Metal-Etching-Free Direct Delamination and Transfer of Single-Layer Graphene with a High Degree of Freedom

Yang, Sang Yoon; Oh, Joong Gun; Jung, Dong Yun; Choi, Hyung Do; Yu, Chengtao; Shin, Jisoo; Choi, Choon-Gi; Cho, Byung Jin; Choi, Sung‐Yool

doi:10.1002/smll.201401196

Cited by 59 publications

(48 citation statements)

References 32 publications

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“…But in nano‐ or micro‐particle trace form (such as what can be expected to be found as a result of graphene film transfer) it can be proinflammatory and cytotoxic . To limit this issue, the use of a dry transfer protocol for CVD graphene films utilizing the comparably benign poly vinyl alcohol (PVA) rather than PMMA could be favored.…”

Section: General Considerations For the Biocompatibility Of Graphene‐mentioning

confidence: 99%

Biocompatibility Considerations in the Design of Graphene Biomedical Materials

Bullock

Bussy

2019

Adv Materials Inter

100

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Graphene‐based materials (GBM) have outstanding properties that have proven highly beneficial in several proof‐of‐concept investigations on their biomedical potential. They can be used as suspensions of nanosheets for nanomedicine purposes as well as components of macroscale products in medical devices or tissue engineering/regenerative medicine products. However, the clinical translation of these preclinical concepts is hampered by the incomplete understanding of the biocompatibility of GBM in general, and the limited or lack of safety considerations in most preclinical proof‐of‐concept studies. In this review, the main safety aspects to be considered for the design of biocompatible materials based on GBM that interface with the human body or its fluids are outlined. Guidance to overcome some of the unique challenges presented by graphene biomedical materials are provided, stressing the need to consider safety challenges as early as possible in the design phase of the candidate biomedical product to raise its chance for clinical translation.

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Section: General Considerations For the Biocompatibility Of Graphene‐mentioning

confidence: 99%

Biocompatibility Considerations in the Design of Graphene Biomedical Materials

Bullock

Bussy

2019

Adv Materials Inter

100

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“…[5,6] Furthermore, the recovery of dissolved catalyst or disposal has consequences for the cost and environmental impact of such processes. Transfer of 2D materials has also been achieved by a variety of techniques that do not require destruction of the catalyst, including mechanical peeling, [7][8][9] electrochemical delamination by hydrogen evolution, [10][11][12][13] interfacial oxidation, [14] and a range of intercalation based techniques. [15][16][17][18] The common element between all of these transfer methods is the requirement to decouple graphene from the catalyst layer without the introduction of mechanical damage or contamination.…”

Section: Introductionmentioning

confidence: 99%

Raman spectral indicators of catalyst decoupling for transfer of CVD grown 2D materials

Whelan

Jessen

Wang

et al. 2017

Carbon

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Through a combination of monitoring the Raman spectral characteristics of 2D materials grown on copper catalyst layers, and wafer scale automated detection of the fraction of transferred material, we reproducibly achieve transfers with over 97.5% monolayer hexagonal boron nitride and 99.7% monolayer graphene coverage, for up to 300 mm diameter wafers. We find a strong correlation between the transfer coverage obtained for graphene and the emergence of a lower wavenumber 2Dpeak component, with the concurrent disappearance of the higher wavenumber 2D + peak component during oxidation of the catalyst surface. The 2D peak characteristics can therefore act as an unambiguous predictor of the success of the transfer. The combined monitoring and transfer process presented here is highly scalable and amenable for roll-to-roll processing.

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“…The fabrication process is the same as for the structure with the MLG spacer except the graphene transfer method. For the SLG, we use the dry transfer process previously reported by our group, because the SLG cannot be transferred in a large area without a supporting layer such as PMMA . Such a method has an advantage of avoiding an accidental dissolution of the PS substrate when the PMMA is dissolved by using an organic solvent such as acetone.…”

Section: Resultsmentioning

confidence: 99%

Multilayer Graphene with a Rippled Structure as a Spacer for Improving Plasmonic Coupling

Lee

Kim

Jang

et al. 2016

Adv Funct Materials

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The plasmonic coupling, the enhanced electromagnetic field occurring through a uniform and small separation between metallic particles, is required for better application to localized surface plasmon resonance. Graphene has been studied as a good spacer candidate because of its precise controllability at subnanoscale. Here, the enhancement of plasmonic coupling among metallic nanoparticles (NPs) uniformly spread out on both sides of a graphene spacer is experimentally and simulatively investigated. Additionally, the post‐evaporated flat structure is rippled along one direction to reduce the separation between nanoparticles. As the amount of rippling increases, the enhancement factor (EF) of the plasmonic coupling increases almost linearly or quadratically depending on the size of nanoparticles. Such a highly rippled nanostructure is believed to not only increase the plasmonic coupling in either side of the spacer but lead to a higher density of “hot spots” through the spacer gap also. The observed EFs of a structure with the MLG spacer are consistent with the simulation results obtained from the classical electrodynamics. On the other hand, the SLG case appears to be inconsistent with such a classical approach, indicating that the plasmon tunneling through the thin barrier is prevalent in the case of the SLG spacer.

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Metal-Etching-Free Direct Delamination and Transfer of Single-Layer Graphene with a High Degree of Freedom

Cited by 59 publications

References 32 publications

Biocompatibility Considerations in the Design of Graphene Biomedical Materials

Biocompatibility Considerations in the Design of Graphene Biomedical Materials

Raman spectral indicators of catalyst decoupling for transfer of CVD grown 2D materials

Multilayer Graphene with a Rippled Structure as a Spacer for Improving Plasmonic Coupling

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