DGIST Scholar: Synthesis of a graphene-carbon nanotube composite and its electrochemical sensing of hydrogen peroxide

Department of Energy Science and Engineering ETC 1. Journal Articles

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Synthesis of a graphene-carbon nanotube composite and its electrochemical sensing of hydrogen peroxide

Title: Synthesis of a graphene-carbon nanotube composite and its electrochemical sensing of hydrogen peroxide

Author(s): Woo, Seunghee ; Kim, Yang-Rae ; Chung, Taek Dong ; Piao, Yuanzhe ; Kim, Ha Suck

Subject: Carbon Atoms ; Composite ; Composite Modified Electrodes ; Detection Limits ; Electro-Chemical Electrodes ; Electrocatalytic Reduction ; Electrochemical Properties ; Electrochemical Sensing ; Electrochemical Sensors ; Electrochemical Surface Area ; Fast Electron Transfer ; Graphene ; Hydrogen ; Hydrogen Peroxide ; Linear Dependence ; Multi-Walled ; Multiwalled Carbon Nanotube ; Multiwalled Carbon Nanotubes (MWCN) ; Nanocomposite Films ; Nanotube Composites ; Oxidation ; Redox Species ; Sensors ; Single Layer

Abstract: Graphene, whose structure consists of a single layer of sp 2-hybridized carbon atoms, provides an excellent platform for designing composite nanomaterials. In this study, we have demonstrated a facile process to synthesize graphene-multiwalled carbon nanotube (MWCNT) composite. The graphene-MWCNT composite material is endowed with a large electrochemical surface area and fast electron transfer properties in Fe(CN) 6 3-/4- redox species. A graphene-MWCNT composite modified electrode exhibits good performance in terms of the electrocatalytic reduction of H 2O 2; a sensor constructed from such an electrode shows a good linear dependence on H 2O 2 concentration in the range of 2 × 10 -5 to 2.1 × 10 -3 mol L -1. The detection limit is estimated to be 9.4 × 10 -6 mol L -1. This study provides a new kind of composite modified electrode for electrochemical sensors. © 2011 Elsevier Ltd. All Rights Reserved.