Dual-response for Hg2+ and Ag+ ions based on biomimetic funnel-shaped alumina nanochannels
作者： Huimin Wang , Shengnan Hou , Qinqin Wang , Zhiwei Wang , Xia Fan
DOI: 10.1039/C4TB01804D
关键词:
摘要: Biomimetic dual-ion-responsive nanochannels were developed by the principles of metal-ion-mediated base pairs responsive T-/C-rich single strand DNA (ssDNA). The ssDNA was immobilized into funnel-shaped alumina nanochannels, which fabricated using anodization technology and pore-widening process. In neutral solution, conformation changed from a loosely packed structure duplex interacting with Hg2+ or Ag+ ions (T–Hg2+–T C–Ag+–C complexes). decreasing ionic currents through utilized to detect concentrations ions. conversion duplex-quadruplex could be triggered changing pH value aqueous solutions 4.5, whereas it did not happen in solution. Thus, ssDNA-modified selectively responded at 4.5 different transportation properties. biomimetic promised great potential multiplexed ion sensing.
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