Control of the surface charges of Au-Ag nanorods: Selective detection of iron in the presence of poly(sodium 4-styrenesulfonate)

Yu Fen Huango, Yang Wei Lin, Huan Tsung Chang

Research output: Contribution to journalArticle

25 Citations (Scopus)

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 CTAB-Au-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 £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 × 10-6)% PSS, pH 7.2], the limit of detection for Fe2+ ions at a signal-to-noise ratio of 3 was 1.0μM. 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%).

Original languageEnglish
Pages (from-to)12777-12781
Number of pages5
JournalLangmuir
Volume23
Issue number25
DOIs
Publication statusPublished - 2007 Dec 4

Fingerprint

Surface charge
Nanorods
nanorods
Iron
Sodium
sodium
iron
Ions
agglomeration
ions
Agglomeration
selectivity
Nanosensors
ascorbic acid
Ascorbic acid
Surface plasmon resonance
Coulomb interactions
cetrimonium
styrenesulfonic acid polymer
Charge density

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

Cite this

@article{ebac95db025b4eeab310ac0117557cc3,
title = "Control of the surface charges of Au-Ag nanorods: Selective detection of iron in the presence of poly(sodium 4-styrenesulfonate)",
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 CTAB-Au-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 £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 × 10-6){\%} PSS, pH 7.2], the limit of detection for Fe2+ ions at a signal-to-noise ratio of 3 was 1.0μM. 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{\%}).",
author = "Huango, {Yu Fen} and Lin, {Yang Wei} and Chang, {Huan Tsung}",
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Control of the surface charges of Au-Ag nanorods : Selective detection of iron in the presence of poly(sodium 4-styrenesulfonate). / Huango, Yu Fen; Lin, Yang Wei; Chang, Huan Tsung.

In: Langmuir, Vol. 23, No. 25, 04.12.2007, p. 12777-12781.

Research output: Contribution to journalArticle

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T1 - Control of the surface charges of Au-Ag nanorods

T2 - Selective detection of iron in the presence of poly(sodium 4-styrenesulfonate)

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