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

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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 K appM and the maximum current density I max 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.

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Acknowledgments

This work was supported by Creative Research Initiatives (Research Center for Time-domain Nano-functional Devices, R16-2007-007-01001-0(2010)) of MEST/KOSEF and by the second stage of the Brain Korea 21 Project in 2010. D.W. acknowledges the support by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0015035).

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Authors and Affiliations

  1. Research Center for Time-domain Nano-functional Devices, Korea University, Seoul, 136-701, Korea

    Min-Jung Song, Sung Woo Hwang & Dongmok Whang

  2. School of Electrical Engineering, Korea University, Seoul, 136-701, Korea

    Min-Jung Song & Sung Woo Hwang

  3. SKKU Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon, 440-746, Korea

    Dongmok Whang

  4. School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon, 440-746, Korea

    Dongmok Whang

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  1. Min-Jung Song
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  2. Sung Woo Hwang
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Correspondence to Sung Woo Hwang or Dongmok Whang.

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Song, MJ., Hwang, S.W. & Whang, D. Amperometric hydrogen peroxide biosensor based on a modified gold electrode with silver nanowires. J Appl Electrochem 40, 2099–2105 (2010). https://doi.org/10.1007/s10800-010-0191-x

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  • DOI: https://doi.org/10.1007/s10800-010-0191-x

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