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Issue 4, 2014
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Sensitive and selective colorimetric sensing of Fe3+ ion by using p-amino salicylic acid dithiocarbamate functionalized gold nanoparticles

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Abstract

We have developed a selective and sensitive colorimetric method for determination of Fe3+ ion by using p-amino salicylic acid dithiocarbamate functionalized gold nanoparticles (DTC-PAS-Au NPs) as colorimetric probes. The DTC-PAS-Au NPs were characterized by FT-IR, 1H NMR, UV-visible spectrometry, transmission electron microscopy (TEM), dynamic light scattering (DLS) and atomic force microscopic (AFM) techniques, respectively. The DTC-PAS-Au NPs are aggregated rapidly by addition of Fe3+ ions, yielding a color change from red to blue. The characteristic surface plasmon resonance (SPR) peak (520 nm) of DTC-PAS-Au NPs was shifted to longer wavelength, 700 nm, which confirms the ligand-to-metal charge transfer between DTC-PAS-Au NPs and Fe3+ ions. Under the optimal conditions, a good linear relationship (correlation coefficient R2 = 0.993) was obtained between the ratio of the extinction at 700 nm to that at 520 nm and the concentration of Fe3+ over the range of 40–80 μM, with a detection limit of 14.82 nM. The DTC-PAS-Au NPs acted as colorimetric sensors for the selective detection of Fe3+ ions in real samples (blood and urine samples).

Graphical abstract: Sensitive and selective colorimetric sensing of Fe3+ ion by using p-amino salicylic acid dithiocarbamate functionalized gold nanoparticles

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Publication details

The article was received on 23 Nov 2013, accepted on 07 Dec 2013 and first published on 13 Dec 2013


Article type: Paper
DOI: 10.1039/C3NJ01468A
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Citation: New J. Chem., 2014,38, 1503-1511

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    Sensitive and selective colorimetric sensing of Fe3+ ion by using p-amino salicylic acid dithiocarbamate functionalized gold nanoparticles

    V. N. Mehta, S. K. Kailasa and H. Wu, New J. Chem., 2014, 38, 1503
    DOI: 10.1039/C3NJ01468A

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