Journal of Applied Electrochemistry

, Volume 40, Issue 12, pp 2099–2105

Amperometric hydrogen peroxide biosensor based on a modified gold electrode with silver nanowires

Original Paper

DOI: 10.1007/s10800-010-0191-x

Cite this article as:
Song, M., Hwang, S.W. & Whang, D. J Appl Electrochem (2010) 40: 2099. doi:10.1007/s10800-010-0191-x

Abstract

A novel amperometric biosensor for the detection of hydrogen peroxide (H2O2) was prepared by immobilizing horseradish peroxidase (HRP) on highly dense silver nanowire (Ag-NW) film. The modified electrode was characterized using UV–Vis spectroscopy, scanning electron microscopy, X-ray diffraction, and transmission electron microscopy. The electrochemical performances of the electrode were studied by cyclic voltammetry and chronoamperometry. The HRPs immobilized on the surface of Ag-NWs exhibited an excellent electrocatalytic response toward reduction of H2O2. The resulting Ag-NW modified sensor showed a sensitivity of ~2.55 μA μM−1 (correlation coefficient r = 0.9969) with a linear range of 4.8 nM–0.31 μM. Its detection limit was 1.2 nM with a signal-to-noise ratio of 3. The Michaelis–Menten constant KMapp and the maximum current density Imax of the modified electrode were 0.0071 mM and 8.475 μA, respectively. The preparation process of the proposed biosensor was convenient, and the resulting biosensor showed high sensitivity, low detection limit and good stability.

Keywords

Electrochemical sensorHydrogen peroxideHorseradish peroxidaseSilver nanowiresSelf-assembled monolayers

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.Research Center for Time-domain Nano-functional DevicesKorea UniversitySeoulKorea
  2. 2.School of Electrical EngineeringKorea UniversitySeoulKorea
  3. 3.SKKU Advanced Institute of NanotechnologySungkyunkwan UniversitySuwonKorea
  4. 4.School of Advanced Materials Science & EngineeringSungkyunkwan UniversitySuwonKorea