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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.


Characterization of the R6G/MPA-NPG fluorescence sensor.(a) Typical SEM micrograph of NPG and the experimental set-up for the Hg2+ detection. (b) Schematic representation of the preparation of the R6G/MPA-NPG fluorescence sensor for detection of mercury ions based on displacement of R6G units on NPG.
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f1: Characterization of the R6G/MPA-NPG fluorescence sensor.(a) Typical SEM micrograph of NPG and the experimental set-up for the Hg2+ detection. (b) Schematic representation of the preparation of the R6G/MPA-NPG fluorescence sensor for detection of mercury ions based on displacement of R6G units on NPG.

Mentions: NPG with bicontinuous nanopores and ligaments spanning through the entire film, has been demonstrated to be an excellent plasmonic substrate. Due to the large curvature and the electromagnetic coupling between the neighbor ligaments, intense electromagnetic fields can be generated near the nano-scaled gold ligament surface, and fluorescence signal from fluorescent species nearby the NPG surface can be well enhanced27. Thus, NPG is a good candidate for sensor applications that require unvarying and reproducible signals from any detected regions of each sample28. Figure 1a shows a representative scanning electron microscope (SEM) image of the NPG substrate used in our study. The characteristic length of nanopores is 38 ± 2 nm, measured by a fast Fourier transform method29. NPG films are stabilized on polymer sheets for sensing detection, and the schematic of experimental set-up is shown in Fig. 1a.


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)

Characterization of the R6G/MPA-NPG fluorescence sensor.(a) Typical SEM micrograph of NPG and the experimental set-up for the Hg2+ detection. (b) Schematic representation of the preparation of the R6G/MPA-NPG fluorescence sensor for detection of mercury ions based on displacement of R6G units on NPG.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f1: Characterization of the R6G/MPA-NPG fluorescence sensor.(a) Typical SEM micrograph of NPG and the experimental set-up for the Hg2+ detection. (b) Schematic representation of the preparation of the R6G/MPA-NPG fluorescence sensor for detection of mercury ions based on displacement of R6G units on NPG.
Mentions: NPG with bicontinuous nanopores and ligaments spanning through the entire film, has been demonstrated to be an excellent plasmonic substrate. Due to the large curvature and the electromagnetic coupling between the neighbor ligaments, intense electromagnetic fields can be generated near the nano-scaled gold ligament surface, and fluorescence signal from fluorescent species nearby the NPG surface can be well enhanced27. Thus, NPG is a good candidate for sensor applications that require unvarying and reproducible signals from any detected regions of each sample28. Figure 1a shows a representative scanning electron microscope (SEM) image of the NPG substrate used in our study. The characteristic length of nanopores is 38 ± 2 nm, measured by a fast Fourier transform method29. NPG films are stabilized on polymer sheets for sensing detection, and the schematic of experimental set-up is shown in Fig. 1a.

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.