Fluorometric sensing of ultralow As(iii) concentrations using Ag doped hollow CdS/ZnS bi-layer nanoparticles

Abstract

Arsenic poisoning from drinking water has been an important global issue in recent years. Because of the high level toxicity of arsenic to human health, an easy, inexpensive, low level and highly selective detection technique is of great importance to take any early precautions. This study reports the synthesis of Ag doped hollow CdS/ZnS bi-layer (Ag-h-CdS/ZnS) nanoparticles for the easy fluorometric determination of As(iii) ions in the aqueous phase. The hollow bi-layer structures were synthesized by a sacrificial core method using AgBr as the sacrificial core and the core was removed by dissolution in an ammonium hydroxide solution. The synthesized nanoparticles were characterized using different instrumental techniques. A good linear relationship was obtained between fluorescence quenching intensity and As(iii) concentration in the range of 0.75-22.5 μg L(-1) at neutral pH with a limit of detection as low as 0.226 μg L(-1).

Design of Fluorescence-Enhanced Silver Nanoisland Chips for High-Throughput and Rapid Arsenite Assay

“… 36 In addition, the carboxylate form of Cy7.5 dye and PAA is favorable under alkaline conditions. The stable hydroxo complexes of As(III) can undergo the ligand exchange reaction in the presence of carboxylates, 31 , 34 , 35 resulting in the conjugation of As(III) with Cy7.5 fluorescent dye and PAA on the pAg chips. However, when the pH value was higher than 12, the pAg chips may be damaged under such high pH conditions, resulting in the detachment of Ag-NIFs from the glass substrates.…”

“…As the previous studies have demonstrated that As­(III) can induce the aggregation of carboxylic acid-functionalized Au nanoparticles through the As–O linkages, ,, in this work, a fluorescence-enhanced As­(III) assay (Figure b) was designed by using the poly­(acrylic acid) (PAA) modified chips to capture As­(III) ions, followed by outputting the fluorescent signals through the conjugated Cy7.5 carboxylic acid dyes. Because PAA has a carboxyl group (−COOH) on each monomer unit, the polymer can directly cap the surface of Ag because of the carboxyl-rich property.…”

Yellow Fluorescent Carbon Dots for Selective Recognition of As3+ and Fe3+ Ions

“…25 Cysteine-functionalized Ag-doped CdS/ZnS bilayer nanoparticles have been utilized for As 3+ ion detection via the interaction between the carboxyl groups of cysteine and As 3+ . 26 A fluorescent chemical probe, namely, ArsenoFluor1, has been applied for fluorescence "turn-on" detection of As 3+ in organic solvents. 27 Cysteine-fused tetraphenylethene has been employed as an aggregationinduced emissive probe for As 3+ detection.…”

“…Glutathione-capped CdTe quantum dots have been used to detect As 3+ ions through the fluorescence quenching technique . Cysteine-functionalized Ag-doped CdS/ZnS bilayer nanoparticles have been utilized for As 3+ ion detection via the interaction between the carboxyl groups of cysteine and As 3+ . A fluorescent chemical probe, namely, ArsenoFluor1, has been applied for fluorescence “turn-on” detection of As 3+ in organic solvents .…”

Cost Effective Purification of Tannery Waste Water Using Biosynthesized Silver Nanoparticles

“…Nano chemistry is a becoming apparent sub-discipline of chemical and materials sciences. These materials have been explored in many different applications, including uses in electronics, nano appliances, biotechnology, and medicine, and also in the textile industry [5][6] . Silver nanoparticles are the most appealing and demandable exploration in the field of nanotechnology [7][8][9] .…”