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Issue 34, 2010
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Electrochemical determination of L-Cysteine by an elbow shaped, Sb-doped ZnO nanowire-modified electrode

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Abstract

Elbow shaped Sb-doped ZnO nanowires (SZO NWs) have been synthesized via thermal evaporation and thoroughly characterized. A glassy carbon (GC) electrode was modified by these NWs for the determination of L-cystein (L-CySH). Detailed electrochemical measurements of the modified electrode towards L- CySH oxidation are investigated. The response current of L-CySH oxidation at the SZO/GC electrode is found to be much higher than that of the bare GC and ZnO/GC electrodes. This change in the electrochemical properties of the modified electrode is due to the reduction in band gap and an increased amount of deep-level defects in SZO NWs, which leads to a significant role in the L-CySH determination. The modified electrode exhibits a reproducible sensitivity of 400 nA μM−1, within a response time of less than 6s, a detection limit of 0.025 μM and a linear range of 0.075 to 100 μM. Furthermore, the modified electrode shows high stability and good resistance to interference. Our investigation demonstrates that SZO NWs are very sensitive to L-CySH and can be employed in the development of biosensors for future biological and medical applications.

Graphical abstract: Electrochemical determination of l-Cysteine by an elbow shaped, Sb-doped ZnO nanowire-modified electrode

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Publication details

The article was received on 15 Apr 2010, accepted on 06 May 2010 and first published on 28 Jul 2010


Article type: Paper
DOI: 10.1039/C0JM01055C
Citation: J. Mater. Chem., 2010,20, 7169-7174
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    Electrochemical determination of L-Cysteine by an elbow shaped, Sb-doped ZnO nanowire-modified electrode

    M. Ahmad, C. Pan and J. Zhu, J. Mater. Chem., 2010, 20, 7169
    DOI: 10.1039/C0JM01055C

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