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Issue 19, 2012
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Amperometric biosensor based on 3D ordered freestanding porous Pt nanowire array electrode

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Abstract

A three-dimensionally (3D) ordered freestanding porous platinum (Pt) nanowire array electrode (PPNWAE) with pores of several nanometers in size and a Pt nanowire array electrode (PNWAE) without pores were facilely fabricated by metal electrodeposition and direct integration with a Pt disk electrode. The unusual PPNWAE with high active area showed excellent sensitivity (0.36 mA cm−2 mM−1) and a wide detection range (4.5 μM–27.1 mM) to hydrogen peroxide (H2O2). A glucose oxidase (GOD)-based biosensor (PPNWAE/GOD) with a considerably wide detection range (4.5 μM–189.5 mM) to glucose was demonstrated. Furthermore, a lower detection limit, higher sensitivity and smaller value of Michaelis–Menten constant km were recorded for PPNWAE-based biosensors compared with PNWAE-based biosensors. Particularly, the response current to glucose of PPNWAE/GOD was ca. 100% higher than that of PNWAE/GOD and the response current to H2O2 of PPNWAE was ca. 50% higher than that of PNWAE, owing to the granular and rougher porous nanowire surface enabling greater bioactivity for GOD. The selectivity of PPNWAE/GOD glucose biosensor was also estimated.

Graphical abstract: Amperometric biosensor based on 3D ordered freestanding porous Pt nanowire array electrode

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Publication details

The article was received on 22 May 2012, accepted on 17 Jul 2012 and first published on 20 Jul 2012


Article type: Paper
DOI: 10.1039/C2NR31256E
Citation: Nanoscale, 2012,4, 6025-6031
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    Amperometric biosensor based on 3D ordered freestanding porous Pt nanowire array electrode

    Y. Wang, Y. Zhu, J. Chen and Y. Zeng, Nanoscale, 2012, 4, 6025
    DOI: 10.1039/C2NR31256E

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