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SWCNT-FET sensor for the detection of Hg2+. (a) Schematic of the proposed mechanism for the selectivity toward Hg2+. (b) Real-time measurement of the change in current after exposures to various concentration of Hg2+. (c) Sensitivity vs. concentration of various metal cations. Reproduced with permission from Ref. 426. Copyright 2009, American Chemical Society.
