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Issue 8, 2015
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Dual-response for Hg2+ and Ag+ ions based on biomimetic funnel-shaped alumina nanochannels

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Abstract

Biomimetic dual-ion-responsive nanochannels were developed by the principles of metal-ion-mediated base pairs of the responsive T-/C-rich single strand DNA (ssDNA). The responsive ssDNA was immobilized into the funnel-shaped alumina nanochannels, which were fabricated using the anodization technology and pore-widening process. In neutral solution, the conformation of the ssDNA changed from a loosely packed structure into a duplex structure by interacting with Hg2+ or Ag+ ions (T–Hg2+–T or C–Ag+–C complexes). The decreasing ionic currents through the nanochannels were utilized to detect concentrations of Hg2+ or Ag+ ions. The conversion of duplex-quadruplex of Ag+ ions and DNA could be triggered by changing the pH value of aqueous solutions to 4.5, whereas it did not happen in Hg2+ ions solution. Thus, the ssDNA-modified alumina nanochannels selectively responded to Hg2+ and Ag+ ions at pH 4.5 with different ionic transportation properties. The biomimetic dual-ion-responsive nanochannels promised great potential in multiplexed ion sensing.

Graphical abstract: Dual-response for Hg2+ and Ag+ ions based on biomimetic funnel-shaped alumina nanochannels

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Publication details

The article was received on 02 Nov 2014, accepted on 04 Jan 2015 and first published on 06 Jan 2015


Article type: Paper
DOI: 10.1039/C4TB01804D
J. Mater. Chem. B, 2015,3, 1699-1705

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    Dual-response for Hg2+ and Ag+ ions based on biomimetic funnel-shaped alumina nanochannels

    H. Wang, S. Hou, Q. Wang, Z. Wang, X. Fan and J. Zhai, J. Mater. Chem. B, 2015, 3, 1699
    DOI: 10.1039/C4TB01804D

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