NiS Nanospheres Anchored onto a Graphene Oxide Substrate (NiS@GO) for Efficient Electrochemical Sensing of Trace Amounts of Silver Ions

Abstract

Electrochemical analysis is a promising method among all the common analytical technologies reported, due to its considerable sensitivity, inherent portability and low-cost requirements. To accurately monitor the contamination of heavy metal Ag + , NiS nanospheres anchored onto graphene oxide substrate (NiS@GO) were successfully constructed as a electrochemical sensor, by one-pot precipitation-co-self-assembly method. Under the optimized conditions, the obtained NiS@GO ex-hibited a synergistic electrochemical performance for exclusive cyclic-voltammetry sensing of ultra-trace Ag + with a nice linear range of 6.67-160 × 10 À 9 mol/L and a low detection limit of 1.76 × 10 À 10 mol/L. When applied for electrochemical detection of Ag + in real environmental water and fruit juice samples, the recoveries were between 95.8 and 102.4 % with relative standard deviations less than 3.4 %. The recognition mechanism for NiS@GO to Ag + was illustrated in detail.

Highly sensitive and specific detection of silver ions using a dual-color fluorescence co-localization strategy

“…[9][10][11][12][13][14][15][16][17][18][19][20] However, these methods commonly suffer from disadvantages including the limited sensitivity, expensive equipment and complicated operating steps. 21,22 It has been reported that Ag + ions are able to selectively coordinate cytosine (C) bases and form a stable cytosine-Ag + -cytosine (C-Ag + -C) complex. 23 Various biosensors based on the interaction of the C-Ag + -C mismatch structure have been developed.…”

Controllable synthesis of Pt nanoparticles on graphene oxide nanosheets and its application for electrochemical determination of dopamine

“…In addition, GO as a promising supporting material has been popularly used in electrochemical sensor field due to its large specific surface area, unique electronic properties and conductivity. [16][17][18][19] GO not only disperses and stabilizes inorganic nanoparticles but also provides fertile opportunities for the adsorption of molecules, which facilitates the construction of efficient sensors. Dopamine (DA) [20][21] is one of the familiar neurotransmitter that is used to transfer information in the central nervous system.…”

“…Diverse oxygen‐containing functional groups were linked to the carbon atoms, including carboxylic, hydroxyl and epoxide, which enhanced its solubility and stability. In addition, GO as a promising supporting material has been popularly used in electrochemical sensor field due to its large specific surface area, unique electronic properties and conductivity [16–19] . GO not only disperses and stabilizes inorganic nanoparticles but also provides fertile opportunities for the adsorption of molecules, which facilitates the construction of efficient sensors.…”