Large area graphene and graphene oxide patterning and nanographene fabrication by one-step lithography

Climent‐Pascual, Esteban; García-Vélez, Miguel; Álvarez, Antonio García; Coya, Carmen; Munuera, Carmen; Díez-Betriu, Xavier; Garcı́a-Hernández, M.; Andrés, A. de

doi:10.1016/j.carbon.2015.04.018

Cited by 15 publications

(9 citation statements)

References 39 publications

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“…The white dashed circle at the center of the large spot represents an estimation of the tip size. Craters generated at low RH < 40% usually exhibit a brighter contrast due to the removal of graphene (as confirmed by the disappearance of the Raman signal), and appear to progress not radially but through lobes or fingers, indicating that are driven by a different mechanism . For more information about results of craters by graphene removal, see the Supporting Information.…”

Section: Resultsmentioning

confidence: 85%

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

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García-Vélez

et al. 2019

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A deep comprehension of the local anodic oxidation process in 2D materials is achieved thanks to an extensive experimental and theoretical study of this phenomenon in graphene. This requires to arrange a novel instrumental device capable to generate separated regions of monolayer graphene oxide (GO) over graphene, with any desired size, from micrometers to unprecedented mm2, in minutes, a milestone in GO monolayer production. GO regions are manufactured by overlapping lots of individual oxide spots of thousands µm2 area. The high reproducibility and circular size of the spots allows not only an exhaustive experimental characterization inside, but also establishing an original model for oxide expansion which, from classical first principles, overcomes the traditional paradigm of the water bridge, and is applicable to any 2D‐material. This tool predicts the oxidation behavior with voltage and exposure time, as well as the expected electrical current along the process. The hitherto unreported transient current is measured during oxidation, gaining insight on its components, electrochemical and transport. Just combining electrical measurements and optical imaging estimating carrier mobility and degree of oxidation is possible. X‐ray photoelectron spectroscopy reveals a graphene oxidation about 30%, somewhat lower to that obtained by Hummers' method.

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Section: Resultsmentioning

confidence: 85%

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

Quesada

Borrás

García-Vélez

et al. 2019

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“…On the surface of the passivation layer, we patterned graphene films into pixelated electrodes. Various graphene patterning methods have been proposed [18,[24][25][26]. However, the majority of these methods yield deterioration of graphene surface quality and incorrect geometric dimensions.…”

Section: Resultsmentioning

confidence: 99%

Display process compatible accurate graphene patterning for OLED applications

et al. 2017

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Graphene film can be used as transparent electrodes in display and optoelectronic applications. However, achieving residue free graphene film pixel arrays with geometrical precision on large area has been a difficult challenge. By utilizing the liquid bridging concept, we realized photolithographic patterning of graphene film with dimensional correctness and absence of surface contaminant. On a glass substrate of 100 × 100 mm2 size, we demonstrate our patterning method to fabricate an addressable two-color OLED module of which graphene film pixel size is 170 × 300 µm2. Our results strongly suggest graphene film as a serviceable component in commercial display products. The flexible and foldable display applications are expected to be main beneficiaries of our method.

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“…In order to make the hybrid conductor of Ag NW-GP with high optical and electrical properties, there has been big progress in GP mesh engineering by tailoring its pattern into predefined shapes, position, and sizes at atomic scale mainly through (i) vacuum processes of He-ion/electron beam lithography, O 2 plasma etching, nanoimprint lithography, catalytic passivation, catalytic etching and hot embossing imprinting [13][14][15][16][17][18][19][20], and (ii) non-vacuum approaches of laser-assisted transfer printing, laser ablation, micro-molding, and masking layer based mesh-patterning [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

“…First, most GP patterning approaches require complicated, low durability and expensive lithographic steps, instruments, and materials, leading to lacked scalability and low production speed of GP meshes [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Specifically, the as-mentioned patterning process for GP involves multiple steps of complicated template/mask preparation (mask lithography), lifting/stamping of patterned GP onto a substrate, photoresist (PR) developing, etching, PR/mask removal, and laser ablation [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Second, the optical interference effect (i.e., Moire phenomenon) can be observed in the display image because of a constructive and destructive interferences by regularly arrayed voids in GP mesh [34,35].…”

Section: Introductionmentioning

confidence: 99%

Novel Hybrid Conductor of Irregularly Patterned Graphene Mesh and Silver Nanowire Networks

et al. 2020

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We prepared the hybrid conductor of the Ag nanowire (NW) network and irregularly patterned graphene (GP) mesh with enhanced optical transmittance (~98.5%) and mechano-electric stability (ΔR/Ro: ~42.4% at 200,000 (200k) cycles) under 6.7% strain. Irregularly patterned GP meshes were prepared with a bottom-side etching method using chemical etchant (HNO3). The GP mesh pattern was judiciously and easily tuned by the regulation of treatment time (0–180 min) and concentration (0–20 M) of chemical etchants. As-formed hybrid conductor of Ag NW and GP mesh exhibit enhanced/controllable electrical-optical properties and mechano-electric stabilities; hybrid conductor exhibits enhanced optical transmittance (TT = 98.5%) and improved conductivity (ΔRs: 22%) compared with that of a conventional hybrid conductor at similar TT. It is also noteworthy that our hybrid conductor shows far superior mechano-electric stability (ΔR/Ro: ~42.4% at 200k cycles; TT: ~98.5%) to that of controls (Ag NW (ΔR/Ro: ~293% at 200k cycles), Ag NW-pristine GP hybrid (ΔR/Ro: ~121% at 200k cycles)) ascribed to our unique hybrid structure.

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Large area graphene and graphene oxide patterning and nanographene fabrication by one-step lithography

Cited by 15 publications

References 39 publications

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

New Concepts for Production of Scalable Single Layer Oxidized Regions by Local Anodic Oxidation of Graphene

Display process compatible accurate graphene patterning for OLED applications

Novel Hybrid Conductor of Irregularly Patterned Graphene Mesh and Silver Nanowire Networks

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