Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 78: Graphene: Spintronics, Transistors, and Sensors (HL jointly with DY, MA, O, TT)
O 78.7: Vortrag
Donnerstag, 3. April 2014, 16:45–17:00, POT 081
Development of an amperometric H2O2 sensor based on graphene — •Masoumeh Sisakhti1, Alexander Zöpfl2, Jonathan Eroms1, Thomas Hirsch2, and Christoph Strunk1 — 1Institut für Experimentelle und Angewandte Physik,Universität Regensburg — 2Institut für analytische Chemie,Universität Regensburg
The precise detection of Hydrogen peroxide (H2O2) has been a widely researched topic and the focus of a vast amount of attention, owing to its vital role in biological systems, as well as its utility in food, pharmaceutical and biochemical industries.
The objective of this work is to investigate a novel nonenzymatic, amperometric sensor for reliable determination of H2O2 based on graphene.
We produced graphene sensors based on three types of graphene: exfoliated graphene, CVD grown graphene and reduced graphene oxide and carried out cyclic voltammetry and amperometric experiments using a CH Instrument electrochemical analyzer. We demonstrate that all three graphene materials show excellent sensitivity to the catalytic reduction of H2O2 and are able to detect H2O2 concentrations down to 0.1 mM. rGO as well as graphene prepared by CVD are promising candidates for sensor applications since they are able to detect hydrogen peroxide with high sensitivity at moderate electrode potentials. Both materials are superior in the signal-to-noise ratio compared to exfoliated graphene. A further conjugation of enzymes to the defects within the carbon nano material as well as the assembly of 2D-layered composite materials will be perspective to biosensor applications.