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Koefoed L, Pedersen EB, Thyssen L, et al. Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry. Langmuir. 2016;32(25):6289-96doi: 10.1021/acs.langmuir.6b01309.
Koefoed, L., Pedersen, E. B., Thyssen, L., Vinther, J., Kristiansen, T., Pedersen, S. U., & Daasbjerg, K. (2016). Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry. Langmuir : the ACS journal of surfaces and colloids, 32(25), 6289-96. https://doi.org/10.1021/acs.langmuir.6b01309
Koefoed, Line, et al. "Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry." Langmuir : the ACS journal of surfaces and colloids vol. 32,25 (2016): 6289-96. doi: https://doi.org/10.1021/acs.langmuir.6b01309
Koefoed L, Pedersen EB, Thyssen L, Vinther J, Kristiansen T, Pedersen SU, Daasbjerg K. Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry. Langmuir. 2016 Jun 28;32(25):6289-96. doi: 10.1021/acs.langmuir.6b01309. Epub 2016 Jun 14. PMID: 27299175.
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Langmuir. 2016 Jun 28;32(25):6289-96. doi: 10.1021/acs.langmuir.6b01309. Epub 2016 Jun 14.

Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry.

Langmuir : the ACS journal of surfaces and colloids

Line Koefoed, Emil Bjerglund Pedersen, Lena Thyssen, Jesper Vinther, Thomas Kristiansen, Steen U Pedersen, Kim Daasbjerg

Affiliations

  1. Department of Chemistry, Aarhus University , Langelandsgade 140, 8000 Aarhus C, Denmark.
  2. Interdisciplinary Nanoscience Center (iNANO), Aarhus University , Gustav Wieds Vej 14, 8000 Aarhus C, Denmark.
  3. Carbon Dioxide Activation Center, Aarhus University , Gustav Wieds Vej 14, 8000 Aarhus C, Denmark.

PMID: 27299175 DOI: 10.1021/acs.langmuir.6b01309

Abstract

Development of versatile methods for graphene functionalization is necessary before use in applications such as composites or as catalyst support. In this study, bipolar electrochemistry is used as a wireless functionalization method to graft 4-bromobenzenediazonium on large (10 × 10 mm(2)) monolayer graphene sheets supported on SiO2. Using this technique, transferred graphene can be electrochemically functionalized without the need of a metal support or the deposition of physical contacts. X-ray photoelectron spectroscopy and Raman spectroscopy are used to map the chemical changes and modifications of graphene across the individual sheets. Interestingly, the defect density is similar between samples, independent of driving potential, whereas the grafting density is increased upon increasing the driving potential. It is observed that the 2D nature of the electrode influences the electrochemistry and stability of the electrode compared to conventional electrografting using a three-electrode setup. On one side, the graphene will be blocked by the attached organic film, but the conductivity is also altered upon functionalization, which makes the graphene electrode different from a normal metal electrode. Furthermore, it is shown that it is possible to simultaneously modify an array of many small graphene electrodes (1 × 1 mm(2)) on SiO2.

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