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Issue 3, 2014
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High sensitivity molecule detection by plasmonic nanoantennas with selective binding at electromagnetic hotspots

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Abstract

We report a highly sensitive biomolecule detection by plasmonic nanoantenna arrays with selective binding at the optical hotspots. The plasmonic nanoantennas consist of two separated Au nanorods with a thin Ti disk placed in between. By using selective surface modification chemistry, controlled binding occurs only in the gaps between the plasmonic nanoantennas, which ensures a high detection sensitivity. Both optical characterization using a dark field microscope and the FDTD simulation show that after the streptavidin binding, the signal increases with decreasing gap size. Compared to a single nanorod, the signal obtained per bound molecule in the nanoantennas increases by a factor of six, which is promising with respect to the future detection of single molecules.

Graphical abstract: High sensitivity molecule detection by plasmonic nanoantennas with selective binding at electromagnetic hotspots

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Publication details

The article was received on 23 Aug 2013, accepted on 24 Oct 2013 and first published on 28 Oct 2013


Article type: Paper
DOI: 10.1039/C3NR04494G
Citation: Nanoscale, 2014,6, 1416-1422
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    High sensitivity molecule detection by plasmonic nanoantennas with selective binding at electromagnetic hotspots

    N. Zhang, Y. J. Liu, J. Yang, X. Su, J. Deng, C. C. Chum, M. Hong and J. Teng, Nanoscale, 2014, 6, 1416
    DOI: 10.1039/C3NR04494G

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