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  • Title: Electrodeposited gold-copper core-shell nanowires for high sensitivity DNA detection.
    Author: Spain E, McCooey A, Dolan C, Bagshaw H, Leddy N, Keyes TE, Forster RJ.
    Journal: Analyst; 2014 Nov 07; 139(21):5504-8. PubMed ID: 25184761.
    Abstract:
    Gold-Copper core shell nanowires have been electrodeposited and their electrochemical and Raman properties probed. First, hollow copper nanotubes, 3.2 ± 0.1 μm long, with a uniform diameter of 70 ± 22 nm, were electrodeposited within the pores of a track etched polycarbonate membrane filter. Second, gold was then electrodeposited within these copper cylinders to yield the gold-copper core-shell nanowires. Nanowires, functionalised with probe strand DNA, that is complementary to that of the pathogen Staph. Aureus, only on their ends, can be immobilised onto an electrode surface in a DNA sandwich assay. Significantly, the charge associated with the selective oxidation of the copper shell depends linearly on the target DNA concentration from 1 nM to 100 μM.
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