Graphene transport properties upon exposure to PMMA processing and heat treatments

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Abstract

The evolution of graphene's electrical transport properties due to processing with the polymer polymethyl methacrylate (PMMA) and heat are examined in this study. The use of stencil (shadow mask) lithography enables fabrication of graphene devices without the usage of polymers, chemicals or heat, allowing us to measure the evolution of the electrical transport properties during individual processing steps from the initial as-exfoliated to the PMMA-processed graphene. Heating generally promotes the conformation of graphene to SiO2 and is found to play a major role for the electrical properties of graphene while PMMA residues are found to be surprisingly benign. In accordance with this picture, graphene devices with initially high carrier mobility tend to suffer a decrease in carrier mobility, while in contrast an improvement is observed for low carrier mobility devices. We explain this by noting that flakes conforming poorly to the substrate will have a higher carrier mobility which will however be reduced as heat treatment enhance the conformation. We finally show the electrical properties of graphene to be reversible upon heat treatments in air up to 200°C.
Original languageEnglish
Journal2D materials
Volume1
Issue number3
Pages (from-to)035005
Number of pages11
ISSN2053-1583
DOIs
Publication statusPublished - 2014

Bibliographical note

Creative Commons Attribution 3.0 licence

Keywords

  • Graphene
  • PMMA
  • Electrical devices
  • Heat treatments

Cite this

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title = "Graphene transport properties upon exposure to PMMA processing and heat treatments",
abstract = "The evolution of graphene's electrical transport properties due to processing with the polymer polymethyl methacrylate (PMMA) and heat are examined in this study. The use of stencil (shadow mask) lithography enables fabrication of graphene devices without the usage of polymers, chemicals or heat, allowing us to measure the evolution of the electrical transport properties during individual processing steps from the initial as-exfoliated to the PMMA-processed graphene. Heating generally promotes the conformation of graphene to SiO2 and is found to play a major role for the electrical properties of graphene while PMMA residues are found to be surprisingly benign. In accordance with this picture, graphene devices with initially high carrier mobility tend to suffer a decrease in carrier mobility, while in contrast an improvement is observed for low carrier mobility devices. We explain this by noting that flakes conforming poorly to the substrate will have a higher carrier mobility which will however be reduced as heat treatment enhance the conformation. We finally show the electrical properties of graphene to be reversible upon heat treatments in air up to 200°C.",
keywords = "Graphene, PMMA, Electrical devices, Heat treatments",
author = "Lene Gammelgaard and Jose Caridad and Alberto Cagliani and David Mackenzie and Petersen, {Dirch Hjorth} and Tim Booth and Peter B{\o}ggild",
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year = "2014",
doi = "10.1088/2053-1583/1/3/035005",
language = "English",
volume = "1",
pages = "035005",
journal = "2D materials",
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Graphene transport properties upon exposure to PMMA processing and heat treatments. / Gammelgaard, Lene; Caridad, Jose; Cagliani, Alberto; Mackenzie, David; Petersen, Dirch Hjorth; Booth, Tim ; Bøggild, Peter.

In: 2D materials, Vol. 1, No. 3, 2014, p. 035005.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Graphene transport properties upon exposure to PMMA processing and heat treatments

AU - Gammelgaard, Lene

AU - Caridad, Jose

AU - Cagliani, Alberto

AU - Mackenzie, David

AU - Petersen, Dirch Hjorth

AU - Booth, Tim

AU - Bøggild, Peter

N1 - Creative Commons Attribution 3.0 licence

PY - 2014

Y1 - 2014

N2 - The evolution of graphene's electrical transport properties due to processing with the polymer polymethyl methacrylate (PMMA) and heat are examined in this study. The use of stencil (shadow mask) lithography enables fabrication of graphene devices without the usage of polymers, chemicals or heat, allowing us to measure the evolution of the electrical transport properties during individual processing steps from the initial as-exfoliated to the PMMA-processed graphene. Heating generally promotes the conformation of graphene to SiO2 and is found to play a major role for the electrical properties of graphene while PMMA residues are found to be surprisingly benign. In accordance with this picture, graphene devices with initially high carrier mobility tend to suffer a decrease in carrier mobility, while in contrast an improvement is observed for low carrier mobility devices. We explain this by noting that flakes conforming poorly to the substrate will have a higher carrier mobility which will however be reduced as heat treatment enhance the conformation. We finally show the electrical properties of graphene to be reversible upon heat treatments in air up to 200°C.

AB - The evolution of graphene's electrical transport properties due to processing with the polymer polymethyl methacrylate (PMMA) and heat are examined in this study. The use of stencil (shadow mask) lithography enables fabrication of graphene devices without the usage of polymers, chemicals or heat, allowing us to measure the evolution of the electrical transport properties during individual processing steps from the initial as-exfoliated to the PMMA-processed graphene. Heating generally promotes the conformation of graphene to SiO2 and is found to play a major role for the electrical properties of graphene while PMMA residues are found to be surprisingly benign. In accordance with this picture, graphene devices with initially high carrier mobility tend to suffer a decrease in carrier mobility, while in contrast an improvement is observed for low carrier mobility devices. We explain this by noting that flakes conforming poorly to the substrate will have a higher carrier mobility which will however be reduced as heat treatment enhance the conformation. We finally show the electrical properties of graphene to be reversible upon heat treatments in air up to 200°C.

KW - Graphene

KW - PMMA

KW - Electrical devices

KW - Heat treatments

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