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Sensor for lead(II) ion based on a glassy carbon electrode modified with double-stranded DNA and ferric oxide nanoparticles |
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| Authors: | Panpan Dai Zhousheng Yang |
| Affiliation: | 1. Anhui Key Laboratory of Chemo-Biosening, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, 241000, People’s Republic of China |
| Abstract: | Shuttle-like Fe2O3 nanoparticles (NPs) were prepared by microwave-assisted synthesis and characterized by scanning electron microscopy and X-ray diffraction. The NPs were immobilized on a glassy carbon electrode and then covered with dsDNA. The resulting electrode gives a pair of well-defined redox peaks for Pb(II) at pH 6.0, with anodic and cathodic peak potentials occurring at ?0.50?V and ?0.75?V (vs. Ag/AgCl), respectively. The amperometric response to Pb(II) is linear in the range from 0.12 to 40?nM, and the detection limit is 0.1?nM at a signal-to-noise ratio of 3. The sensor exhibits high selectivity and reproducibility. A fast and sensitive Pb(II) electrochemical sensor has been fabricated by dropping Fe2O3 NPs and double-strand DNA onto the pretreated glassy carbon electrode. The sensor had high sensitivety, high sensitivity, ease of construction and utilization for Pb(II) determination. |
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