A Novel Hydrogen Peroxide Sensor Based on Silver Nanoparticles Electrodeposited on PFS-DNA Networks Modified Glassy Carbon Electrode

Z.F. He, Y.H. Song, L. Wang*, L.L. Wan, H.Z. Zhu and S. Gao

College of Chemistry and Chemical Engineering, Jiangxi Normal University, 99 Ziyang Road, Nanchang 330022, P.R. China

*Corresponding author: Tel/Fax: +86 791 8120861; E-mail: lwangsy2003@hotmail.com

Abstract

A novel hydrogen peroxide (H2O2) sensor based on the silver nanoparticles (Ag NPs) electrodeposited on a poly(ferrocenylsilane) (PFS)-DNA networks modified glassy carbon electrode (GCE) was successfully constructed. The electrochemical experiments showed that this Ag NPs/PFS-DNA/ GCE had a good catalytic ability toward the reduction of H2O2. The effects of PFS-DNA layers, electrodeposition time for silver nanoparticles formation and the pH of the electrolyte solution on the electrocatalytic reduction of H2O2 were investigated. Under the optimal conditions, the sensor exhibited a linear range of 2.0 μM to 35.3 mM with the detection limit of 0.6 μM. A rapid response of the sensor could achieve 95 % of the steady-state current in less than 2 s. This sensor with a high selectivity and sensitivity was expected to use for practical applications in detecting H2O2.

Keywords

Sensor, DNA, Poly(ferrocenylsilane), Silver nanoparticles, Peroxide hydrogen.

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  • Asian J. Chem. /
  •  2012 /
  •  24(9) /
  •  pp 3837-3841