Fluorescent sensing of mercury(ii) based on formation of catalytic gold nanoparticles

Yan, Lijuan; Chen, Zhaopeng; Zhang, Zhiyang; Qu, Chengli; Chen, Lingxin; Shen, Dazhong

doi:10.1039/c3an00725a

Cited by 49 publications

(25 citation statements)

References 35 publications

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“…Many methods have been developed in last decades where mostly complex and sophisticated techniques [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] have been utilized to detect Hg(II) ion from nanomolar to subnanomolar level. Our simple, green and economically viable technique gives the detection limit of 275 picomolar (55 ppt) which is mostly superior [14][15][16][17][18][19][20][21][22][26][27][28] or at par [23][24][25] to those methods (Table S3, Supporting information).…”

Section: Comparison Of Other Methods For the Detection Of Hg 2+ With mentioning

confidence: 99%

Label-Free Cysteamine-Capped Silver Nanoparticle-Based Colorimetric Assay for Hg(II) Detection in Water with Subnanomolar Exactitude

Bhattacharjee

Chakraborty

2014

ACS Sustainable Chem. Eng.

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Precisely probing heavy metal pollutants in water warrants novel methods and materials. To this end, functionalisation of nanoparticles using biologically important substances through a green route is one of the novel aspects for the design of an optical sensor. In this article we report a green preparative strategy for the synthesis of cysteamine stabilized silver nanoparticles (Ag-Nps) in aqueous medium. The water soluble Ag-Nps are found to be highly sensitive and selective for rapid colorimetric detection of Hg(II) ion with a limit of detection (LOD) of 0.273 nM (55 ppt). This system also enables us to detect Hg(II) through naked eye with a LOD of 2.73 nM (0.55 ppb) which is below the WHO permissible limit (10 nM or 2 ppb).Cysteamine undergoes cooperative coordination with the mercury ion leading to spontaneous formation of mercury-cysteamine complex and consequently forms Ag-Hg nano-alloy, which in turn changes the surface plasmon property of the Ag-Nps to allow detection of Hg(II) ion with sub-nanomolar precision. Furthermore, the Ag-Nps were tested for detection of Hg(II) in different real water samples with satisfying recoveries over 96-102 %.

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Section: Comparison Of Other Methods For the Detection Of Hg 2+ With mentioning

confidence: 99%

Label-Free Cysteamine-Capped Silver Nanoparticle-Based Colorimetric Assay for Hg(II) Detection in Water with Subnanomolar Exactitude

Bhattacharjee

Chakraborty

2014

ACS Sustainable Chem. Eng.

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“…Since the produced DAP has uorescence in the range of 450-700 nm, 27 we chose 785 nm wavelength as the excitation laser to avoid the uorescence interference (see a comparison of SERS spectra of DAP under different excitation wavelength, Fig. Since the produced DAP has uorescence in the range of 450-700 nm, 27 we chose 785 nm wavelength as the excitation laser to avoid the uorescence interference (see a comparison of SERS spectra of DAP under different excitation wavelength, Fig.…”

Section: Sers Measurementsmentioning

confidence: 99%

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Chen

et al. 2015

RSC Adv.

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A surface-enhanced Raman scattering (SERS) sensor of mercury ions based on the coordinated catalytic reaction of Hg 2+ -Ag nanoparticles (NPs) has been designed and constructed for water quality monitoring. We combined Ag NPs (average particle size is 49 nm) with mercury ions to form Hg 2+ -Ag NPs in aqueous phase by electrostatic interactions. The formed Hg 2+ -Ag particles can catalyze a redox reaction between o-phenylendiamine (OPD) and dissolved oxygen to form 2,3diaminephenazine (DAP), which is Raman-active and possesses a strong SERS signal due to the adherence to Ag NPs. Therefore we can trace the SERS intensity of DAP to determine mercury ions and the lowest detectable concentration of mercury is 1.0 nM using this method. This sensor displays higher sensitivity and selectivity and it possesses a certain value in terms of water quality detection.

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“…In the presence of Hg 2+ ions, AuNPs demonstrate strong peroxidase-mimicking behaviour for the oxidation of 3,3',5,5'-tetramethybenzidine (TMB) substrate, due to Au-Hg amalgamation [27][28][29][30]. These important findings have resulted in the development of fluorescence [31] colorimetric [32] and paper-based sensors [33] and the exploitation of catalytically-active nanomaterials including DNA-Ag/Pt nanoclusters [34] and manganese dioxide (MnO2) nanorods [35] for the detection of Hg 2+ ions.…”

Section: Introductionmentioning

confidence: 99%

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

et al. 2020

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Mercury (Hg) is extremely toxic, and continues to cause major threats to aquatic life, human health and the environment. Hg 2+ mainly derives from seawater as a product of atmospheric deposition, therefore there is great demand for sensing approaches that can detect Hg 2+ in seawater samples. Herein, we demonstrate that the peroxidase-mimicking activity of gold nanoparticles (AuNPs) or so-called nanozymes, can be exploited for the detection of Hg 2+ ions in various water samples. In a high electrolyte environment, the catalytic activity for the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) was significantly diminished due to poor stability of the bare-AuNPs. This activity was reduced by ~ 73.7% when the NaCl concentration was higher than 1.168%, which is much lower than that of seawater (~ 3.5%), thus presenting its unsuitability for detecting Hg 2+ in harsh water matrices. To overcome this limitation, AuNPs were first functionalized with oligo-ethylene glycol (OEG), of which their colloidal form presented high stability in NaCl concentrations up to 20% and across a wide range of pHs from 1-14. Interestingly, the catalytic activity of OEG-AuNPs for the oxidation of TMB was strongly suppressed by the coating, but enhanced upon formation of Au-Hg amalgamation. This novel finding underlies a straightforward, sensitive, and highly selective detection platform for Hg 2+ in water samples. The approach could detect the exposure limit level for Hg 2+ in drinking water (i.e., 2 ppb for tap and bottled water) as set by the United States Environmental Protection Agency (EPA) and the World Health Organization (WHO). When Hg 2+ was spiked into a 3.5% saline solution and a coastal seawater certified reference material (CRM), the detection limits were found to be 10 and 13 ppb, respectively, which exceed the Hg 2+ concentrations commonly found within seawater (~ 60-80 ppb). The whole procedure takes less than 45 min to conduct, providing a highly innovative, rapid and low-cost approach for detecting Hg 2+ in complex water matrices.

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Fluorescent sensing of mercury(ii) based on formation of catalytic gold nanoparticles

Cited by 49 publications

References 35 publications

Label-Free Cysteamine-Capped Silver Nanoparticle-Based Colorimetric Assay for Hg(II) Detection in Water with Subnanomolar Exactitude

Label-Free Cysteamine-Capped Silver Nanoparticle-Based Colorimetric Assay for Hg(II) Detection in Water with Subnanomolar Exactitude

Highly sensitive SERS sensor for mercury ions based on the catalytic reaction of mercury ion decorated Ag nanoparticles

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

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