Journal
NANOSCALE
Volume 10, Issue 8, Pages 4010-4018Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr07935d
Keywords
-
Categories
Funding
- National Basic Research Program of China (973 Program) [2013CB934400, 2012CB932400]
- NSFC [61361160412, 51072126, 21575096]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- China Postdoctoral Science Foundation [7131701914]
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
Ask authors/readers for more resources
Lead ions (Pb2+) and mercury ions (Hg2+), the two commonly coexisting heavy metal ions, pose severe risks to environment and human health. To date, no surface-enhanced Raman scattering (SERS) sensor has been reported for the simultaneous quantification of Pb2+ and Hg2+ in real systems. Herein, the first demonstration of SERS chips for simultaneous quantification of Pb-2+ and Hg2+ in real systems is presented based on the combination of reproducible silicon nanohybrid substrates and a corrective internal standard (IS) sensing strategy. This chip was made of a silver nanoparticle-decorated silicon wafer via modification of the IS, i.e. 4-aminothiophenol, molecules. The as-prepared chip was further functionalized with Pb2+ and Hg2+-specific DNA strands capable of simultaneously detecting Pb2+ and Hg2+. Quantitatively, upon correction by the IS Raman signals, the broad dynamic ranges from 100 pM to 10 mu M for Pb2+ and from 1 nM to 10 mu M for Hg2+ were achieved, with the detection limit down to 19.8 ppt for Pb2+ and 168 ppt for Hg2+. For real applications, we further demonstrated that Pb2+ and Hg2+ spiked into industrial wastewater could be readily distinguished via the presented chip, and the relative standard deviation (RSD) value was less than similar to 15%. More significantly, the resulting SERS chip can be well coupled with a hand-held Raman instrument and can then be used for the qualitative analysis of both Pb2+ and Hg2+ in real systems in a portable manner. Our results suggest that this high-quality SERS chip is a powerful tool for on-site detection of various heavy metal ions in real samples in the field of food safety and environment protection.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available