A facile label-free colorimetric sensor for Hg2+ based on Hg-triangular silver nanoplates with amalgam-like structure

Chen, Zhengbo; Lou, Tianhong; Wu, Qian; Li, Kai; Tan, Lulu; Sun, Jingyan

doi:10.1016/j.snb.2015.06.082

Cited by 27 publications

(7 citation statements)

References 28 publications

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“…Thus, we presented herein a novel strategy for preparing a novel group of QAgNPs with lamellar structures using derivatized native amylopectin as substrates. Such large QAgNPs are of great interest for diverse potential applications, such as catalysis, antibacterial surface, and sensing. ,− It should be noted that the aggregation formed within the binary system greatly hinders the exploration of further potential applications. Several methods including washing via solvent exchange, ligand exchange, and acid hydrolysis were not successful to remove the aggregation of APUE 3 -MPA, whereas further study is required to effectively separate QAgNPs from polymer matrix.…”

Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

et al. 2018

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Polymers or small molecules with functional groups were always employed to synthesize two-dimensional (2D) silver nanostructures, but the polysaccharides and derivatives have rarely been used for their preparation, let alone of uniform quadrilateral shapes. Herein, amylopectin derivatives containing concentrated carboxyl groups were first used for the synthesis of uniform 2D quadrilateral silver nanoplates (QAgNPs) with lamellar structure. As a native hyperbranched polysaccharide, amylopectin was esterified with 10-undecenoyl chloride and then modified via thiol–ene click chemistry to introduce high amount and high density of carboxyl groups. Then, QAgNPs were synthesized via UV photoreduction in the presence of the resultant amylopectin 11-((3-carboxyl)ethylthio)undecanoate (APUE 3 -MPA) in water–tetrahydrofuran binary system. QAgNPs showed novel uniform quadrilateral shapes with lamellar structure, as verified by their wide-angle X-ray scattering patterns. The average interlayer distance was around 1.3 nm, whereas the average edge lengths of QAgNPs varied between 0.29 ± 0.07 and 1.09 ± 0.25 μm. The concentration of APUE 3 -MPA and the amount of water in the reaction system strongly affected the shapes of QAgNPs. Thus, the reaction system and the arrangement of numerous carboxyl groups were the key factors for the formation of lamellar-structured QAgNPs.

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Section: Resultsmentioning

confidence: 99%

One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

et al. 2018

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“…53,54 According to previous studies, the lower energy (111) planes of triangular and hexagonal Au NPs are more prone towards incoming moieties. [55][56][57] Therefore, it is reasonable to say that Hg 0 will adsorb preferentially on the (111) planes of Au NPs. Elevated adsorption of Hg 0 can be expected when the percentage of triangular shape particles is on the higher side.…”

Section: Chemo-sensing Aspectmentioning

confidence: 99%

Eicosyl ammoniums elicited thermal reduction alleyway towards gold nanoparticles and their chemo-sensor aptitude

Rana

Jamwal

Katoch

et al. 2016

Analyst

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The construction of dimethylenebis(eicosyldimethylammonium bromide) surfactant-directed gold nanoparticles (NPs) has been accomplished via a one-pot thermal reduction of HAuCl4 with trisodium citrate. The effect of cationic twin-tail surfactants, dimethylenebis(hexadecyldimethylammonium bromide) (16-2-16), dimethylenebis(octadecyldimethylammonium bromide) (18-2-18) and dimethylenebis(eicosyldimethylammonium bromide) (20-2-20), and their concentrations on shape and size of Au nanoparticles was thoroughly investigated. The UV-Vis spectroscopy and transmission electron microscopy (TEM) results show that longer tail length surfactants act as shape-directing agents promoting diversified morphologies. The formation of multiple-shaped Au nanoparticles, such as round, hexagonal, pentagonal, triangular and rod-like, has been confirmed from microstructure analysis; among them, many triangular shapes enhanced at elevated levels of surfactant concentration. In addition, the triangular Au nanoparticles with truncated corners were changed to smooth corners as the hydrocarbon chain length increased from (18-2-18) to (20-2-20). The concentration and hydrocarbon tails of twin-tail surfactants strongly influence the size and structure of Au NPs. In addition, the Au NPs synthesized with the twin-tail surfactant (18-2-18) were found to be highly sensitive towards Hg(2+), which could be because of the preferential adsorption of Hg(0) on the lower energy facets of triangular-shaped Au NPs.

