Hydrogen peroxide biosensor based on electrodeposition of zinc oxide nanoflowers onto carbon nanotubes film electrode

A new amperometric biosensor for hydrogen peroxide was developed based on adsorption of horseradish peroxidase at the glassy carbon electrode modified with zinc oxide nanoflowers produced by electrodeposition onto multi-walled carbon nanotubes (MWNTs) film. The morphology of the MWNTs/nano-ZnO electrode has been investigated by scanning electron microscopy (SEM), and the electrochemical performance of the electrode has also been studied by amperometric method. The resulting electrode offered an excellent detection for hydrogen peroxide at -0.11 V with a linear response range of 9.9 X 10(-7) to 2.9 x 10(-3) mol/L with a correlation coefficient of 0.991, and response time < 5 s. The biosensor displays rapid response and expanded linear response range, and excellent stability. (c) 2007 Yun Hui Yang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.