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Selectable Ultrasensitive Detection of Hg(2+) with Rhodamine 6G-Modified Nanoporous Gold Optical Sensor.

Wang Z, Yang M, Chen C, Zhang L, Zeng H - Sci Rep (2016)

Bottom Line: An extremely sensitive fluorescence sensor has been developed for selectively detection of mercury ions based on metallophilic Hg(2+)-Au(+) interactions, which results in an effective release of pre-adsorbed rhodamine 6G (R6G) molecules from the nanoporous gold substrate, associated with a significant decrease of fluorescence intensity.The optical sensor has a detection sensitivity down to 0.6 pM for Hg(2+) and CH3Hg(+) ions, in particular a superior selectivity in a complex aqueous system containing 13 different types of metal ions, meanwhile maintaining a long-term stability after 10 cycles.Such a fluorescence sensor combining multiple advantages therefore present promising potentials in various applications.

View Article: PubMed Central - PubMed

Affiliation: Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

ABSTRACT
An extremely sensitive fluorescence sensor has been developed for selectively detection of mercury ions based on metallophilic Hg(2+)-Au(+) interactions, which results in an effective release of pre-adsorbed rhodamine 6G (R6G) molecules from the nanoporous gold substrate, associated with a significant decrease of fluorescence intensity. The optical sensor has a detection sensitivity down to 0.6 pM for Hg(2+) and CH3Hg(+) ions, in particular a superior selectivity in a complex aqueous system containing 13 different types of metal ions, meanwhile maintaining a long-term stability after 10 cycles. Such a fluorescence sensor combining multiple advantages therefore present promising potentials in various applications.

No MeSH data available.


Recyclability test of the R6G/MPA-NPG sensor.Normalized fluorescence peak intensities with 1 nM (square dots) or 1 μM (round dots) Hg2+ in the aqueous solution for 10 cycles. I0 indicates the fluorescence intensity of the R6G/MPA-NPG sensor before the recyclability test.
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f5: Recyclability test of the R6G/MPA-NPG sensor.Normalized fluorescence peak intensities with 1 nM (square dots) or 1 μM (round dots) Hg2+ in the aqueous solution for 10 cycles. I0 indicates the fluorescence intensity of the R6G/MPA-NPG sensor before the recyclability test.

Mentions: Reversibility and regeneration are the most important factor for the sensor, especially in remote and on-site applications. The R6G/MPA-NPG fluorescence sensor can be reused for several times and easily regenerated. After carefully wash with distilled water, the sensor can be easily reprocessed by immerging in 1 mM 3-mercaptopropionic acid (MPA) solution for 1 h, and then in R6G solution for 2 h. Figure 5 indicates 10 normative cycles of the regeneration of the R6G/MPA-NPG fluorescence sensor for detecting 1 nM and 1 μM Hg2+ in aqueous solutions. It can be seen that the fluorescence intensity decreases to 28–32% of the original one with 1 nM Hg2+, while 1 μM Hg2+ produces more than 93% decrease of the original intensity. Although the relative intensity of the fluorescence signal from R6G cannot be fully recovered, the variation ratio is less than 3% within 10 cycles.


Selectable Ultrasensitive Detection of Hg(2+) with Rhodamine 6G-Modified Nanoporous Gold Optical Sensor.

Wang Z, Yang M, Chen C, Zhang L, Zeng H - Sci Rep (2016)

Recyclability test of the R6G/MPA-NPG sensor.Normalized fluorescence peak intensities with 1 nM (square dots) or 1 μM (round dots) Hg2+ in the aqueous solution for 10 cycles. I0 indicates the fluorescence intensity of the R6G/MPA-NPG sensor before the recyclability test.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940742&req=5

f5: Recyclability test of the R6G/MPA-NPG sensor.Normalized fluorescence peak intensities with 1 nM (square dots) or 1 μM (round dots) Hg2+ in the aqueous solution for 10 cycles. I0 indicates the fluorescence intensity of the R6G/MPA-NPG sensor before the recyclability test.
Mentions: Reversibility and regeneration are the most important factor for the sensor, especially in remote and on-site applications. The R6G/MPA-NPG fluorescence sensor can be reused for several times and easily regenerated. After carefully wash with distilled water, the sensor can be easily reprocessed by immerging in 1 mM 3-mercaptopropionic acid (MPA) solution for 1 h, and then in R6G solution for 2 h. Figure 5 indicates 10 normative cycles of the regeneration of the R6G/MPA-NPG fluorescence sensor for detecting 1 nM and 1 μM Hg2+ in aqueous solutions. It can be seen that the fluorescence intensity decreases to 28–32% of the original one with 1 nM Hg2+, while 1 μM Hg2+ produces more than 93% decrease of the original intensity. Although the relative intensity of the fluorescence signal from R6G cannot be fully recovered, the variation ratio is less than 3% within 10 cycles.

Bottom Line: An extremely sensitive fluorescence sensor has been developed for selectively detection of mercury ions based on metallophilic Hg(2+)-Au(+) interactions, which results in an effective release of pre-adsorbed rhodamine 6G (R6G) molecules from the nanoporous gold substrate, associated with a significant decrease of fluorescence intensity.The optical sensor has a detection sensitivity down to 0.6 pM for Hg(2+) and CH3Hg(+) ions, in particular a superior selectivity in a complex aqueous system containing 13 different types of metal ions, meanwhile maintaining a long-term stability after 10 cycles.Such a fluorescence sensor combining multiple advantages therefore present promising potentials in various applications.

View Article: PubMed Central - PubMed

Affiliation: Shanghai Key Laboratory of Modern Optical System, Engineering Research Center of Optical Instrument and System (Ministry of Education), School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China.

ABSTRACT
An extremely sensitive fluorescence sensor has been developed for selectively detection of mercury ions based on metallophilic Hg(2+)-Au(+) interactions, which results in an effective release of pre-adsorbed rhodamine 6G (R6G) molecules from the nanoporous gold substrate, associated with a significant decrease of fluorescence intensity. The optical sensor has a detection sensitivity down to 0.6 pM for Hg(2+) and CH3Hg(+) ions, in particular a superior selectivity in a complex aqueous system containing 13 different types of metal ions, meanwhile maintaining a long-term stability after 10 cycles. Such a fluorescence sensor combining multiple advantages therefore present promising potentials in various applications.

No MeSH data available.