Nano Research

, Volume 8, Issue 5, pp 1698–1709

Functionalized CVD monolayer graphene for label-free impedimetric biosensing

  • Shimaa Eissa
  • Gaston Contreras Jimenez
  • Farzaneh Mahvash
  • Abdeladim Guermoune
  • Chaker Tlili
  • Thomas Szkopek
  • Mohammed Zourob
  • Mohamed Siaj
Research Article

Abstract

Recent advances in large area graphene growth have led to many applications in different areas. In the present study, chemical vapor deposited (CVD) monolayer graphene supported on glass substrate was examined as electrode material for electrochemical biosensing applications. We report a facile strategy for covalent functionalization of CVD monolayer graphene by electrochemical reduction of carboxyphenyl diazonium salt prepared in situ in acidic aqueous solution. The carboxyphenyl-modified graphene is characterized using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM), as well as electrochemical impedance spectroscopy (EIS). We also show that the number of grafted carboxyphenyl groups on the graphene surface can be controlled by the number of cyclic voltammetry (CV) scans used for electrografting. We further present the fabrication and characterization of an immunosensor based on immobilization of ovalbumin antibody on the graphene surface after the activation of the grafted carboxylic groups via EDC/NHS chemistry. The binding between the surface-immobilized antibodies and ovalbumin was then monitored using Faradaic EIS in [Fe(CN)6]3−/4− solution. The percentage change of charge transfer resistance (Rct) after binding exhibited a linear dependence for ovalbumin concentrations ranging from 1.0 pg·mL−1 to 100 ng·mL−1, with a detection limit of 0.9 pg·mL−1. Our results indicate good sensitivity of the developed functionalized CVD graphene platform, paving the way for using CVD monolayer graphene in a variety of electrochemical biosensing devices.

Keywords

CVD grapheme electrochemical impedance spectroscopy Biosensor diazonium functionalization 

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Supplementary material

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Shimaa Eissa
    • 1
    • 2
  • Gaston Contreras Jimenez
    • 2
  • Farzaneh Mahvash
    • 2
    • 3
  • Abdeladim Guermoune
    • 2
  • Chaker Tlili
    • 1
  • Thomas Szkopek
    • 3
  • Mohammed Zourob
    • 4
  • Mohamed Siaj
    • 2
  1. 1.Institut national de la recherche scientifiqueCentre — Energie, Matériaux et TélécommunicationsVarennesCanada
  2. 2.Département de Chimie et BiochimieUniversité du Québec à MontréalMontréalCanada
  3. 3.Dept. of Electrical and Computer EngineeringMcGill UniversityMontréalCanada
  4. 4.Cranfield Health, Vincent BuildingCranfield UniversityCranfield, BedfordshireUK

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