Novel Ag@TiO2 nanocomposite synthesized by electrochemically active biofilm for nonenzymatic hydrogen peroxide sensor

Mater Sci Eng C Mater Biol Appl. 2013 Dec 1;33(8):4692-9. doi: 10.1016/j.msec.2013.07.028. Epub 2013 Jul 26.

Abstract

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 μM to 43.3 μM, within a detection limit and sensitivity of 0.83 μM and ~65.2328±0.01 μA μM(-1) cm(-2), respectively. In addition, Ag@TiO2/GCE exhibited good operational reproducibility and long term stability.

Keywords: Ag@TiO(2) nanocomposites; Ag@TiO(2)/GCE; Differential pulse voltammetry; Glassy carbon electrode; Hydrogen peroxide sensor; Nonenzymatic sensor.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Carbon / chemistry
  • Dielectric Spectroscopy
  • Electrochemical Techniques*
  • Electrodes
  • Hydrogen Peroxide / analysis*
  • Nanocomposites / chemistry*
  • Nanocomposites / ultrastructure
  • Silver / chemistry*
  • Titanium / chemistry*

Substances

  • titanium dioxide
  • Silver
  • Carbon
  • Hydrogen Peroxide
  • Titanium