Journal
ACS SENSORS
Volume 4, Issue 3, Pages 704-710Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b01558
Keywords
surface plasmon resonance; fiber-optic SPR; mercury; 4-mercaptopyridine; Au nanoparticles
Funding
- National Nature Science Foundation of China (NSFC) [61520106013, 61727016, 11474043, 21603021]
- Fundamental Research Funds for the Central Universities [DUT18ZD215, DUT15RC(3)115]
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As a highly toxic heavy metal ion, divalent mercuric ion (Hg2+) is one of the most widely diffused and hazardous environmental pollutants. In this work, a simple, portable, and inexpensive fiber-optic sensor based on surface plasmon resonance (SPR) effect was developed for Hg2+ detection, which takes advantage of 4-mercaptopyridine (4-MPY)-functionalized Au nanoparticles (Au NPs/4-MPY) as a signal amplification tag. Based on the coordination between Hg2+ and nitrogen in the pyridine moiety, we developed the sensor by self-assembling 4-MPY on Au film surfaces to capture Hg2+ and then introducing Au NPs/4-MPY to generate a plasmonic coupling structure with the configuration of nanoparticle-on-mirror. The coupling between localized SPR increased changes in SPR wavelength, which allowed highly sensitive Hg2+ sensing in aqueous solution. The sensor exhibited superior selectivity for Hg2+ detection compared with other common metal ions in water. The sensor's Hg2+ detection limit is 8 nM under optimal conditions. Furthermore, we validated the sensor's practicality for Hg2+ detection in tap water samples and demonstrated its potential application for environmental water on-site monitoring.
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