Abstract
A surface-enhanced Raman scattering (SERS) platform for the selective trace analysis of Hg2+ ions was reported, based on poly-thymine (T) aptamer/2-naphthalenethiol (2-NT)-modified gold nanoparticles (AuNPs), which was an oligonucleotide-functionalized nanosensor and SERS chip. 2-NT was used as a Raman reporter, and T aptamer could form a T-Hg2+-T structure with Hg2+ ions making an SERS nanosensor absorbed to the SERS chip. The optimum concentrations of DNA and 2-NT were obtained. An average of 960 DNA molecules attached to each AuNP were measured. The limit of detection (LOD) was 1.0 ppt (1.0 × 10 12 g/mL), which is far below the limit of 10.0 ppb for drinking water, stipulated by the World Health Organization. The sensor has the advantages of low detection cost, a simple sample pretreatment, a green solution and reducing false positives. Furthermore, the nanosensor was used for the determination of trace Hg2+ in the water of a lake; a reliable result was obtained accurately.
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Acknowledgments
This work was supported by Tianjin Science and Technology Support Key Project (No. 16YFZCSY00850), National Natural Science Foundation of China (No. 61376082), National Science and Technology Support Project under Grant (No. 2015BAJ01B01) and Science and Technology Support Project of Science and Technology Office in Xinjiang (No. 2015120024002113).
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Zou, Q., Li, X., Xue, T. et al. Sensitive and Selective Detection of Mercury Ions in Aqueous Media Using an Oligonucleotide-functionalized Nanosensor and SERS Chip. ANAL. SCI. 35, 493–498 (2019). https://doi.org/10.2116/analsci.18P381
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DOI: https://doi.org/10.2116/analsci.18P381