Ag nanoparticles decorated into metal-organic framework (Ag NPs/ZIF-8) for electrochemical sensing of chloride ion

Abstract

In this work, silver nanoparticles (Ag NPs) were decorated into the cavities of ZIF-8 to fabricate a novel Ag NPs/ZIF-8 modified glassy carbon electrode (GCE) for electrochemical sensing of chloride ion. Benefiting from the synergistic properties of ZIF-8 and Ag NPs, the Ag NPs/ZIF-8/GCE showed favorable performance towards chloride ion. For comparison, the electrochemical activity of Ag NPs wrapped by ZIF-8 (Ag NPs@ZIF-8) and Ag NPs coating on ZIF-8 (Ag NPs-on-ZIF-8) were also investigated and it was found that Ag NPs/ZIF-8 possessed the best performance. Some experimental parameters including pH of the supporting electrolyte and scan rate were also investigated. Under optimal conditions, the proposed sensor exhibited excellent stability, reproducibility and selectivity for the determination of chloride ion with a wide linear detection range from 5 to 4000 μmol dm −3 and a low detection limit of 0.61 μmol dm −3 (S/N=3). The proposed sensor was successfully applied to the determination of chloride ion spiked in human serum. All these results indicated that the developed Ag NPs/ZIF-8/GCE sensor was superior.

Pore-Confined Silver Nanoparticles in a Porphyrinic Metal–Organic Framework for Electrochemical Nitrite Detection

“…Because of their relatively strong node-to-linker bonds, rigid framework structures, and regular pore size in the range of a few nanometers, Zr-MOFs have been reported as the porous supports to generate pore-confined metal NPs without further agglomeration. − As mentioned previously that silver can be served as the active electrocatalyst for electrochemical nitrite detection, we reasoned that Ag NPs confined in the nanopores of a water-stable Zr-MOF should be an attractive candidate for nitrite sensors. A few recently published studies have reported the synthesis of composite materials composed of Zr-MOFs and Ag NPs. − The use of Ag NPs incorporated in iron-, copper-, or zinc-based MOFs for electrochemical sensors has also been reported very recently. − However, all the reported Ag NP–MOF composite materials have not been applied for electrochemical nitrite detection.…”

Novel transdermal patch for detecting Cystic fibrosis

“…This innovative sticker technology and the emergence of new wearable gadgets and sensors give them hope. [3][4][5][6][7][8][9][10]…”

“…[1][2][3][4][5] Although there are schemes for rapid diagnosis, however, smart, and non-invasive techniques are very few. [5][6][7][8][9][10][11][12][13] This short communication deals with a smart sticker which can detect CF at an early stage.…”

A {Zn4} cluster as a bi-functional luminescence sensor for highly sensitive detection of chloride ions and histidine in aqueous media

“…As an important anion, chloride ions (Cl À ) can be found almost everywhere in environmental water because it is used in many disinfectants, pesticides and production processes. [1][2][3] However, the accumulation of Cl À in manufacturing is prone to inducing polarization reactions which can lead to the acceleration of equipment corrosion. Also, if there is excessive Cl À in agricultural water, it will lead to soil salinization and acidification, thus affecting the growth of crops.…”