期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 307, 期 -, 页码 137-144出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.12.040
关键词
Mercury; Citrate; Precipitation; Localized Surface Plasmon Resonance; Receptor-free
资金
- NLRL Program - Ministry of Science, ICT and Future Planning of the Republic of Korea [2015051036]
- GRL Program - Ministry of Science, ICT and Future Planning of the Republic of Korea [2015054826]
- World Institute of Kimchi of the Republic of Korea [KE1501-3]
- National Research Council of Science & Technology (NST), Republic of Korea [KE1501-3] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
A simple, receptor-free and regeneratable Hg2+ sensor, which utilizes localized surface plasmon resonance (LSPR) shifts of a gold nanorod (GNR), has been developed. Precipitation induced by coordination of Hg2+ to citrate alters the local refractive index (RI) around the GNR surface on glass slide, promoting a red-shift in its LSPR absorption peak. This phenomenon is used to design a sensor that enables quantitative detection of Hg2+ in the 1 nM to 1 mM concentration range with good linearity (0.9507 correlation coefficient) and limit of detection (LOD) is reached to 0.38 nM. A high selectivity of this sensor for Hg2+ is demonstrated by the specific LSPR red-shift of 27.67 nm promoted by Hg2+ in comparison to those caused by other metal ions. In addition, the reusability of the new sensor chip is shown by its successful reuse eight-times following successive washing/precipitation steps. Lastly, the sensor displays excellent recoveries in spiking test with real water samples, such as tap water, lake and river. The simple combination of precipitation of Hg2+-citrate complex and the LSPR red-shift has led to the design of a novel sensing strategy for Hg2+ detection. (C) 2015 Elsevier B.V. All rights reserved.
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