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“…Understanding the mechanism during the colorimetric sensing of analytes with nanoparticles has been achieved using various characterization techniques such as UV–vis spectroscopy, dynamic light scattering, and transmission electron microscopy (TEM). ,,, Here, we proposed the use of single-particle inductively coupled plasma mass spectrometry (SP-ICP-MS) to get additional information on changes in nanoparticles during the colorimetric sensing of analytes. With SP-ICP-MS, not only is information on equivalent spherical diameter obtained, but we can also obtain information on the number of particles and dissolved ion concentration in a single run. − Although TEM can provide information on size and shape, the technique is limited by the number of nanoparticles within the field of view .…”

Section: Introductionmentioning

confidence: 99%

Tracking Silver Nanoparticles during Their Synthesis by Inductively Coupled Plasma Mass Spectrometry: Implications for Colorimetric Sensing of Mercury Ions

Ilmiah

Sumranjit

Wutikhun

et al. 2023

ACS Appl. Nano Mater.

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Silver nanoplates have been used in the colorimetric sensing of analytes through various mechanisms. Herein, we proposed the use of single-particle inductively coupled plasma mass spectrometry (SP-ICP-MS) for providing additional information on changes in nanoparticles during the colorimetric sensing of analytes. The information on equivalent spherical diameter and the number of particles obtained from SP-ICP-MS was employed for tracking the changes in silver nanoparticles during their synthesis process under various synthesis conditions and also during the colorimetric sensing of mercury. By comparing the edge size of triangular nanoplates observed by transmission electron microscopy, the information on the plate thickness of triangular silver nanoplates was also estimated by the size information from SP-ICP-MS. Four types of silver nanoplates were examined including bare silver nanoplates, silver nanoplates capped with glutathione, silver nanoplates capped with glutathione mixed with 0.05 mg L–1 mercury and bromide ions, and silver nanoplates capped with glutathione mixed with 1 mg L–1 mercury and bromide ions. The information on equivalent spherical diameter and the number of particles was used for understanding the sensing mechanism of the silver nanoplates toward mercury ions. The information from SP-ICP-MS was combinedly used with plasmon absorption data, as well as the information from field-flow fractionation-ICP-MS (FFF-ICP-MS), in order to study the changes in silver nanoparticles at various concentrations of mercury ions. A linear increase in particle concentrations was observed by SP-ICP-MS for the concentration range of 0.001–0.01 mg L–1 mercury ions. The particle concentrations were highest at 0.01 mg L–1 mercury ions and decreased to the same numbers as for the bare silver nanoplates without bromide etching. This study shows the potential use of SP-ICP-MS to provide additional information for tracking silver nanoparticles during their synthesis and colorimetric sensing of mercury ions. In addition, for SP-ICP-MS analysis of particle concentrations for the diluted silver nanoplates in contact with mercury ions before etching with diluted bromide ions, the limit of detection for mercury was pushed down to approximately 0.01 μg L–1, which would be very useful for the analysis of real samples under environmentally relevant conditions.

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A facile label-free colorimetric sensor for Hg2+ based on Hg-triangular silver nanoplates with amalgam-like structure

Cited by 27 publications

References 28 publications

One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

One-Step Synthesis of Quadrilateral-Shaped Silver Nanoplates with Lamellar Structures Tuned by Amylopectin Derivatives

Eicosyl ammoniums elicited thermal reduction alleyway towards gold nanoparticles and their chemo-sensor aptitude

Tracking Silver Nanoparticles during Their Synthesis by Inductively Coupled Plasma Mass Spectrometry: Implications for Colorimetric Sensing of Mercury Ions

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