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| Title: | Control of the Surface Charges of Au–Ag Nanorods: Selective Detection of Iron in the Presence of Poly(sodium 4-styrenesulfonate) |
| Authors: | Huang, Y.-F.;Lin, Y.-W.;Chang, H.-T. |
| Contributors: | 化學系 |
| Date: | 2007
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| Issue Date: | 2010-11-10T06:44:32Z
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| Abstract: | In this article, we report a simple approach for selectively sensing Fe2+ ions using CTAB-stabilized Au-Ag nanorods (CTAB-Au-Ag NRs) in the presence of poly(sodium 4-styrenesulfonate) (PSS). The prepared CTABAu-
Ag NRs exhibit an intense longitudinal surface plasmon resonance absorption (>109 M-1 cm-1 at 827 nm) in the near-infrared region. As a result of attractive electrostatic interactions between PSS and CTAB, agglomeration of the CTAB-Au-Ag NRs induces a change in the absorption at 827 nm. From ú potential measurements, we found that the degree of agglomeration was highly dependent on the surface charge density of the CTAB-Au-Ag NRs. Because Fe2+ (Fe3+) ions selectively interact with PSS, the degree of agglomerationsand, thus, the change in absorption at 827 nmsis dependent on the concentration of Fe2+ (Fe3+) ions. To improve the selectivity of the present sensing system, Fe3+ ions were reduced to Fe2+ ions in the presence of ascorbic acid prior to analysis. The concentrations of CTAB-Au-Ag NRs and PSS are both important parameters in determining the sensitivity and selectivity of the present approach toward sensing Fe2+ ions. Under the optimum conditions [34 pM CTAB-Au-Ag NRs, (5 10-6)% PSS, pH 7.2], the limit of detection for Fe2+ ions at a signal-to-noise ratio of 3 was 1.0 íM. We applied this nanosensor
system to the determination of Fe2+ in ferritin and in aqueous environmental samples; this approach has the advantages of simplicity, accuracy, and precision (the relative standard deviation from five runs with each sample was below 3%). |
| Relation: | Langmuir, 23, 12777-12781 |
| Appears in Collections: | [化學系] 期刊論文
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