Journal
NANOSCALE
Volume 4, Issue 19, Pages 6025-6031Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2nr31256e
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Funding
- Nation Natural Science of China [51072217]
- Excellent Academic Leaders Plan of Shanghai [Y15SX81801]
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure
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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 mu M-27.1 mM) to hydrogen peroxide (H2O2). A glucose oxidase (GOD)-based biosensor (PPNWAE/GOD) with a considerably wide detection range (4.5 mu M-189.5 mM) to glucose was demonstrated. Furthermore, a lower detection limit, higher sensitivity and smaller value of Michaelis-Menten constant k(m) 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.
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