sensors. However, low sensitivity and complex processing of graphene retard the development toward the practical applications. Here, an environment-friendly and cost-effective method to fabricate large-area ultrathin graphene fi lms is proposed for highly sensitive fl exible strain sensor. The assembled graphene fi lms are derived rapidly at the liquid/air interface by Marangoni effect and the area can be scaled up. These graphene-based strain sensors exhibit extremely high sensitivity with gauge factor of 1037 at 2% strain, which represents the highest value for graphene platelets at this small deformation so far. This simple fabrication for strain sensors with highly sensitive performance of strain sensor makes it a novel approach to applications in electronic skin, wearable sensors, and health monitoring platforms.

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“…Figure 1A-C shows the transfer printing of large area chemical vapor deposited (CVD) graphene on flexible PVC substrates using a hot lamination process. [31] In this work, we used commercially available single-layer graphene CVD grown on Cu, of which the growth parameters and the characterization on rigid substrates have been previously demonstrated elsewhere. [32][33][34] We analyzed some of the properties of graphene layers on flexible PVC substrates after transfer printing.…”

Section: Graphene On Transparent Flexible Substratesmentioning

confidence: 99%

Energy‐Autonomous, Flexible, and Transparent Tactile Skin

García-Núñez

Navaraj

Polat

et al. 2017

Adv Funct Materials

270

190

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such as diabetes. To satisfy the requirements of such a system, active materials with intrinsic properties, including good mechanical, electrical, optical, and structural properties, are in high demand. [1] The development of suitable flexible pressure sensors for e-skin applications has been a challenge, due to inadequate flexibility, conductivity, large-area manufacturability, and reliable and repeatable performance of the structure, to be applicable in practical robots. [7] In this regard, only very few approaches have been successfully employed in actual robots. [7,8] Further, making the e-skin transparent adds an extra dimension in the functional design space of e-skin, as it enables incorporating photovoltaic (PV)-energy harvesting, electro/thermochromicity, chameleon effect, etc. Along with a new generation of flexible and stretchable solar cells, [9] this will allow fabrication of energy-autonomous, stretchable e-skins. Accordingly, a novel approach is explored in this work, of a vertical-layered-stack structure consisting of a photovoltaic cell attached to the back plane of a transparent tactile skin; where skin transparency is a crucial feature that allows light to pass through, making the building block unique and opening a new, promising line of energy-autonomous devices for flexible electronics. In this regard, graphene is a promising material as it offers key parameters to develop nonplanar, transparent electronic or tactile skin. It has been shown that graphene has a good combination of stiffness (≈1000 GPa) and tensile strength (≈100 GPa). [10] Together with its sunlight blindness [11] and good electrical conductivity, [12] graphene has also emerged as a viable candidate for various flexible, transparent electronic and optoelectronic devices. [13][14][15][16] Moreover, in our recent work, we demonstrated that high-quality graphene can be synthesized and transferred on large area, flexible substrates (400 cm 2 ) with a very low-cost and easy fabrication process. [15] Owing to the intrinsic properties and advances in the synthesis and fabrication of devices, graphene is also a promising candidate for the development of high-performance e-skin, requiring large area device fabrication on nonplanar surfaces.A few flexible pressure sensors reported in literature, based on capacitive, [17][18][19][20] piezoelectric, [21] and piezoresistive sensing mechanisms, [2,[22][23][24][25][26][27][28] use graphene as an active material. Piezoresistive sensors transduce the pressure imposed on the sensor's active area in terms of resistance change, and offer an attractive solution for pressure sensing due to advantages such as low cost and easy signal collection. Graphene-based piezoresistive pressure sensors have been reported in various configurations. For example, Yao et al. demonstrated the fabrication of flexible pressure sensors based on a graphene nanosheet on Energy-Autonomous, Flexible, and Transparent Tactile SkinCarlos García Núñez, William Taube Navaraj, Emre O. Polat, and Ravinder Dahiya* Tactile or el...

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Direct transfer of graphene onto flexible substrates

Cited by 177 publications

References 29 publications

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Large‐Area Ultrathin Graphene Films by Single‐Step Marangoni Self‐Assembly for Highly Sensitive Strain Sensing Application

Energy‐Autonomous, Flexible, and Transparent Tactile Skin

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