One-step rapid synthesis of single thymine-templated fluorescent copper nanoclusters for "turn on" detection of Mn2+. Issue 17 (25th April 2017)

• Record Type: Journal Article
• Authors: Han, Bingyan; Xiang, Rongchao; Hou, Xufen; Yu, Mingbo; Peng, Tingting; Li, Ying; He, Gaohong
• Is Part Of: Analytical methods. Volume 9:Issue 17(2017)
• Page Start: 2590
• Page End: 2595
• Publication Date: 2017-04-25
• Subjects: Chemistry, Analytic -- Periodicals; Analytical biochemistry -- Periodicals; Chemical laboratories -- Standards -- Periodicals; 543.1905
• DOI: 10.1039/c7ay00625j
• Languages: English
• ISSNs: 1759-9660

Abstract

Abstract : Single base T was confirmed to be a template to synthesize water-soluble copper nanoclusters for the first time, which was successfully used to detect Mn 2+ . 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 Mn 2+ in aqueous solution with a high selectivity. The limit of detection for Mn 2+ was determined to be 10 μM and the linear response with the Mn 2+ concentrations range from 100 μM to 250 μM.