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Issue 10, 2012
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Multifunctional modified silver nanoparticles as ion and pH sensors in aqueous solution

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Abstract

Silver nanoparticles capped with mercaptoacetic acid and 2-aminoethanethiol short-chain alkanethiols were prepared by a one-step method in aqueous solution for monitoring pH and a range of heavy metal ions. The mode of transduction is optical, based on the change in aggregation of the nanoparticles in solution. Because of the different ionic interactions between the modified nanoparticles, these nanoparticle sensors can rapidly detect Pb2+, Cu2+ and Fe2+, with detection limits as low as 1 × 10−5 M, 5 × 10−7 M and 5 × 10−5 M respectively, as well as having the ability to detect Cu2+ ions from Pb2+ and Fe2+. Furthermore, the same functionalised nanoparticles are also sensitive to pH; exhibiting a good linear dynamic response between pH 1 and 10.

Graphical abstract: Multifunctional modified silver nanoparticles as ion and pH sensors in aqueous solution

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Publication details

The article was received on 02 Feb 2012, accepted on 19 Mar 2012 and first published on 20 Mar 2012


Article type: Paper
DOI: 10.1039/C2AN35147A
Citation: Analyst, 2012,137, 2338-2343
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    Multifunctional modified silver nanoparticles as ion and pH sensors in aqueous solution

    X. Chen, X. Cheng and J. J. Gooding, Analyst, 2012, 137, 2338
    DOI: 10.1039/C2AN35147A

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