期刊
ANALYTICA CHIMICA ACTA
卷 891, 期 -, 页码 269-276出版社
ELSEVIER
DOI: 10.1016/j.aca.2015.06.043
关键词
Au@Ag core-shell nanoparticles; Colorimetric; Iodide ion; Dried kelps; Agarose gels
资金
- National Nature Scientific Foundations of China [21105123]
- Fundamental Research Funds for the Central Universities [14CX02216A, 15CX02070A]
Au@Ag core-shell nanoparticles (NPs) were synthesized and coupled with copper ion (Cu2+) 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-Cu2+ system/solution, Cu2+ can oxidize I- into iodine (I-2), 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 mu M, and it exhibited excellent selectivity for I- over other common anions tested. Furthermore, Au@Ag core-shell NPs-Cu2+ was embedded into agarose gels as inexpensive and portable test strips, which were successfully used for the semi-quantitation of I- in dried kelps. (C) 2015 Elsevier B.V. All rights reserved.
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