Emission Modulation of DNA-Templated Fluorescent Silver Nanoclusters by Divalent Magnesium Ion

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Abstract:

DNA-templated fluorescent silver nanoclusters (Ag NCs) composed of several or tens of atoms are gaining much interest because of their unique properties and convenient emission tunability by DNA sequence and length. However, the modulation by other factors other than DNA is also dependent on the special DNA secondary structure formation such as i-motif or G-quadruplex that is stimulated by pH or K+. One main observation considered in this work is emission modulation of Ag NCs by divalent Mg2+ during or after the clusters' creation. Tuning the emitting intensities and band positions can be realized by Mg2+ addition for the examined single-stranded DNA (ss-DNA) templates, which is dependent on the addition moment of Mg2+, while only intensity modulation should be achieved for the used double-stranded DNA (ds-DNA). Despite of this discrepancy, Mg2+ addition always induces a lifetime-varied emission state of Ag NCs. The modulated emission still follows the common nature of the previously used DNA sequence- and length-dependent emitting. Efficient screening the negative charges of DNA backbone upon addition of the divalent ion is responsible for the modulation by adaptively accommodating the formed Ag NCs. This strategy could be more advantageous over the emission modulation by DNA sequence and length because a desired emitting could be achieved only by alteration of the electrolyte conditions during or after the Ag NCs' creation.

Keywords: DNA; EMISSION MODULATION; FLUORESCENCE; MAGNESIUM ION; SILVER NANOCLUSTERS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2012.5665

Publication date: February 1, 2012

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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