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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0583.xml
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|a (DE-627)NLM174738331
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|a (NLM)17973504
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Huang, Yu-Fen
|e verfasserin
|4 aut
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|a Control of the surface charges of Au-Ag nanorods
|b selective detection of iron in the presence of poly(sodium 4-styrenesulfonate)
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|c 2007
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|a Text
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|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
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|2 rdamedia
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|2 rdacarrier
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|a Date Completed 08.01.2008
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|a Date Revised 27.11.2007
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a 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 CTAB-Au-Ag NRs exhibit an intense longitudinal surface plasmon resonance absorption (>10(9) 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 zeta 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 agglomeration-and, thus, the change in absorption at 827 nm-is 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 x 10(-6))% PSS, pH 7.2], the limit of detection for Fe2+ ions at a signal-to-noise ratio of 3 was 1.0 microM. 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%)
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|a Journal Article
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|a Lin, Yang-Wei
|e verfasserin
|4 aut
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|a Chang, Huan-Tsung
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 23(2007), 25 vom: 04. Dez., Seite 12777-81
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:23
|g year:2007
|g number:25
|g day:04
|g month:12
|g pages:12777-81
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|d 23
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|h 12777-81
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