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Issue 11, 2011
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Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips

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Abstract

Electrochemical electrodes based on dense and vertically aligned arrays of multi-walled carbon nanotubes (MWCNTs) were produced. The open tips of individual hollow nanotubes are exposed as active sites while the entangled nanotube stems encapsulated in epoxy collectively provide multiplexed and highly conductive pathways for charge transport. This unique structure together with the extraordinary electrical and electrochemical properties of MWCNTs offers a high signal-to-noise ratio (thus high sensitivity) and a large detection range, compared with other carbon-based electrodes. Our electrodes can detect K3FeCN6 and dopamine at concentrations as low as 5 nM and 10 nM, respectively, and are responsive in a large dynamic range that spans almost 5 orders of magnitude.

Graphical abstract: Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips

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Publication details

The article was received on 21 Jul 2011, accepted on 15 Sep 2011 and first published on 14 Oct 2011


Article type: Paper
DOI: 10.1039/C1NR10899A
Citation: Nanoscale, 2011,3, 4854-4858
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    Ultra-sensitive and wide-dynamic-range sensors based on dense arrays of carbon nanotube tips

    G. Sun, Y. Huang, L. Zheng, Z. Zhan, Y. Zhang, J. H. L. Pang, T. Wu and P. Chen, Nanoscale, 2011, 3, 4854
    DOI: 10.1039/C1NR10899A

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