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Acetylene-sourced CVD-synthesised catalytically active graphene for electrochemical biosensing.
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, Faculty of Science & Engineering. Vanderbijlpark, South Africa.
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, Faculty of Science & Engineering.
Stockholm, Sweden.
Vanderbijlpark, South Africa.
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2016 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, no 16Article in journal (Refereed) In press
Abstract [en]

In this study, we have demonstrated the use of a graphene sheet as a fundamental building block to obtain a highly ordered graphene-enzyme electrode for electrochemical biosensing. Firstly, thin graphene sheets were deposited on 1.00 mm thick copper sheet at 850 oC, via chemical vapour deposition (CVD), using acetylene (C2H2) as carbon source in an argon (Ar) and nitrogen (N2) atmosphere. An anionic surfactant was used to introduce electrostatic charges and increase wettability and hydrophilicity on the basal plane of the otherwise hydrophobic graphene, thereby facilitating the assembly of biomolecules on the graphene surface. The bioelectrocatalytic activity of the system was investigated by the assembly of glucose oxidase (GOx) on the surface of the graphene sheet by intermolecular attractive forces. The electrochemical sensing activity of the graphene-based system was explored as a model for bioelectrocatalysis. The bioelectrode exhibited a linear response to glucose concentration from 0.2 to 9.8 mM, with sensitivity of 0.087 µA/µM/cm2 and a detection limit of 0.12 µM (S/N=3). This work sets the stage for the use of acetylene-sourced graphene sheets as fundamental building blocks in the fabrication of electrochemical biosensors and other biocatalytic devices.

Place, publisher, year, edition, pages
2016. no 16
Keyword [en]
CVD-graphene, bioelectronics, theoretical calculation, surfactant modification, 2D-materials
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-128195DOI: 10.1016/j.bios.2016.03.063PubMedID: 27157880OAI: oai:DiVA.org:liu-128195DiVA: diva2:929989
Available from: 2016-05-20 Created: 2016-05-20 Last updated: 2016-06-07

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