High-quality graphene flakes exfoliated on a flat hydrophobic polymer

Paolo Pedrinazzi, José M. Caridad, David M. A. Mackenzie, Filippo Pizzocchero, Lene Gammelgaard, Bjarke S. Jessen, Roman Sordan, Timothy J. Booth, Peter Bøggild*

*Corresponding author for this work

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Abstract

We show that graphene supported on a hydrophobic and flat polymer surface results in flakes with extremely low doping and strain as assessed by their Raman spectroscopic characteristics. We exemplify this technique by micromechanical exfoliation of graphene on flat poly(methylmethacrylate) layers and demonstrate Raman peak intensity ratios I(2D)/I(G) approaching 10, similar to pristine freestanding graphene. We verify that these features are not an artifact of optical interference effects occurring at the substrate: they are similarly observed when varying the substrate thickness and are maintained when the environment of the graphene flake is completely changed, by encapsulating preselected flakes between hexagonal boron nitride layers. The exfoliation of clean, pristine graphene layers directly on flat polymer substrates enables high performance, supported, and non-encapsulated graphene devices for flexible and transparent optoelectronic studies. We additionally show that the access to a clean and supported graphene source leads to high-quality van der Waals heterostructures and devices with reproducible carrier mobilities exceeding 50 000 cm2 V−1 s−1 at room temperature.
Original languageEnglish
Article number033101
JournalApplied Physics Letters
Volume112
Issue number3
Number of pages5
ISSN0003-6951
DOIs
Publication statusPublished - 2018

Cite this

Pedrinazzi, Paolo ; Caridad, José M. ; Mackenzie, David M. A. ; Pizzocchero, Filippo ; Gammelgaard, Lene ; Jessen, Bjarke S. ; Sordan, Roman ; Booth, Timothy J. ; Bøggild, Peter. / High-quality graphene flakes exfoliated on a flat hydrophobic polymer. In: Applied Physics Letters. 2018 ; Vol. 112, No. 3.
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title = "High-quality graphene flakes exfoliated on a flat hydrophobic polymer",
abstract = "We show that graphene supported on a hydrophobic and flat polymer surface results in flakes with extremely low doping and strain as assessed by their Raman spectroscopic characteristics. We exemplify this technique by micromechanical exfoliation of graphene on flat poly(methylmethacrylate) layers and demonstrate Raman peak intensity ratios I(2D)/I(G) approaching 10, similar to pristine freestanding graphene. We verify that these features are not an artifact of optical interference effects occurring at the substrate: they are similarly observed when varying the substrate thickness and are maintained when the environment of the graphene flake is completely changed, by encapsulating preselected flakes between hexagonal boron nitride layers. The exfoliation of clean, pristine graphene layers directly on flat polymer substrates enables high performance, supported, and non-encapsulated graphene devices for flexible and transparent optoelectronic studies. We additionally show that the access to a clean and supported graphene source leads to high-quality van der Waals heterostructures and devices with reproducible carrier mobilities exceeding 50 000 cm2 V−1 s−1 at room temperature.",
author = "Paolo Pedrinazzi and Caridad, {José M.} and Mackenzie, {David M. A.} and Filippo Pizzocchero and Lene Gammelgaard and Jessen, {Bjarke S.} and Roman Sordan and Booth, {Timothy J.} and Peter B{\o}ggild",
year = "2018",
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journal = "Applied Physics Letters",
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High-quality graphene flakes exfoliated on a flat hydrophobic polymer. / Pedrinazzi, Paolo; Caridad, José M.; Mackenzie, David M. A.; Pizzocchero, Filippo; Gammelgaard, Lene; Jessen, Bjarke S.; Sordan, Roman; Booth, Timothy J.; Bøggild, Peter.

In: Applied Physics Letters, Vol. 112, No. 3, 033101 , 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

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AU - Pedrinazzi, Paolo

AU - Caridad, José M.

AU - Mackenzie, David M. A.

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AU - Jessen, Bjarke S.

AU - Sordan, Roman

AU - Booth, Timothy J.

AU - Bøggild, Peter

PY - 2018

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N2 - We show that graphene supported on a hydrophobic and flat polymer surface results in flakes with extremely low doping and strain as assessed by their Raman spectroscopic characteristics. We exemplify this technique by micromechanical exfoliation of graphene on flat poly(methylmethacrylate) layers and demonstrate Raman peak intensity ratios I(2D)/I(G) approaching 10, similar to pristine freestanding graphene. We verify that these features are not an artifact of optical interference effects occurring at the substrate: they are similarly observed when varying the substrate thickness and are maintained when the environment of the graphene flake is completely changed, by encapsulating preselected flakes between hexagonal boron nitride layers. The exfoliation of clean, pristine graphene layers directly on flat polymer substrates enables high performance, supported, and non-encapsulated graphene devices for flexible and transparent optoelectronic studies. We additionally show that the access to a clean and supported graphene source leads to high-quality van der Waals heterostructures and devices with reproducible carrier mobilities exceeding 50 000 cm2 V−1 s−1 at room temperature.

AB - We show that graphene supported on a hydrophobic and flat polymer surface results in flakes with extremely low doping and strain as assessed by their Raman spectroscopic characteristics. We exemplify this technique by micromechanical exfoliation of graphene on flat poly(methylmethacrylate) layers and demonstrate Raman peak intensity ratios I(2D)/I(G) approaching 10, similar to pristine freestanding graphene. We verify that these features are not an artifact of optical interference effects occurring at the substrate: they are similarly observed when varying the substrate thickness and are maintained when the environment of the graphene flake is completely changed, by encapsulating preselected flakes between hexagonal boron nitride layers. The exfoliation of clean, pristine graphene layers directly on flat polymer substrates enables high performance, supported, and non-encapsulated graphene devices for flexible and transparent optoelectronic studies. We additionally show that the access to a clean and supported graphene source leads to high-quality van der Waals heterostructures and devices with reproducible carrier mobilities exceeding 50 000 cm2 V−1 s−1 at room temperature.

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