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  • Title: A colorimetric assay for measuring iodide using Au@Ag core-shell nanoparticles coupled with Cu(2+).
    Author: Zeng J, Cao Y, Lu CH, Wang XD, Wang Q, Wen CY, Qu JB, Yuan C, Yan ZF, Chen X.
    Journal: Anal Chim Acta; 2015 Sep 03; 891():269-76. PubMed ID: 26388386.
    Abstract:
    Au@Ag core-shell nanoparticles (NPs) were synthesized and coupled with copper ion (Cu(2+)) for the colorimetric sensing of iodide ion (I(-)). This assay relies on the fact that the absorption spectra and the color of metallic core-shell NPs are sensitive to their chemical ingredient and dimensional core-to-shell ratio. When I(-) was added to the Au@Ag core-shell NPs-Cu(2+) system/solution, Cu(2+) can oxidize I(-) into iodine (I2), which can further oxidize silver shells to form silver iodide (AgI). The generated Au@AgI core-shell NPs led to color changes from yellow to purple, which was utilized for the colorimetric sensing of I(-). The assay only took 10 min with a lowest detectable concentration of 0.5 μM, and it exhibited excellent selectivity for I(-) over other common anions tested. Furthermore, Au@Ag core-shell NPs-Cu(2+) was embedded into agarose gels as inexpensive and portable "test strips", which were successfully used for the semi-quantitation of I(-) in dried kelps.
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