Copper detection utilizing dendrimer and gold nanowire-induced surface plasmon resonance

Priyanka Bhattacharya, Pengyu Chen, Meredith Newby Spano, Lin Zhu, Pu Chun Ke

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A new physical scheme is presented for the detection of copper, based on the use of a fluorescently labeled dendrimer anchored on a gold nanowire. Upon light illumination surface plasmon resonance was generated from the gold nanowire, which promoted quenching of the dendrimer fluorescence as a result of the energy transfer between the dendrimer and the copper ions. The monotonic dependence of the fluorescence quenching on copper concentration was exploited to reach a copper detection sensitivity of 2 nM. In addition, the fluorescence of the labeled dendrimers was quenched specifically by copper in a matrix of common metal ions. Using simulations we calculated the enhanced optical near field for a dendrimer-coated gold nanowire illuminated by a TM-polarized plane wave, which provided a physical basis for the sensitive copper detection using the current experimental scheme.

Original languageEnglish
Article number014911
JournalJournal of Applied Physics
Issue number1
Publication statusPublished - 1 Jan 2011
Externally publishedYes

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