Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 113, Issue 45, Pages 19393-19396Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp908902k
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Funding
- KOSEF [2009-0079103]
- Basic Research Promotion Fund [KRF-2008-314-C00118]
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We have developed a selective, sensitive, and fast single-walled carbon nanotube (swCNT) field effect transistor (FET) sensor for Hg2+ ion detection. This sensor is based on the anomalous response of swCNT conductance to the exposure of Hg2+, which provides the selectivity toward Hg2+ over various other metal ions through a strong redox reaction between swCNTs and Hg2+. our sensor system exhibited a detection limit of 10 nM for Hg2+ in water, which is comparable with the maximum allowable limit of mercury ions in drinking water set by most government environmental protection agencies. It also has a wide measurable detection range from 10 nM to 1 mM and a sensitive quantifying range with a steep slope for Hg2+ detection.
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