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In this paper, we developed a simple, rapid, selective and colorimetric method to detect iodide (I−) by etching silver-coated gold nanobipyramids (Au NBs@Ag nanostructure) in the presence of Cu2+. The detection is based on the reaction that Cu2+ could oxidize I− into I2, which sequentially etches the Ag shell of Au NBs@Ag nanostructure. When the Ag coating is thick and the Au NBs are buried in Ag...
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