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Real-time selective visual monitoring of Hg(2+) detection at ppt level: An approach to lighting electrospun nanofibers using gold nanoclusters.

Senthamizhan A, Celebioglu A, Uyar T - Sci Rep (2015)

Bottom Line: The resultant AuNC*PCL-NF exhibiting remarkable stability more than four months at ambient environment and facilitates increased accessibility to active sites resulting in improved sensing performance with rapid response time.The underlying mechanism is found to be due to the formation of Au-Hg amalgam, which was further investigated with XPS, TEM and elemental mapping studies.In short, our findings may lead to develop very efficient fluorescent-based nanofibrous mercury sensor, keeping in view of its stability, simplicity, reproducibility, and low cost.

View Article: PubMed Central - PubMed

Affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey.

ABSTRACT
In this work, fluorescent gold nanocluster (AuNC) decorated polycaprolactone (PCL) nanofibers (AuNC*PCL-NF) for real time visual monitoring of Hg(2+) detection at ppt level in water is demonstrated. The resultant AuNC*PCL-NF exhibiting remarkable stability more than four months at ambient environment and facilitates increased accessibility to active sites resulting in improved sensing performance with rapid response time. The fluorescence changes of AuNC*PCL-NF and their corresponding time dependent spectra, upon introduction of Hg(2+), led to the visual identification of the sensor performance. It is observed that the effective removal of excess ligand (bovine serum albumin (BSA) greatly enhances the surface exposure of AuNC and therefore their selective sensing performance is achieved over competent metal ions such as Cu(2+), Ni(2+), Mn(2+), Zn(2+), Cd(2+), and Pb(2+) present in the water. An exceptional interaction is observed between AuNC and Hg(2+), wherein the absence of excess interrupting ligand makes AuNC more selective towards Hg(2+). The underlying mechanism is found to be due to the formation of Au-Hg amalgam, which was further investigated with XPS, TEM and elemental mapping studies. In short, our findings may lead to develop very efficient fluorescent-based nanofibrous mercury sensor, keeping in view of its stability, simplicity, reproducibility, and low cost.

No MeSH data available.


Related in: MedlinePlus

(a) CLSM images of AuNC*PCL-SNF before and after addition of Hg2+ (100 ppt and 1 ppt) solution and their corresponding DIC image is presented in Figure. (b) The result shows that there is no change in their morphology and only the fluorescence feature of the NF changed according to the concentration. (c) The resultant fluorescence spectra collected from the surface of the NF.
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f3: (a) CLSM images of AuNC*PCL-SNF before and after addition of Hg2+ (100 ppt and 1 ppt) solution and their corresponding DIC image is presented in Figure. (b) The result shows that there is no change in their morphology and only the fluorescence feature of the NF changed according to the concentration. (c) The resultant fluorescence spectra collected from the surface of the NF.

Mentions: Upon exposure of 100 ppt Hg2+, the fluorescence intensity of the AuNC*PCL-SNF completely disappeared, whereas upon introduction of 1ppt, considerable response has been noticed following the collection of the spectra, as illustrated in Fig. 3. The differential interference contrast (DIC) image confirms no obvious changes in the NF morphology identified in the presence of Hg2+. The important notable thing here is that there was no considerable change in emission features when the concentration of Hg2+ was below 100 ppt in bulk ensembles of NF, thus indicating the limit of Hg2+ detection. The observed difference in the sensing performance of NF ensemble might be due to the limited diffusion ability of mercury ions into interior surface of the membrane. Uniform decreases in the emission intensity along the NF mark a significant development of a reliable method for real time application.


Real-time selective visual monitoring of Hg(2+) detection at ppt level: An approach to lighting electrospun nanofibers using gold nanoclusters.

Senthamizhan A, Celebioglu A, Uyar T - Sci Rep (2015)

(a) CLSM images of AuNC*PCL-SNF before and after addition of Hg2+ (100 ppt and 1 ppt) solution and their corresponding DIC image is presented in Figure. (b) The result shows that there is no change in their morphology and only the fluorescence feature of the NF changed according to the concentration. (c) The resultant fluorescence spectra collected from the surface of the NF.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4446990&req=5

f3: (a) CLSM images of AuNC*PCL-SNF before and after addition of Hg2+ (100 ppt and 1 ppt) solution and their corresponding DIC image is presented in Figure. (b) The result shows that there is no change in their morphology and only the fluorescence feature of the NF changed according to the concentration. (c) The resultant fluorescence spectra collected from the surface of the NF.
Mentions: Upon exposure of 100 ppt Hg2+, the fluorescence intensity of the AuNC*PCL-SNF completely disappeared, whereas upon introduction of 1ppt, considerable response has been noticed following the collection of the spectra, as illustrated in Fig. 3. The differential interference contrast (DIC) image confirms no obvious changes in the NF morphology identified in the presence of Hg2+. The important notable thing here is that there was no considerable change in emission features when the concentration of Hg2+ was below 100 ppt in bulk ensembles of NF, thus indicating the limit of Hg2+ detection. The observed difference in the sensing performance of NF ensemble might be due to the limited diffusion ability of mercury ions into interior surface of the membrane. Uniform decreases in the emission intensity along the NF mark a significant development of a reliable method for real time application.

Bottom Line: The resultant AuNC*PCL-NF exhibiting remarkable stability more than four months at ambient environment and facilitates increased accessibility to active sites resulting in improved sensing performance with rapid response time.The underlying mechanism is found to be due to the formation of Au-Hg amalgam, which was further investigated with XPS, TEM and elemental mapping studies.In short, our findings may lead to develop very efficient fluorescent-based nanofibrous mercury sensor, keeping in view of its stability, simplicity, reproducibility, and low cost.

View Article: PubMed Central - PubMed

Affiliation: UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey.

ABSTRACT
In this work, fluorescent gold nanocluster (AuNC) decorated polycaprolactone (PCL) nanofibers (AuNC*PCL-NF) for real time visual monitoring of Hg(2+) detection at ppt level in water is demonstrated. The resultant AuNC*PCL-NF exhibiting remarkable stability more than four months at ambient environment and facilitates increased accessibility to active sites resulting in improved sensing performance with rapid response time. The fluorescence changes of AuNC*PCL-NF and their corresponding time dependent spectra, upon introduction of Hg(2+), led to the visual identification of the sensor performance. It is observed that the effective removal of excess ligand (bovine serum albumin (BSA) greatly enhances the surface exposure of AuNC and therefore their selective sensing performance is achieved over competent metal ions such as Cu(2+), Ni(2+), Mn(2+), Zn(2+), Cd(2+), and Pb(2+) present in the water. An exceptional interaction is observed between AuNC and Hg(2+), wherein the absence of excess interrupting ligand makes AuNC more selective towards Hg(2+). The underlying mechanism is found to be due to the formation of Au-Hg amalgam, which was further investigated with XPS, TEM and elemental mapping studies. In short, our findings may lead to develop very efficient fluorescent-based nanofibrous mercury sensor, keeping in view of its stability, simplicity, reproducibility, and low cost.

No MeSH data available.


Related in: MedlinePlus