期刊
ACS SENSORS
卷 1, 期 3, 页码 295-302出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.5b00241
关键词
field-effect transistor; DNA; molybdenum disulfide; gold nanoparticle; Hg2+ detection
资金
- NSF [IIP-1434059]
- UWM Water Accelerator grant
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Div Of Industrial Innovation & Partnersh
- Directorate For Engineering [1434059] Funding Source: National Science Foundation
Mercury, one of the most harmful pollutants in water, has a significant negative impact on human health. The molybdenum disulfide (MoS2) nanosheet, due to its unique electronic properties, is a promising candidate for high-performance sensing materials. Here, we report a DNA-functionalized MoS2 nanosheet/gold nanoparticle hybrid field-effect transistor (FET) sensor for the ultrasensitive detection of Hg2+ in an aqueous environment. Specific DNA was used in the hybrid structure as the capture probe for the label-free detection. By monitoring the electrical characteristics of the FET device, the performance of the sensor was investigated. Our sensor shows a rapid response (1-2 s) to Hg2+ and an ultralow detection limit of 0.1 nM, which is much lower than the maximum contaminant level (MCL) for Hg2+ in drinking water (9.9 nM) recommended by the U.S. Environmental Protection Agency (EPA). In addition, the sensor shows a high selectivity to He compared with other interfering metal ions, e.g., As5+, Cd2+, Pb2+, and so forth. This rapid and ultrasensitive method for Hg2+ detection can either be potentially developed into stand-alone hand-held sensors or be integrated into existing water equipment for continuously monitoring the water quality.
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