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Issue 7, 2005
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Ultrasensitive voltammetric detection of trace heavy metal ions using carbon nanotube nanoelectrode array

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Abstract

We describe an ultrasensitive voltammetric detection of trace heavy metal ions using nanoelectrode arrays (NEAs) that are based on low-site density carbon nanotubes (CNTs). The NEAs were prepared by sealing the side-walls of CNTs with an epoxy passive layer that reduces the current leakage and eliminates the electrode capacitance, leading to a low background current. This provides a high signal-to-noise ratio. The CNTs-NEAs coated with a bismuth film were used successfully for voltammetric detection of trace cadmium(II) and lead(II) at the sub-ppb level. The detection limit of 0.04 μg L−1 was obtained under optimum experimental conditions. The attractive behavior of the new carbon NEA sensing platform holds great promise for onsite environmental monitoring and biomonitoring of toxic metals.

Graphical abstract: Ultrasensitive voltammetric detection of trace heavy metal ions using carbon nanotube nanoelectrode array

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Publication details

The article was received on 06 Jan 2005, accepted on 18 Apr 2005 and first published on 18 May 2005


Article type: Paper
DOI: 10.1039/B419447K
Analyst, 2005,130, 1098-1101

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    Ultrasensitive voltammetric detection of trace heavy metal ions using carbon nanotube nanoelectrode array

    G. Liu, Y. Lin, Y. Tu and Z. Ren, Analyst, 2005, 130, 1098
    DOI: 10.1039/B419447K

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