Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 33, Issue 8, Pages 4692-4699Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.msec.2013.07.028
Keywords
Ag@TiO2 nanocomposites; Hydrogen peroxide sensor; Nonenzymatic sensor; Glassy carbon electrode; Ag@TiO2/GCE; Differential pulse voltammetry
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012R1A1A4A01005951]
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A novel nonenzymatic sensor for H2O2 was developed based on an Ag@TiO2 nanocomposite synthesized using a simple and cost effective approach with an electrochemically active biofilm. The optical, structural, morphological and electrochemical properties of the as-prepared Ag@TiO2 nanocomposite were examined by UV-vis spectroscopy, X-ray diffraction, transmission electron microscopy and cyclic voltammetry (CV). The Ag@TiO2 nanocomposite was fabricated on a glassy carbon electrode (GCE) and their electrochemical performance was analyzed by CV, differential pulse voltammetry and electrochemical impedance spectroscopy. The Ag@TiO2 nanocomposite modified GCE (Ag@TiO2/GCE) displayed excellent performance towards H2O2 sensing at -0.73 V in the linear response range from 0.83 mu M to 43.3 mu M, within a detection limit and sensitivity of 0.83 mu M and similar to 652328 +/- 0.01 mu A mu M-1 cm(-2), respectively. In addition, Ag@TiO2/GCE exhibited good operational reproducibility and long term stability. (C) 2013 Elsevier B.V. All rights reserved.
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