Journal
ANALYTICAL CHEMISTRY
Volume 84, Issue 9, Pages 4057-4062Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac3000336
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Funding
- National Science Foundation through the Industry/University Cooperative Research Center on Water Equipment & Policy located at the University of Wisconsin-Milwaukee and Marquette University [IIP-0968887]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- [IIP-1128158]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [0968887, 1128158] Funding Source: National Science Foundation
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Fast and accurate detection of aqueous contaminants is of significant importance as these contaminants raise serious risks for human health and the environment. Mercury and its compounds are highly toxic and can cause various illnesses; however, current mercury detectors suffer from several disadvantages, such as slow response, high cost, and lack of portability. Here, we report field-effect transistor (FET) sensors based on thermally reduced graphene oxide (rGO) with thioglycolic acid (TGA) functionalized gold nanoparticles (Au NPs) (or rGO/TGA-AuNP hybrid structures) for detecting mercury(II) ions in aqueous solutions. The lowest mercury(II) ion concentration detected by the sensor is 2.5 X 10(-8) M. The drain current shows rapid response within less than 10 s after the solution containing Hg2+ ions was added to the active area of the rGO/TGA-AuNP hybrid sensors. Our work suggests that rGO/TGA-AuNP hybrid structures are promising for low-cost, portable, real-time, heavy metal ion detectors.
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