Title of Paper:One-step rapid synthesis of single thymine-templated fluorescent copper nanoclusters for "turn on" detection of Mn2+

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Date of Publication:2017-05-07

Journal:ANALYTICAL METHODS

Included Journals:SCIE、EI

Volume:9

Issue:17

Page Number:2590-2595

ISSN No.:1759-9660

Abstract:Rich-thymine (T) single- or double-strand DNAs have been identified as efficient templates favoring the formation of fluorescent copper nanoparticles (Cu NPs). In this work, we confirmed single base T could be a template to synthesize water-soluble copper nanoclusters (Cu NCs@ T) for the first time. Our work provided basic evidence of the benefit of using T-rich DNA strands for the synthesis of fluorescent Cu NPs. Transmission electron microscopy demonstrated that Cu NCs@ T had a diameter of 2.8 +/- 0.5 nm, which is much smaller than Cu NPs templated by single- or double-strand DNAs. X-ray photoelectron spectroscopy confirmed the valence state of the Cu in Cu NCs@ T most likely lies between 0 and + 1. The as-prepared Cu NCs@ T exhibited yellow photoluminescence and the maximum excitation and emission peaks were at 354 nm and 561 nm, respectively. In addition, we also showed that the as-prepared Cu NCs@ T can be developed into a practical sensor for "turn-on" luminescence with the emission red-shifted detection of Mn2+ in aqueous solution with a high selectivity. The limit of detection for Mn2+ was determined to be 10 mu M and the linear response with the Mn2+ concentrations range from 100 mu M to 250 mu M.