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Abstract
A versatile sensitive localized surface plasmon resonance sensor was fabricated for the determination of mercury(II) and cysteine. The determination of mercury(II) was performed by taking advantage of the affinity between core-shell nanostructure and mercury to form a nanocomposite, leading to significant changes of localized surface plasmon resonance properties. The outstanding selectivity and sensitivity of the method provide a unique way to determine mercury(II) to concentrations as low as 5.00 × 10−8 M in aqueous solution. In addition, a strategy of orientation axially (end-to-end) assembly of core-shell gold nanorods at acidic medium was been developed that resulted in coupling of the plasmon band of core-shell gold nanorods, and was the basis of determining cysteine. An ultra-sensitive assay for the determination of cysteine was subsequently developed and levels of cysteine as low as 10−12 M can be determined. Compared with other gold nanorods-based sensors requiring molecular modification, these two approaches are simple in aqueous solution because of the unmodified design.
Acknowledgments
This work was supported by Natural Science Foundation of China (21075035) and the Key Laboratory of Inorganic Coating Materials, Chinese Academy of Sciences.