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Issue 23, 2017
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Visual and optical detection of hypochlorite in water samples based on etching of gold/silver alloy nanoparticles

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Abstract

In this work, we have described a cost-effective, simple, selective and sensitive approach for the detection of hypochlorite (ClO) using gold/silver alloy nanoparticles (Au/Ag alloy NPs) as a colorimetric probe. The synthesized Au/Ag alloy NPs were characterized by UV-Vis absorption, zeta potential and high-resolution transmission electron microscopy (HR-TEM) measurements. Formation of homogeneous alloy NPs was evidenced from a single surface plasmon resonance (SPR) band at 410 nm in absorption spectral measurements. Upon the successive addition of ClO, the absorption intensity of Au/Ag alloy NPs showed a drastic decrease accompanied by a significant red shift from 410 nm to 522 nm along with a notable change in color from yellow to purple. These observed color and spectral changes are due to the strong oxidizing nature and etching effect of ClO on the surface of the Au/Ag alloy NPs. The present sensing method was able to identify ClO from other interfering anions and cations with a limit of detection of 0.30 × 10−6 mol dm−3 (S/N = 3) in the linear range from 2.40 to 24.00 × 10−6 mol dm−3. The assay was successfully utilized for sensing of ClO in tap water samples.

Graphical abstract: Visual and optical detection of hypochlorite in water samples based on etching of gold/silver alloy nanoparticles

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Publication details

The article was received on 22 Jul 2017, accepted on 27 Sep 2017 and first published on 27 Sep 2017


Article type: Paper
DOI: 10.1039/C7NJ02682J
Citation: New J. Chem., 2017,41, 14130-14136
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    Visual and optical detection of hypochlorite in water samples based on etching of gold/silver alloy nanoparticles

    K. Shanmugaraj and M. Ilanchelian, New J. Chem., 2017, 41, 14130
    DOI: 10.1039/C7NJ02682J

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