Selective Detection of Mercury (II) Ion Using Nonlinear Optical Properties of Gold Nanoparticles

Darbha, Gopala Krishna; Singh, Anant Kumar; Shanker, Uma; Yu, Eugene; Yu, Hongtao; Ray, Paresh Chandra

doi:10.1021/ja801412b

Cited by 425 publications

(362 citation statements)

References 29 publications

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“…The unreacted reagents were discarded through centrifugation (17000 × g, 15 min). The concentration of P-AuNPs estimated from Beer's law was 3 nM, 25 and the P-AuNP stock solution was prepared by diluting the concentrated P-AuNPs at the bottom of centrifuge tubes to the original volume.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Colorimetric Au Nanoparticle Probe for Speciation Test of Arsenite and Arsenate Inspired by Selective Interaction between Phosphonium Ionic Liquid and Arsenite

Tan

Liu

Yin

et al. 2014

ACS Appl. Mater. Interfaces

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The exposure of millions of people to unsafe levels of arsenite (As III ) and arsenate (As V ) in drinking waters calls for the development of low-cost methods for on-site monitoring these two arsenic species in waters. Herein, for the first time, tetradecyl (trihexyl) phosphonium chloride ionic liquid was found to selectively bind with As III via extended Xray absorption fine structure (EXAFS) analysis. Based on the finding, an As III -specific probe was developed by modifying gold nanoparticles with the ionic liquid. Futhermore, Hofmeister effect was primarily observed to significantly affect the sensitivity of gold nanoparticle probe. With the colorimetric probe, we developed a protocol for naked eye speciation test of As III and As V at levels below the World Health Organization (WHO) guideline of 10 μg L −1 . This method featured with high tolerance to common coexisting ions such as 10 mM PO 4 3− , and was validated by assaying certified reference and environmental water samples. KEYWORDS: arsenic, ionic liquid, interaction, gold nanoparticle, Hofmeister effect, visual test ■ INTRODUCTIONArsenic shows various adverse health effects including carcinogenic disease relative to skin, lung, and kidney. 1−3 More than 140 million people worldwide are exposed to superfluous arsenic, mainly by drinking ground waters polluted by inorganic arsenic that are more toxic than the organic ones. 4,5 Although As III and As V are coexisting and undergo mutual transformation in groundwater, As III is usually the main form and more toxic than As V . 6 Consequently, monitoring of inorganic arsenic species in waters is of prior interest in arsenic detection. Numerous instrumental methods have been developed to quantify trace arsenic, 7−10 but the requirement of bulk equipment and strict laboratory conditions restricts their application in field analysis. On the contrary, the colorimetric or visual methods are quite suitable for field determination. Because of their poor sensitivity, however, traditional visual probes are incapable of detecting As III and As V at 10 μg L −1 level, which is the arsenic guideline value in drinking water required by the World Health Organization (WHO) and U.S. Environmental Protection Agency (EPA). Additionally, the fairly poor tolerance to interferences of these probes restricts their application in real sample analysis. 11−13 Several arsenic testing field kits are able to semiquantify 10 or 50 μg L −1 As, but most of them fail to meet the requirements of an ideal test kit for As. 14−16 Gold nanoparticles (AuNPs) are widely used as optical probes in colorimetric detection in recent years, 17−19 because of their higher extinction coefficient in the visible region and thus higher sensitivity in comparison to the organic probes. Since the pioneering work of the Mirkin group, 20 AuNPs have served as optical probes for sensing cations, anions, small organic compounds, and biological molecules, 21−23 with Hg 2+ as one of the most attractive target analytes. 24−31 Surprisingly, studies on the u...

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Colorimetric Au Nanoparticle Probe for Speciation Test of Arsenite and Arsenate Inspired by Selective Interaction between Phosphonium Ionic Liquid and Arsenite

Tan

Liu

Yin

et al. 2014

ACS Appl. Mater. Interfaces

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“…Citrate-capped AuNPs of ~30 nm in diameter were synthesized according to documented protocols, [32][33][34] as briefly described as follows: 3 mL of sodium citrate (1% w/w) was added rapidly under vigorous stirring in a 100 mL boiling solution of HAuCl4 (0.02% w/w, 99.99% purity). Within several minutes, the solution color changed to wine red.…”

Section: Synthesis Of Aunpsmentioning

confidence: 99%

A Cytosine-rich DNA Decorated Gold Nanoparticles Surface Enhanced Raman-Scattering Platform for Sensitive and Selective Detection of Silver Ions

et al. 2013

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In this work, we developed a label-free, homogeneous surface-enhanced Raman-scattering (SERS) platform for the rapid, simple and sensitive detection of Ag + by using the unmodified gold nanoparticles (AuNPs). It utilizes the different absorption properties of single-strand DNA (ssDNA) and double-strand DNA (dsDNA) on citrate-coated AuNPs and specific interactions between Ag + and cytosine-cytosine pairs. In the presence of Ag + , the structure of ssDNA containing rich cytosine will form a duplex, resulting in the salt-induced aggregation of gold nanoparticles; the corresponding SERS signal transduction can be observed due to the plasmonic coupling of metallic nanoparticles. The assay possesses a superior signal-to-background ratio as high as ~35.8 with a detection limit of 15 nM. This approach is not only rapid and convenient in operation, but also shows excellent selectivity, which makes it possible to detect Ag + in actual samples.

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“…The color changes associated with NP aggregation, and/or local refractive index change, have been exploited as optical sensing methods for the detection of toxins , Liu et al 2008, Shim et al 2009 ), heavy metals (Darbha et al 2008, Xue et al 2008 ) and other environmental pollutants (Daniel et al 2009, Dasary et al 2009 ) in water, soil and other environmental samples. AuNPs are also being used to enhance the performance of electrochemical sensors due to their catalytic properties (Rassaei et al 2011 ).…”

Section: Application Of Aunps In Detection Of Chemical Pollutants In mentioning

confidence: 99%

Detection of chemical pollutants in water using gold nanoparticles as sensors: a review

Wang

2012

Reviews in Analytical Chemistry

144

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Rapid and accurate evaluation of pollutant contamination in water is one of the key tasks of environmental monitoring. To make onsite assessment feasible, the analytical tools should be easy to operate, with minimal sample preparation needs. Gold nanoparticle (AuNP)-based sensors have the potential to detect toxins, heavy metals, and inorganic and organic pollutants in water rapidly with high sensitivity, and they are expected to play an increasingly important role in environmental monitoring. In this article, the synthesis, fabrication and functionalization of AuNPs are discussed, and the recent advances in the development and application of AuNP-based sensors for the determination of various pollutants contamination in water are reviewed.

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Selective Detection of Mercury (II) Ion Using Nonlinear Optical Properties of Gold Nanoparticles

Cited by 425 publications

References 29 publications

Colorimetric Au Nanoparticle Probe for Speciation Test of Arsenite and Arsenate Inspired by Selective Interaction between Phosphonium Ionic Liquid and Arsenite

Colorimetric Au Nanoparticle Probe for Speciation Test of Arsenite and Arsenate Inspired by Selective Interaction between Phosphonium Ionic Liquid and Arsenite

A Cytosine-rich DNA Decorated Gold Nanoparticles Surface Enhanced Raman-Scattering Platform for Sensitive and Selective Detection of Silver Ions

Detection of chemical pollutants in water using gold nanoparticles as sensors: a review

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